Two wire online pH transmitters are widely used for online monitoring of pH/ORP in thermal power, chemical, metallurgical, water treatment, pharmaceutical, biochemical, electronic, electroplating, printing and dyeing, chemical, food, and tap water.

Two wire online pH transmitterTypical Applications
Widely used for online monitoring of pH/ORP in thermal power, chemical, metallurgical, water treatment, pharmaceutical, biochemical, electronic, electroplating, printing and dyeing, chemical, food, and tap water industries.
Two wire online pH transmitterfeature
Two line system integration
Adopting a single-chip microcomputer with low power consumption, high performance, high stability, and high reliability.
High measurement accuracy, fast response speed, small size, easy installation and maintenance
Intrinsic safety explosion-proof, explosion-proof grade Exia IIB T4 or isolated explosion-proof, explosion-proof grade Exd IIB T4
Parameter power-off protection.
Equipped with two-point or one point automatic calibration function, convenient and accurate.
Automatic temperature compensation.
Can display the zero potential pH value and slope of the electrode system.
The instrument adopts a two-point calibration method, with a two-wire 4-20mA output
technical indicators
Measurement range pH: 0-14pH
Temperature: 0-200 ℃
basic error
PH:±0.05pH
Temperature: ± 0.5 ℃
Input impedance: greater than 1012 Ω
Temperature compensation range and influence error: 5-55 ℃, ± 0.5% FS/10 ℃
Current output: 4-20mA (RL ≤ 500 Ω) ± 0.5% FS
working conditions
a. Environmental temperature: 0-55 ℃
b. Relative humidity: less than 85%
c. Power supply: 24VDC ± 5%
d. Temperature of the tested solution: 0-100 ℃.
The transmitter adopts an explosion-proof cast aluminum sealed housing, with a protection level of up to IP67, LED display, and two-wire isolated current output. It is particularly suitable for industrial sites with harsh environments, the presence of explosive gases, and explosion-proof requirements.
Selection Table |
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Y |
Integrated type (measurement, 4-20mA output integrated) |
structural style |
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F |
Split type (high impedance sensor, mV electrode signal output, matched controller on-site display) |
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G |
Domestic pH electrode sensor |
Electrode |
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U |
Imported electrode sensors from abroad |
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C |
Insertion type M48 × 2 thread, insertion depth of 100, 150, 200mm (user reference) |
Installation method |
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F |
Submerged (installation height 0.6m-4m), flange or threaded installation, specify when ordering |
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S |
Horizontal flow type (with matching horizontal flow pool) DN25, PN0.6 flange GB9119.2-88 |
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T |
User specific requirements |
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P |
Ordinary industrial processes use 0-80 ℃ |
Application scenarios |
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J |
Use 0-100 ℃ in high temperature and strong alkali environments |
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S |
High temperature strong acid field suitable for 0-110 ℃ |
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W |
0-80 ℃ is used in sewage treatment facilities |
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D |
Use 0-100 ℃ in low conductivity situations |
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X |
Disinfect and ferment at 0-135 ℃ |
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Y |
High temperature and high pressure, organic matter 0-140 ℃ (1MPa) |
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R |
Specialized electrodes for printing and dyeing |
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C |
Ultra low temperature type -25-25 ℃ |
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00 |
atmospheric pressure |
pressure |
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06 |
≤0.6MPa |
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10 |
≤1.0MPa |
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W |
No on-site instructions (integrated) |
on-site display
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M |
On site pointer type mA meter display (integrated type) |
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E |
On site LED display |
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C |
On site LCD display |
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A |
ABS |
wetted material |
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P |
UPVC or PPR (specify when ordering) |
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B |
1Cr18Ni9Ti |
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F |
Stainless steel polytetrafluoroethylene composite material |
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Q |
Other materials |
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O |
non-explosion-proof |
explosion-proof |
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I |
Intrinsic safety explosion-proof (4-20mA) explosion-proof grade Exia IIB T4 |
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Installation length (sunken, plug-in) L=? |
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Measurement range PH |
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Selection example: ST-L2006 Y U F P 00 E B O L=500mm 0-10PH