Oldham ctx 300 - CTX 300 calibration for O2

26
CTX 300
User manual
CTX 300 calibration for O2
This sensor is an Oxygen type.
1
st
case: CTX 300 O2 with display
■ See paragraph 1
st
case: CTX 300 with
display, on page 22. Proceed only
with adjusting sensitivity (rep. 1) by
injection of test gas.
Figure 26
2
nd
case: CTX 300 O2 without display screen nor LED
■ See paragraph 2
nd
case: CTX 300
without display on page 24. Proceed
only with adjusting sensitivity (rep. 1)
by injection of test gas.
Signal value mV:
- 1600 mV for full scale, means 30 %
O
2
.
- 1115 mV for 20.9 % O
2
.
- 0 mV for 0% O
2
.
Figure 27
Note: the signal sent from the
CTX300 (toxic or oxygen) sensor to
the control unit can be measured on
the main circuit by connecting a
millivoltmeter to the pins designed for
this purpose (Figure 28).
- 400 mV corresponds to 4 mA.
- 2000 mV corresponds to 20 mA.
Figure 28