Cambridge Sensotec Rapidox 1100ZR-H-PFC-E O
2
Analyser Instruction Manual
Version 1.2
14
Last printed 22/07/2015 18:08:00
programmed the new values remain in the memory until they are edited again in
the future.
To select and modify the pressure outputs scroll down to menu option 4 “Set
Outputs” and pres ENT four times. Change the low and high range using the same
procedure described above. The permissible range is -1000mbar to +2000mbar.
Note that the voltage (0 to 10V) and current (4 to 20mA) outputs are locked
together, so that these outputs cannot be set independently of each other. In
normal operation therefore, 0V output always corresponds to 4mA and 10V
always corresponds to 20mA output.
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 (1.25V) 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 (0.625V) which is the
sensor fault signal. This will recover as soon as the sensor is reconnected and the
fault cleared. Additional current and voltage signals are provided by the analyser
to give an indication of various conditions and these are described in Table 4
below, together with the status of the alarms during the condition:
O
2
Analogue Outputs
Description
Explanation
Alarms
(3)
Current
(1)
(4-20mA)
Voltage
(2)
(0-10V)
1mA
0.625V
Fault
There is a sensor fault on the oxygen
sensor, and/or the temperature sensor
has a fault condition, and/or the
pressure mode is set to automatic
(pressure compensation active) and
the pressure sensor has a fault
condition.
De-activated
2mA
1.25V
Start up
The analyser is still initialising.
De-activated
2.5mA
1.5625V
Sensor under range
The sensor reading is under range.
Active
3mA
1.875V
Sensor over range
The sensor reading is over range.
Active
3.5mA
2.1875V
Sensor operating out of
specification
The sensor reading is in range but the
temperature sensor reading is out of
range, and/or the pressure mode is set
to automatic (pressure compensation
active) and the pressure sensor is out
of range.
Active
4 to 20mA
0 to 10V
Normal operating output
The O
2
sensor and associated
(1)
sensor(s) are operating normally and
readings are in range.
Active
Table 4: Analogue output settings and alarm status for certain conditions
Notes:
1
The current outputs are active self-powered outputs - they are not loop powered.
2
The voltage (0 to10V) outputs produce non-zero voltages during start-up, fault and over/under range conditions - if
1V to 5V outputs are required, with these conditions indicated by corresponding voltages between 0V and 1V, the
current outputs can be used, with a 250 Ohm load resistor.
3
Alarms are de-activated during start up initialisation, and when a fault condition occurs on the assigned sensor.
Note that the secondary auxiliary outputs on this version of the Rapidox are
replaced with outputs that control the PFC. Please see Appendix 1 at the end of
this manual for detailed instructions on how the PFC is programmed, tuned and
used.