Cambridge Sensotec Rapidox 1100E Oxygen Analyser Instruction Manual
Version 3.8
10
Last printed 29/08/2012 16:01:00
"Lin(ppm)"
Linear output mode
0
1.25
2.5
3.75
5
6.25
7.5
8.75
10
0
10
20
30
40
50
60
70
80
90
100
O
2
(%)
O
2
V
o
lt
s
o
u
tp
u
t
4
6
8
10
12
14
16
18
20
O
2
m
A
o
u
tp
u
t
Figure 3: Graph showing the linear output mode option for oxygen
The following general formulae can be used to calculate the oxygen from the
voltage or current outputs when set to the linear output mode:
Output type Formula for calculating oxygen from analogue output signal
0-10V
O
2
= V
out
/ 10 * (O
2H
- O
2L
) + O
2L
4-20mA
O
2
= (mA
out
– 4) / 16 * (O
2H
- O
2L
) + O
2L
Where:
O
2L
= user setting of oxygen for 0V or 4mA output
1
O
2H
= user setting of oxygen for 10V or 20mA output
1
V
out
= the measured voltage output in volts
mA
out
= the measured current output in mA
1
O
2
, O
2L
and O
2H
must all be in the same units.
To modify the oxygen analogue output range scroll down the menu to no.3 “Set
Outputs” and press ENT. You can now edit the lower and upper values in exactly
the same manner as described in 6.6 for setting the cal gas values. Once
programmed the new values remain in the memory until they are edited again in
the future.
To select and modify the auxiliary outputs (pressure) scroll down to menu option
3 “Set Outputs” and pres ENT four times. Use the up and down arrow buttons to
program the pressure scale and press ENT.
During initial warm up of the Rapidox when the display reads the serial number
the output sent to the rear terminal for oxygen will stay at 2mA (1V) which is the
standby signal. If at any stage a sensor becomes disconnected internally, or the
signal exceeds the measurable range for that sensor, then the display will indicate
there is a fault and the outputs will change to 1mA (0.5V) which is the sensor fault
signal. This will recover as soon as the sensor is reconnected and the fault
Summary of Contents for SENSOTEC Rapidox 1100E
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