Thermo Fisher Scientific 2-Wire pH/ORP Transmitter User Manual
Page 2
68X256901 Rev 1 10/99
3)
Amp meter should read 12mA; if not, calibration is necessary;
4)
Locate “Offset adjustment” trimmer; Using a fine screwdriver,
slowly turn trimmer till Amp meter reads 12mA;
5)
For greater accuracy, adjust slope with pH 4 or 10;
6)
Rinse probe in de-ionised water and immerse in either pH 4.01 or pH
10.01 buffer solution;
7)
In pH 4.01, the output is 8.54mA;
8)
In pH 10.01, the output is 15.44mA;
9)
Using a fine screwdriver, slowly turn trimmer, marked ‘slope’, till Amp
meter reads correct mA value with respective buffer solutions.
10) Remember to disconnect Amp meter and close cover.
NOTE: For other buffer values, expected current output is based on:
mA = {(16/14) x buffer pH value} + 4mA
8
ORP Transmitter Calibration
1)
Prepare fresh Standard solutions, such as 255mV, 470mV.
2)
Short ORP inputs and observe Amp meter display;
3)
Amp meter should read 4mA; if not, calibration is necessary;
4)
Locate “Offset adjustment” trimmer; Using a fine screwdriver,
slowly turn trimmer till Amp meter reads 4mA;
5)
For greater accuracy, adjust the slope with Standard calibrating
solutions;
6)
Rinse probe in de-ionised water and immerse in standard solution;
7)
In 255mV solution, the output is 8.08mA;
8)
In 470mV solution, the output is 11.52mA;
9)
Using a fine screwdriver, slowly turn trimmer, marked ‘slope’, till Amp
meter reads correct mA value with respective Standard solutions.
10) Remember to disconnect Amp meter and close cover.
NOTE: For other Standard values, expected current output is based on:
mA = {(16/1000) x ORP value of Standard solution} + 4mA
9
Specifications
Model
ECPHXTR
ECORPXTR
Range
0.00 – 14.00 pH
0 to +1000mV
Accuracy
±
0.05 pH
±
3 mV
Calibration
Offset
±
1pH
Slope 80 – 120%
Offset
±
50mV
Slope 80 – 120%
Input
Asymmetrical or Symmetrical (with Potential Matching
Pin)
Output
4-20 mA
Operating
Voltage
DC 12 V to 24 V
Load
100 Ohms max. for 12 V;
600 Ohms max. for 24V
Housing
77 x 77 x 28 mm, field mountable
10 Appendix 1
Connecting Amp Meter for Calibration
Figure 3 - Method One
Figure 4 - Method Two
11 Ordering Information
pH
Item
Cat Code
pH Transmitter
ECPHXTR
Combination pH Electrode, General, integral 5m cable
ECARTSO05B
Combination pH Electrode, w/PMP, integral 5m cable
ECARGTSO05B
Dissolved Oxygen
Item
Cat Code
Dissolved Oxygen Transmitter
ECDOXTR
General Purpose D.O. probe, 0.5 – 40 ppm, Industrial,
integral 5m cable
ECDOGEN
General Purpose D.O. probe, 0 – 10 ppm, Industrial,
integral 5m cable
ECDOTPll
ORP
Item
Cat Code
ORP Transmitter
ECORPXTR
Combination Platinum ORP Electrode, w/PMP,
integral 5m cable
ECHTPTTSO05B
Combination Gold ORP Electrode, w/PMP, integral
5m cable
ECHTAUTTSO05B
Conductivity
Item
Cat Code
Conductivity Transmitter
ECCONXTR
2-Pin SS,k=1.0, integral 3m cable
ECCONSEN46
Temperature
Item
Cat Code
Temperature Transmitter
ECTEMPXTR
Pt 100 probe, SS316
ECPT10001M or
ECPT10005M
Power Supply
Item
Cat Code
120V Power Supply
EC-120-XTR
220V Power Supply
EC-220-XTR