Thermo Fisher Scientific 2-Wire Dissolved Oxygen Transmitter User Manual
Page 2
68X256903 Rev 1 10/99
6
Before Calibration
Remove cover of Transmitter and ensure that electrode is correctly
connected as above. Connect Amp meter to the 4/20mA output of
Transmitter (Appendix 1).
7
Dissolved Oxygen Transmitter Calibration
1)
Short Dissolved Oxygen input and observe Amp meter display;
2)
Amp meter should read 4mA; if not, calibration is necessary;
3)
Locate “Offset adjustment” trimmer; Using a fine screwdriver,
slowly turn trimmer till Amp meter reads 4mA;
4)
For greater accuracy, adjust the slope using Air as a reference;
5)
Hold the dry probe in Air;
6)
In 100% Saturation (in Air), output is 12 mA;
7)
In 200% Saturation, output is 20 mA;
8)
Using a fine screwdriver, slowly turn trimmer, marked ‘Slope’, till
Amp meter reads correct mA value with respective Oxygen
Saturation levels.
9)
Remember to disconnect Amp meter and close cover.
NB: For other % Saturation values, expected current output is based on:
mA= {(16/200) x % Saturation of Dissolved Oxygen} + 4mA
8
Specifications
Model
ECDOXTR
Range
0 to 200%
Accuracy
±
1.5% Full Scale
Calibration
1 point (100% air saturation)
Input
Only with Galvanic DO probe – 2 wires
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
9
Appendix 1
Connecting Amp Meter for Calibration
Figure 3 - Method One
Figure 4 - Method Two
10 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