Two-Wire 4-20mA Chlorite/Chlorate Sensor For Swimming Pool Drinking Water Process Water And Seawater
Brand Name:Daruifuno
Certification:CE, ISO
Model Number:MST1
Minimum Order Quantity:Negotiable
Delivery Time:1-45 work days
Payment Terms:T/T
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Suzhou Jiangsu China
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Room 301, Building 3, No. 25 Datong Road, High-tech Zone, Suzhou City, JIANGSU P.R CHINA
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Product Details
Two-Wire 4-20mA Chlorite/Chlorate Sensor For Swimming Pool Drinking Water Process Water And Seawater
The membrane-based chlorite/chlorate sensor with two-wire 4-20mA signal output has the following main advantages and features:
1. Stability and reliability
Membrane principle: The membrane separation technology can
effectively avoid the influence of interfering ions (such as
chloride ions, nitrates, etc.) and improve the selectivity and
accuracy of the measurement.
Long-life electrode: The electrode design is durable and can
maintain stable performance for a long time under complex water
conditions.
2. Convenient signal transmission
Dual-wire 4-20mA output: No additional power supply line is
required, suitable for long-distance signal transmission, strong
anti-interference ability, good compatibility, and can be directly
connected to control systems such as PLC and DCS.
Analog signal standardization: 4-20mA output is a standard
interface in industrial automation control, which is convenient for
seamless integration with existing systems.
3. Online real-time monitoring
Supports real-time monitoring of chlorite and chlorate
concentration changes, can quickly respond to water quality
changes, and is suitable for industrial process control and water
treatment applications.
4. Low maintenance cost
Easy membrane replacement: The membrane assembly is easy to replace
and the sensor life is extended.
Long calibration interval: stable measurement, reducing the need
for frequent calibration and lowering operating costs.
5. Resistant to harsh environments
Anti-pollution design: The membrane structure can effectively
prevent the adhesion of dirt and particles, and is suitable for
various water quality conditions.
Wide range adaptability: It can work stably under different
temperature, pH and pressure conditions.
6. Safety and environmental protection
Non-reagent method: No chemical reagents are required, reducing
secondary pollution, and green and environmentally friendly.
Non-toxic materials: The main materials of the membrane and sensor
are environmentally friendly and durable, and meet environmental
protection and drinking water hygiene standards.
Three-electrode system, measuring chlorate and chlorite, used in swimming pools, drinking water, services, processes and seawater, reducing dependence on pH, tolerant to surfactants, no cross-sensitivity to chlorine dioxide, chlorine, and chlorate, and pressure resistance of 5 bar
Specifications
MST1 | |
| Indicator | Chlorite |
| Application | Drinking water, swimming pool water, service water, process water. |
| Appropriate chlorine dioxide production methods | e. g. - Acid/chlorite-method - Chlorine/chlorite-method |
| Measuring system | Membrane covered, amperometric potentiostatic 3-electrode system |
Electronic | Analog version: - voltage output - not galvanically isolated electronics - analog internal data processing - output signal: analog (analog-out/analog) Digital version: - electronic is completely galvanically isolated - digital internal data processing - output signal: analog (analog-out/digital) or digital (digital-out/digital) mA-version: - current output analog - not galvanically isolated electronics - output signal: analog (analog-out/analog) |
Working temperature | Measuring water temperature: 0 … +40 °C (no ice crystals in the measuring water) |
| Ambient temperature: 0 … +55 °C | |
Temperature compensation | Automatically, by an integrated temperature sensor Max. change in temperature: 0.3 °C per minute, sudden temperature changes must be avoided |
max. allowed working pressure | Operation without retaining ring: - 0.5 bar - no pressure impulses and/or vibrations |
Operation with retaining ring in flow cell: - 5 bar, - no pressure impulses and/or vibrations (see option 1) | |
Flow rate (Incoming flow velocity) | Approx. 15-30 L/h (33 – 66 cm/s) in flow cell |
| pH-range | pH 6 – pH 9 |
| Run-in time | First start-up approx. 24 h |
| Response time | T90: approx. 1 min |
| Zero point adjustment | Normally not necessary |
| Calibration | At the device, by analytical determination of the chlorite concentration |
MST1 | |||
Cross sensitivities/ interferences | Mn2+, Nitrite, Fe2+ No interference to Chlorine dioxide, Chlorine und Chlorate Corrosion inhibitors can lead to measuring errors. Stabilisers for water hardness can lead to measuring errors. | ||
| Absence of the disinfectant | Max. 24 h | ||
Connection | mV version: 5-pole M12, plug-on flange Modbus version: 5-pole M12, plug-on flange 4-20 mA version: 2-pole terminal or 5-pole M12, plug-on flange | ||
| max. length of sensor cable (depending on internal signal processing) | analog | < 30 m | |
| digital | > 30 m are permissible Maximum cable length depends on application | ||
| Protection type | 5-pole M12 plug-on flange: IP68 2-pole terminal with mA-hood: IP65 | ||
| material | Microporous hydrophilic membrane, PVC, PEEK, stainless steel | ||
Size | diameter: approx. 25 mm Length: mV version approx. 190 mm (analog signal processing) approx.. 205 mm (digital signal processing) Modbus version approx. 205 mm 4-20 mA version approx. 220 mm (2-pole-terminal) approx. 190 mm (5-pole-M12) | ||
| Transport | +5 … +50 °C (Sensor, electrolyte, membrane cap) | ||
storage | Sensor: dry and without electrolyte no limit at +5 … +40 °C | ||
Electrolyte: in original bottle protected from sunlight at +5 … +35 °C min. 1 year or until specified EXP-Date | |||
Membrane cap: in original packing no limit at +5 … +40 °C (used membrane caps can not be stored) | |||
maintenance | Regularly control of the measuring signal, min. once a week The following specifications depend on the water quality: Change of the membrane cap: once a year Change of the electrolyte: every 3 - 6 months | ||
Option 1: Retaining ring | - When operating with pressures >0.5 bar in flow cell - Dimensions retaining ring 29 x 23.4 x 2.5 mm, slitted, PETP - Different positions for groove selectable (on request) |
Spare Parts
| Type | Membrane cap | Electrolyte | Emery | O-ring |
| For all MST1 | M48.2 Art. no. 11047 | EMST1/GEL, 100 ml Art. no. 11202 | S2 Art. no. 11906 | 14 x 1.8 NBR Art. no. 11806 |
(Subject to technical changes!)
