Residual hardness °dH
Residual hardness measurement in water treatment for demineralised process water
Water hardness is a measure of the content of calcium and magnesium ions in water. Water hardness is usually measured in German degrees of hardness (°dH).
High water hardness can lead to limescale deposits forming in pipes, appliances and household devices such as kettles, washing machines and coffee machines. It can also cause detergents and soaps to be less effective as they react with the calcium and magnesium ions in the water.
On the other hand, too low a water hardness (soft water) can also be problematic as it can cause the water to become more corrosive and wear out metals and pipes more quickly.
Residual hardness monitoring in hospitals and clinics
Residual hardness monitoring in the reprocessing of medical devices in clinics is crucial to ensure the efficiency of cleaning and disinfection processes. By measuring residual hardness using a water hardness measuring device, deposits can be reduced and the service life of devices and medical products can be extended. Water hardness measurement therefore also plays an important role in process water treatment
Filter products
Duroval TI Test Kit 0-30 °dH from Heyl – Industrial Water Hardness Analysis Titration test kit for determining total water hardness The Duroval TI Test Kit 0-30 °dH is an analysis set for precise determination of total water hardness in water samples via complexometric titration. The TI test kit provides fast and reliable results in the range of 0 to 30 °dH. In approximately 2 minutes, users receive meaningful measurements with an accuracy of 0.5 °dH. Contents of the test kit: Measuring tube Indicator Calibrated dosing pipette 0–30 °dH 30 ml titration solution Reliable Total Hardness Determination via Complexometric Titration The Duroval TI Test Kit 0–30 °dH is a professional analysis set from Heyl for precise determination of total water hardness in industrial and commercial applications. The proven complexometric titration method ensures accurate analysis of raw, process, and operational water across a wide measurement range. The test kit delivers fast and reproducible results. Within approximately 2 minutes, users obtain meaningful measurements with an accuracy of 0.5 °dH, making it ideal for routine checks and commissioning. Advantages of the Duroval TI Test Kit for Industrial Applications The Duroval TI Test Kit stands out due to its simple handling and high measurement reliability. The calibrated dosing pipette ensures precise addition of the titration solution, while the clear color change of the indicator enables accurate evaluation. The compact set is especially suitable for mobile measurements, service tasks, and regular checks in industrial water treatment. It provides a precise manual alternative to automated measurement systems and supports efficient quality and process monitoring. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.
Testomat 2000 – Online Analysis Device for Water Hardness and Other Parameters Continuous water quality monitoring with automatic titration and flexible parameter selection The Testomat 2000 is a versatile analysis device for the continuous determination of key water quality parameters such as water hardness, carbonate hardness, p-value, and minus m-value. The process photometer operates fully automatically with a precise piston dosing pump and plain-text menu display, allowing measurement, analysis, and control without manual intervention. Individually selectable indicators enable different parameters and measurement ranges, while internal limit contacts ensure reliable monitoring and alarm functions. Depending on the selected indicator, the device measures residual hardness, total hardness, carbonate hardness, p-value, or minus m-value fully automatically via precise titration. Two independently programmable limit contacts support automatic control and alarm functions, while external control options such as range-dependent measurement triggering or versions with SD card data logger are available for documentation and process analysis. What functions does the Testomat 2000 from Heyl offer? It combines modern measurement principles with practical control and evaluation functions. By selecting different indicator types, it can be used in a wide variety of applications. Two freely programmable limit values with adjustable hysteresis support monitoring tasks, and optional interfaces expand the device for complete data recording or integration with control systems. Applications for the Testomat 2000 Hardness Monitoring water quality in water treatment, blending, and drinking water systems Monitoring and quality control of softening systems with or without blending Monitoring and quality assurance of decarbonization systems Prevention of acid intrusion in decarbonization systems Boiler monitoring of steam boilers Performance Profile of the Testomat 2000 Simple, menu-guided operation and programming via plain-text display Measurement of residual hardness, total hardness, carbonate hardness, minus m-value, or p-value selectable via indicator choice Free choice of hardness units: °dH, °f, ppm CaCO3, or mmol/l High measurement accuracy due to precise piston dosing pump Analysis triggering: Automatic interval operation (interval pause adjustable from 0–99 minutes) External triggering Dynamic (exhaustion-dependent interval operation) Quantity-dependent via contact water meter Two independent limit values with hysteresis (1, 2, or 3 bad analyses) and adjustable switching functions Monitoring of two measuring points (switching via external solenoid valves) Internal error documentation Programmable service address Indicator volumes: 100 and 500 ml bottles Programmable maintenance interval for maintenance requests
