PH Meter (Explosion-Proof Type)
Model No.:JM-3101
The transmitter adopts two-wire system, has 24VDC power supply, and simple wiring. It can output 4-20mA, 4-20mA+HART, RS485, 4-20mA+ RS485 and other signals to display, recording, control, regulation and other instruments or PLC, DCS, FCS systems; the explosion-proof mark is ExiaIICT 6Ga, which is suitable for areas 0, 1, and 2, and places containing Class IIA to IIB and T1 to T4 explosive gas mixtures;
Detailed Description
1.Product overview:
The transmitter adopts two-wire system, has 24VDC power supply, and simple wiring. It can output 4-20mA, 4-20mA+HART, RS485, 4-20mA+ RS485 and other signals to display, recording, control, regulation and other instruments or PLC, DCS, FCS systems; the explosion-proof mark is ExiaIICT 6Ga, which is suitable for areas 0, 1, and 2, and places containing Class IIA to IIB and T1 to T4 explosive gas mixtures;
- Intelligent: JM-3101PH/ORP transmitter adopts AD conversion and single-chip microcomputer microprocessor technology, and can complete various functions such as pH measurement, temperature measurement, automatic temperature compensation, and instrument self-test;
- High reliability: Highly integrated components, without complex functional switches and adjustment knobs;
- Strong anti-interference ability: New devices are used, and the impedance is as high as 1012Ω; current output adopts photoelectric coupling isolation technology, which has strong anti-interference ability and realizes remote transmission. Have good electromagnetic compatibility;
- Waterproof and dustproof design: protection level IP67, suitable for outdoor use;
- 25℃ conversion: The 25℃ benchmark temperature conversion is carried out for pure water and ammoniated ultrapure water, which realizes the display of pH value at 25℃, which is especially suitable for measuring weak conductivity water quality such as desalted water in power plants or chemical plants;
- Diversification of calibration buffers: Calibration buffers are allowed:1. National standards (1.68, 4.00, 6.86, 9.18); 2. NIST professional buffers (1.68, 4.00, 7.00, 10.01);3. Mettler Toledo professional buffers (2.00, 4.01, 7.00, 9.21);
- Diversified calibration methods: There are 4 calibration methods for pH glass electrodes and 2 calibration methods for antimony electrodes;
- Communication: RS485 and HART are available, making it easy to connect to a computer for monitoring and communication;
- Intrinsic safety explosion-proof design and explosion-proof mark ExiaIICT 6Ga are used in Zone 0, Zone 1 and Zone 2.
2.Product parameters
| Measurement range | pH：-2—14.00ph | ORP:1999~+1999mV | Temperature :-15～130℃ |
| Resolution | 0.01pH | 1mV | 0.1C |
| Accuracy | ±0.01pH | ±1mV | ±0.5℃(0~100.0℃) |
| Automatic temperature compensation range | 0~100℃,Based on 25°C | Repeatability error | ±0.01pH |
| Automatic temperature compensation error | ±0.03pH | Stability | ±0.02pH/24h |
| Input impedance | 2100 | Output current error | ≤±1%FS |
| Communication | RS485,HART(Optional） | Power supply | DC24V±2.4V |
| Protection rating | IP67 | Explosion-proof rating | ExiaIICT6 Ga |
| Current isolation output | 4~20mA；
Input, output, and power supply are isolated (powered by a safety barrier) |
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| Operating conditions | Ambient temperature: -20 to 70°C, relative humidity < 90% | ||
| Intrinsic safety parameters | Ui=28VDC,Ii=93mA,Pi=0.65W,Ci=0.044uF,Li=0mH | ||