Technical Data
1. MST1 (analog output, analog internal signal processing)
A potential-free electrical connection is necessary as the sensor electronic is not equipped with a galvanical isolation.
Measuring range in ppm | resolution in ppm | Output Output resistance | Nominal slope (at pH 7.2) in mV/ppm | Voltage supply | Connection | |
| MST1H-M12 | 0.005…2.000 * | 0.001 | 0…-2000mV 1 kΩ | -1000 | ±5 - ±15 VDC 10 mA | 5-pole M12 plug-on flange Function of wires: PIN1: measuring signal PIN2: +U PIN3: -U PIN4: signal GND PIN5: n. c. |
MST1N-M12 | 0.05…2.00 * | 0.01 | -100 | |||
| MST1HUp-M12 | 0.005…2.000 * | 0.001 | 0…+2000mV 1 kΩ | +1000 | 10 - 30 VDC 10 mA | 5-pole M12 plug-on flange Function of wires: PIN1: measuring signal PIN2: +U PIN3: power GND PIN4: signal GND PIN5: n. c. |
MST1Up-M12 | 0.05…2.00 * | 0.01 | +100 |
* concentration tested and approved up to 2 ppm
(Subject to technical changes!)
2. MST1 (analog output, digital internal signal processing)
analog-out / digital
- The power supply is galvanically isolated inside of the sensor.
- The output signal is galvanically isolated too, that means potential-free.
Measuring range in ppm | Resolution in ppm | Output Output resistance | Nominal slope in mV/ppm | Power supply | Connection | |
| MST1H-An-M12 | 0.005…2.000 * | 0.001 | analog 0…-2 V (max. -2.5V) 1 kΩ | -1000 | 9-30 VDC approx. 20-56 mA | 5-pole M12 plug-on flange Function of wires: PIN1: measuring signal PIN2: +U PIN3: power GND PIN4: signal GND PIN5: n. c. |
| MST1N-An-M12 | 0.05…2.00 * | 0.01 | -100 | |||
| MST1H-Ap-M12 | 0.005…2.000 * | 0.001 | analog 0…+2 V (max. +2.5V) 1 kΩ | +1000 | ||
| MST1N-Ap-M12 | 0.05…2.00 * | 0.01 | +100 | |||
* concentration tested and approved up to 2 ppm
(Subject to technical changes!)
3. MST1 (digital output, digital internal signal processing)
- The power supply is galvanically isolated inside of the sensor.
- The output signal is galvanically isolated too, that means potential-free.
Measuring range in ppm | Resolution in ppm | Output Output resistance | Power supply | Connection | |
MST1H-M0c | 0.005…2.000* | 0.001 | Modbus RTU There are no terminating resistors in the sensor. | 9-30 VDC approx. 20-56 mA | 5-pole M12 plug-on flange Function of wires: PIN1: reserved PIN2: +U PIN3: power GND PIN4: RS485B PIN5: RS485A |
MST1N-M0c | 0.05…2.00 * | 0.01 |
* concentration tested and approved up to 2 ppm
(Subject to technical changes!)
4. MST1 4-20 mA (analog output, analog internal signal processing)
A potential-free electrical connection is necessary as the sensor electronic is not equipped with a galvanical isolation.
4.1 Electrical connection: 2 pole terminal clamp
Measuring range in ppm | Resolution in ppm | Output Output resistance | Nominal slope (at pH 7.2) in mA/ppm | Voltage supply | Connection | |
MST1MA2 | 0.005…2.000 * | 0.001 | 4…20 mA uncalibrated | 8.0 | 12…30 VDC RL 50Ω…RL 900Ω | 2-pole terminal (2 x 1 mm²) Recommended: Round cable φ4 mm 2 x 0.34 mm² |
MST1MA20 | 0.05…2.00 * | 0.01 | 0.8 | |||
* concentration tested and approved up to 2 ppm
(Subject to technical changes!)
4.2 Electrical connection: 5 pole M12 plug-on flange
Measuring range in ppm | resolution in ppm | Output Output resistance | Nominal slope (at pH 7.2) in mA/ppm | Voltage supply | Connection | |
MST1MA2-M12 | 0.005…2.000 * | 0.001 | 4…20 mA uncalibrated | 8.0 | 12…30 VDC RL 50Ω…RL 900Ω | 5-pole M12 plug- on flange Function of wires: PIN1: n. c. PIN2: +U PIN3: -U PIN4: n c. PIN5: n. c. |
MST1MA20-M12 | 0.05…2.00 * | 0.01 | 0.8 |
* concentration tested and approved up to 2 ppm
(Subject to technical changes!)
Two-Wire 4-20mA Chlorite/Chlorate Sensor For Swimming Pool Drinking Water Process Water And Seawater
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