Testomat 808: Continuous Hardness Limit Monitoring Online measurement of residual water hardness with automatic color change Measurement Principle and Technical Features Modern indicator pump system supporting an automated process with minimal reagent and water consumption. Internal and external flushing options, manual safety check for up to 72 hours of unattended operation (BOB operation), and interfaces for 4–20 mA signals and RS232 firmware updates. Purchase Benefits 3% shop discount when purchasing a Testomat 808 Free of charge: original Heyl indicator for hardness measurement Frequently asked questions How long is the warranty for Testomat devices? The manufacturer's warranty period for the Testomat device series from Heyl is two years from the date of delivery. Where can I view or download the operating instructions? The operating instructions are included with the Testomat upon delivery and can be downloaded at any time from our online shop (www.heylneomeris.de) under the menu item – Service/Help – Download Operating Instructions. Can the warranty be extended? A warranty extension to three years is possible for a newly purchased device if a subscription for the corresponding indicator delivery is taken out. The subscription can be taken out easily and conveniently in the customer account under Subscriptions. The device warranty is extended from 24 months to 36 months after taking out the subscription. The prerequisite for this is that the subscription is taken out within 3 months of the purchase date. A subsequent warranty extension is not possible. Does the Testomat 808 have different spare parts and service sets to the Testomat 808 SiO2? Yes, there are some differences. More detailed information on the individual parts can be found in the operating instructions under ‘Spare Parts List’. How high are the follow-up costs for chemicals? The necessary use of indicators depends on the measurement intervals, which can be set via the device. The actual chemical consumption can be determined independently and individually for the respective application using our indicator or reagent consumption calculator in the shop. Indicators consumption calculator Reagent Consumption Calculator How often does the Testomat 808 need to be serviced? According to the manufacturer, regular maintenance is recommended. The recommended maintenance interval is between 6 and 12 months. Can the device be serviced by a service partner? With our nationwide service partner network, we can arrange for maintenance to be carried out by one of our service partners in Germany and Austria at any time. Please send us your enquiry to vertrieb@heylneomeris.de. Can the device be sent in for repair (cost estimate)? Of course, we at HeylNeomeris offer a repair service. To do this, we need the completed checklist from the operating instructions. The maintenance request can be sent to vertrieb@heylneomeris.de. If you have any further questions, please contact our service team on the service hotline +49 (0) 5121 7609 99.
The Testomat® 808 is a compact analyser for online measurement of water hardness according to the principle of "limit value monitoring with colour change" in the measuring range 0.02 - 5 ° dH (0.4 - 89 ppm). Applications of the continuous residual hardness monitoring are e.g.: Reverse osmosis systems, boiler feed water supply Soft water for commercial purposes, ultrapure water systems. In view of the fact that the Testomat® 808 is suitable for use in multi-parameter systems due to its 4-20mA signal output, we hereby offer you the Testomat® 808 in conjunction with the NeoTecMaster® Multicontroller, which was specially developed by our company, as a package solution at a preferential price. The 4-channel NeoTecMaster® Multicontroller included in this package enables the processing of up to four measurement signals. Via the 4-20mA NeoTec slave input module connected to the NeoTecMaster®, the data is transmitted to the NeoTecMaster® and used to display the measured value, the trend and the status messages on the 5-inch screen. In addition, the NeoTecMaster® has an RS232 interface as well as a Modbus RTU input, which you can use freely after brief technical consultation with us. (Pre-check whether your existing measurement technology to be integrated requires adjustments). The NeoTecMaster® can be systematically supplemented with further optional NeoTec modules (function / signal converter modules) as required. This allows the future realisation of further control concepts in a flexible way. Two modules which fundamentally extend the range of functions and are already included in the scope of delivery are our NeoTec slave relay module and the 4x 4-20mA input module. This allows you to add potential-free relay contacts to the overall system and to integrate and visualise further system technology such as sensors via the 4x 4-20mA input module. You can freely assign the relay contacts to the incoming measurement signals and thus, for example, implement simple limit value-related control concepts as well as output measurement value-related messages. Further advantages of the NeoTecMaster: Simple