25
8.2.2
Technical Specifications and Special Instructions for Oxygen detectors
8.2.2.1
Transfer curves for OLCT 20 detectors
The following curve shows the transmitter output current value as a function of gas
concentration. Where the user connects the transmitter to a device other than a device manufactured
by OLDHAM, he must check that the transfer curve is fully compatible with its input characteristics
to ensure that the information generated by the transmitter is correctly interpreted. Equally, the
device must supply a suitable power supply voltage, allowing for cable voltage losses.
8.2.2.2
Metrological data
Maximum concentration
30% O
2
Type and number
CT5020 CELL
Principle
2-electrode electrochemical
(Measurement of oxygen
concentration by volume)
Estimated service life
30 months
Storage
4°C < T < 12°C
10% < RH < 60%
Temperature range
-20°C to +45°C
Humidity range
20% RH to 95% RH
Pressure range
1 bar ± 10%
Accuracy at 20°C
15 to 21% O
2
± 0.5% vol O
2
1 to 14% O
2
± 0.6% vol O
2
Repeatability
< 2% of signal
T90 response time
< 15 seconds
Effect of temperature (0 to 40°C)
< 0.5% vol O
2
Effect of humidity (10% to 90% RH)
The measurement is lower as a
result of the air being diluted by
water vapour
Sensitivity drift over time
< 2% per month
Zero stabilisation time following
power-up
30 to 60 minutes
0 %
30.0 % 36.0%
20
.
0 mA
4
.
0 mA
1 mA
% O2 concentration
by volume
Output Current in mA
Fault
23
.
2 mA
Fault
Содержание OLC 20
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