Flexibility, low maintenance and low installation costs are among the benefits of the EXA PH202 pH transmitter. Designed to meet the exacting requirements of measuring pH and ORP in the modern industrial environment, it contains many features to ensure peak precision whatever the application.
This 2-wire (loop powered) transmitter is housed in a robust IP65 field mountable case. The need for expensive cabling is minimized, and an IS version is available for hazardous area duty.
|Measuring principle||Glass electrode method|
|Input ranges||pH: -2 to 16 pH
ORP: -1500 to 1500 mV
rH: 0 to 55 rH
Temperature: -30 to 140℃
|Output ranges||pH: Min. 1 pH, Max. 20 pH
ORP: Min. span 100 mV, Max. span 3000 mV
rH: Min. 2 rH, Max. 55 rH
Temperature: Min. 25℃ , Max. 200℃
|Output Signal||4 to 20 mA DC loop powered, isolated from input
With the possibility of 21 mA "FAIL" signal (burn up) and 3.6 mA (burn down when HART or distibutor comm. is non-used), 3.9 mA (burn down when HART or distributor comm. is used).
|Temperature compensation||Range: -30 to 140℃ (for 8k55 sensor -10 to 120℃ ).
Sensor types: Pt100, Pt1000, 3 kΩ RTC, 5.1 kΩ PTC, 8.55 kΩ NTC, 350 Ω PTC, 6.8 kΩ PTC, 10 kΩ PTC. Automatic or manual compensation to Nernst equation. Process compensation by configurable coefficient. Adjustable ITP (Iso-thermal point of intersection).
|Calibration||Semi-automatic, using tables in transmitter for pH 4, 7 & 9 buffer solutions, or using user-defined tables, with automatic check of measurement stability.
Manual, using standard sample, by correcting reading to value of standard.
Calibration by slope and asymmetry potential setting. (IEC60746-2)
|Communication||HART®, PROFIBUS-PA, FOUNDATION Fieldbus H1|
|Ambient temperature||-10 to 55℃|
|Humidity||10 to 90 % RH (Non-condensing)|
|Display||Custom liquid crystal display, with a main display of 3 1/2 digits 12.5 mm high.|
|Power supply||Nominal 24 volt DC loop powered system.
PH202G: 17 to 40 V
The specifications are expressed with simulated inputs.
|pH||Linearity: ±0.01 pH
Repeatability: ±0.01 pH
Accuracy: ±0.01 pH
|ORP||Linearity: ±1 mV
Repeatability: ±1 mV
Accuracy: ±1 mV
pH measurement in brine solutions (for example NaCl solutions as found in electrolysis processes or cheese manufacturing) are difficult and inaccuracy and short sensor life are the key problems in these applications.
The lifetime of a pH sensor has a significant impact on the overall annual costs of a pH measuring loop. Optimizing four key factors will decrease these costs and optimize process control and overall plant efficiency.
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