operation Integration of the Testomat® device world, here in connection with the Testomat® 808 Integration into the existing control cabinet, alternatively we offer our NeoTecMaster® enclosure Modular range of functions can be extended by NeoTec slave and signal converter modules (measurement, control, regulation) Available as built-in or surface-mounted variant Structured continuous data recording on the integrated SD card or optionally available SDHC card (2Gbyte) as a file in CSV format In addition, there are the proven functionalities of the Testomat® 808: Indication of limit value undershoot or overshoot: green / red LED Modern indicator pump system Automatic measuring sequence with low water consumption Direct error and indicator quantity display Internal and external flushing of the measuring chamber by manual control Control of an external flush valve Three potential-free relays for: External flush valve control Limit value evaluation External control and / or alarm processing Safety check for 72-hour operation without supervision Indicator quantities: 100 and 500 ml bottles 4 - 20 mA interface for defined status and error messages RS 232 interface for firmware updates General information Water connection and operating pressure: Depending on unit version: 0.3 - 1 bar / 0.3 x 105 to 4 x 105 Pa 1 - 4 bar / 1 x 105 to 4 x 105 Pa (from 4 to 8 bar, a pressure reducer must be used (special accessory)) Water inlet: opaque hose with 6 mm outer diameter/4 mm inner diameter Water outlet: hose with 6 mm outer diameter/4 mm inner diameter Water temperature: 10 to 40 °C From 4 bar, a separately available pressure reducer must be used. Please use only the indicators approved for Testomat® 808! Optional accessories: NeoTecMaster unit hood
Precise Water Hardness Analysis for Automated Process and System Monitoring with the Testomat EVO TH Fully automatic water hardness determination via titration The Testomat EVO automatically detects the water level when filling the measuring chamber and can also operate for extended periods in BOB mode without constant supervision. With an integrated SD card or optionally an SDHC card (2 GB), measurement data and messages/alarms can be recorded. The menu is available in multiple languages, and firmware updates can be conveniently applied via the SD card. Analog outputs and serial interfaces allow external processing of measurement data. Certified and Cost-Effective Standalone Water Hardness Meter With the Testomat EVO, you benefit from stable, low-maintenance continuous operation, minimal consumption of indicator solution and water, as well as versatile data communication via RS232 or 0/4–20 mA signals. Certification according to relevant safety and TÜV standards (WÜH certification for boiler houses) and the compact design make the EVO a robust and efficient solution for demanding measurement tasks. Applications for the Testomat EVO Water treatment Drinking water systems Industrial boilers Process water monitoring When purchasing the Testomat EVO online, you receive, in addition to a 3 % online discount on Heyl devices, a free indicator of your choice. Frequently asked questions How long is the warranty period for the Testomat EVO TH? The warranty period for the Testomat EVO TH series is 2 years from delivery. Where can I view or download the operating instructions? The operating instructions can be viewed or downloaded in the online shop, either directly with the item or in a separate download area. How can the values be read out on the Testomat EVO TH? This is possible with the integrated SD card. More detailed information on data readout can be found in the operating instructions. Can the warranty on my Testomat device be extended? A warranty extension on a newly purchased Testomat device is generally possible from 24 to 36 months. The warranty period can thus be extended by one year. The prerequisite for this is that the extension is made within the first three months after the date of purchase. You can access the device warranty extension directly via your online shop customer account. Does the Testomat EVO TH have different spare parts and service sets than the Testomat ECO? No, the spare parts for the Testomat EVO TH and the Testomat ECO are identical. A selection of spare parts for the specific device can also be found in the respective device operating instructions. How high are the follow-up costs for chemicals? Chemical consumption depends on the number of analyses performed with the Testomat EVO TH. Consumption can be determined using our indicator consumption calculator in the online shop. How often does the device need to be serviced? The manufacturer recommends servicing the device once or twice a year. The maintenance interval for the Testomat EVO TH is therefore 6-12 months. Can the device be serviced by a service partner? Yes, maintenance can be carried out by an authorised Heyl Neomeris service partner. Please feel free to contact us if required via vertrieb@heylneomeris.de , so that we can find the right technician for your region. Can the device be sent in for repair (cost estimate)? Yes, the defective device can be sent to our address. A description of the fault should be included with the return shipment and the indicator must be removed from the device before returning it. Once we have received the defective device, you will first receive a cost estimate for the expected repair costs. The repair will only be carried out after prior approval.
