Product
Measuring Amplifier for pH and Redox type M3720
Minh Quan Technology Joint Stock Company
Hotline: 01692 114 683
Mr Que: 0973 852 363
Ms Ha: 0165 2197 433
Email: mqtekvietnam@gmail.com
Call usProduct information
- 0…14pH, -1000…+1000mV
- output 4…20mA, 2-wire-technics
- 24VDC power supply
- galvanically isolated
- modbus
- optional 2 – wire temperature compensation up to 100°
- hold function
Product Details
The very small measuring amplifier for pH and Redox type M3720 converts the electrode signal to a 4…20mA 2-wire signal.
The M3720 works with a resolution of 12 bit, is pre-calibrated and connected between the electrode and the signal acquisition instrument (e. g. PLC). Process control systems or any other control electronics may be connected to the amplifiers output.
The electrode may be calibrated at the amplifier by a push button. Two LEDs indicate the calibration status. The hold function can freeze and release the output signal at any time.
Sensor input and output are galvanically isolated from the output and power supply. The robust housing fulfills the protected class IP67 and allows application in rough environments.
Optionally a 2-wire temperature compensation up to 100°C is available. pH/mV-electrodes with build-in temperature sensors are accepted by the amplifier.
All settings and measured values may be read out and changed by the Modbus protocol.
Specifications
| Measuring ranges: | 0.00 to 14.
-1000 to +1000mV |
| Sensor inputs: | Analog sensor, digital “Mettler Toledo” sensor on request |
| Accuracy: | 0.1% @ 25°C |
| Stability: | 0.003% per °C |
| Reproducibility: | 0.1% |
| Linearity: | 0.05% |
| Input impedance: | 1000GΩ (1012 Ω) |
| Output rate: | 10-90%: Typ. 10s, adjustable from 2s – 9min |
| Signal output:
– Max load: – Output impedance |
4…20mA, adjustable over full range, others on request
500Ω @ 24V, 100Ω @ < 24V Typ. >1MΩ |
| Calibration buffer solutions: | Typical 4.00pH, 7.00pH, 10.00pH, others on request, Modbus programmable |
| Hold function: | By double-clicking on the “Cal” button, the hold function for the current output can be turned on or off. |
| Temperature: | 0…100°C without compensation or wire break: 25°C Automatically with an external transmitter. (PT100/PT1000/NTC30K) Types: NTC30k B = 3480, optional: NTC30k B = 4143 |
| Operating temperature: | -10°C … +40°C |
| Max. working temperature: | -25°C … +65°C |
| Storage temperature | -40°C … +85°C |
| Power supply range: | 15 … 30VDC |
| Insulation resistance: | > 5000MΩ @ 50VDC |
| Test isolation voltage | 500VAC/1 minute (input -> output & power supply) |
| CE-Conformity: | confirmed |
| EMV-Conformity: | In accordance with EN61000-6-2, EN61000-6-4 und EN61326-1 |
| Weight: | ≈ 50g |
| Warranty | 2 years |
| Material: | anodized aluminum, IP67, others on request |
| Connection 2-wire signal: | Cable ends, red = +24VDC, black = 4…20mA, shield |
| Connection Modbus: | Cable ends, brown = RS485A, orange = RS485B |
| Connection electrode: | Coax core = pH, Coax shield = reference |
| Cable length 2-wire signal: | 300m, 3m factory-made |
| Cable length electrode: | 60cm, factory-made, connected |
| Options: | Customer specified functions/cable connection
Modbus Connection for Mettler Toledo digital sensors |
| Ordering example: | 1x M3720-pH 0…14pH = 4…20mA
1x M3720-mV -1000mV…+1000mV = 4…20mA 1x M3720-Modbus |
