eutech-instruments 2-wire dissolved oxygen transmitter ユーザーズマニュアル
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).
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;
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.
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
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
integral 5m cable
ECDOGEN
General Purpose D.O. probe, 0 – 10 ppm, Industrial,
integral 5m cable
integral 5m cable
ECDOTPll
ORP
Item
Cat Code
ORP Transmitter
ECORPXTR
Combination Platinum ORP Electrode, w/PMP,
integral 5m cable
integral 5m cable
ECHTPTTSO05B
Combination Gold ORP Electrode, w/PMP, integral
5m cable
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