The Testomat LAB TH and the Testomat LAB TH-R (Remote) are fully automatic online analyzers for the precise determination of residual total hardness in water using automated titration. The device provides continuous, reliable measurement results in the range of 0.05–25 °dH. The instruments were developed for use in multiparameter systems and for connection to higher-level control systems. Fully automatic residual hardness measurement for laboratory and process water using Testomat LAB High-precision titrimetric hardness determination with data logging The Testomat LAB TH combines high measurement accuracy with easy integration into existing measurement and automation concepts. Automatic titration using a piston dosing pump enables continuous, low-maintenance acquisition of water hardness values. All measurement data are logged in a structured format on an integrated SD card or optionally on an SDHC card. The standard interfaces 4–20 mA and RS232 allow direct data transfer to higher-level control and process control systems. Application areas of the Testomat LAB TH and LAB TH-R (Remote) Flexible use in laboratory, process, and drinking water monitoring Water treatment plants Drinking water systems Industrial boilers Process water monitoring Technical highlights and performance features of the Testomat LAB TH The Testomat LAB TH features optical water detection during filling of the measuring chamber, automatic venting of the indicator line, and an integrated self-test for continuous system monitoring. Benefits of hardness measurement within the LAB multiparameter system Thanks to the integration capabilities of the Testomat LAB in a manufacturer-independent multiparameter system, precise and continuous online monitoring of water hardness is possible within a central measurement platform. Automatic titrimetric measurement delivers reliable and reproducible results and can be easily integrated into existing process and control systems via standardized interfaces. This increases process reliability and reduces maintenance and personnel costs. Frequently asked questions How long is the warranty period? The warranty period is 2 years from delivery. Where can I view or download the operating instructions? The operating instructions can be viewed or downloaded in the online shop, either directly with the item or in a separate download area. Can I extend the warranty on my Testomat device? It is possible to extend the warranty on a newly purchased Testomat device. The same applies to devices for which the initial warranty has not yet expired. The warranty period can be extended by one year. You can extend the device warranty directly via your online shop customer account. How high are the follow-up costs for chemicals? Chemical consumption depends on the number of analyses. Consumption can be determined using our indicator consumption calculator in the online shop. How often does the device need to be serviced? The manufacturer recommends servicing the device once or twice a year (i.e. every 6-12 months). Can the device be serviced by a service partner? Yes, maintenance can be carried out by an authorised Heyl Neomeris service partner. Please feel free to contact us if required via vertrieb@heylneomeris.de , so that we can find the right technician for your area. Can the device be sent in for repair (cost estimate)? Yes, the defective device can be sent to our address. When returning the device, please include a description of the fault and remove the indicator from the device before sending it back. Once we have received the defective device, you will first receive a cost estimate for the expected repair costs. The repair will only be carried out by us after you have given your prior approval.
The Testomat LAB TH and the Testomat LAB TH-R (Remote) are fully automatic online analyzers for the precise determination of residual total hardness in water using automated titration. The device provides continuous, reliable measurement results in the range of 0.05–25 °dH. The instruments were developed for use in multiparameter systems and for connection to higher-level control systems. Fully automatic residual hardness measurement for laboratory and process water using Testomat LAB High-precision titrimetric hardness determination with data logging The Testomat LAB TH combines high measurement accuracy with easy integration into existing measurement and automation concepts. Automatic titration using a piston dosing pump enables continuous, low-maintenance acquisition of water hardness values. All measurement data are logged in a structured format on an integrated SD card or optionally on an SDHC card. The standard interfaces 4–20 mA and RS232 allow direct data transfer to higher-level control and process control systems. Application areas of the Testomat LAB TH and LAB TH-R (Remote) Flexible use in laboratory, process, and drinking water monitoring Water treatment plants Drinking water systems Industrial boilers Process water monitoring Technical highlights and performance features of the Testomat LAB TH The Testomat LAB TH features optical water detection during filling of the measuring chamber, automatic venting of the indicator line, and an integrated self-test for continuous system monitoring. Benefits of hardness measurement within the LAB multiparameter system Thanks to the integration capabilities of the Testomat LAB in a manufacturer-independent multiparameter system, precise and continuous online monitoring of water hardness is possible within a central measurement platform. Automatic titrimetric measurement delivers reliable and reproducible results and can be easily integrated into existing process and control systems via standardized interfaces. This increases process reliability and reduces maintenance and personnel costs. Frequently asked questions How long is the warranty period? The warranty period is 2 years from delivery. Where can I view or download the operating instructions? The operating instructions can be viewed or downloaded in the online shop, either directly with the item or in a separate download area. Can I extend the warranty on my Testomat device? It is possible to extend the warranty on a newly purchased Testomat device. The same applies to devices for which the initial warranty has not yet expired. The warranty period can be extended by one year. You can extend the device warranty directly via your online shop customer account. How high are the follow-up costs for chemicals? Chemical consumption depends on the number of analyses. Consumption can be determined using our indicator consumption calculator in the online shop. How often does the device need to be serviced? The manufacturer recommends servicing the device once or twice a year (i.e. every 6-12 months). Can the device be serviced by a service partner? Yes, maintenance can be carried out by an authorised Heyl Neomeris service partner. Please feel free to contact us if required via vertrieb@heylneomeris.de , so that we can find the right technician for your area. Can the device be sent in for repair (cost estimate)? Yes, the defective device can be sent to our address. When returning the device, please include a description of the fault and remove the indicator from the device before sending it back. Once we have received the defective device, you will first receive a cost estimate for the expected repair costs. The repair will only be carried out by us after you have given your prior approval.