Servomex SERVOTOUGH Oxy, Operator'S Manual

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© Servomex Group Limited. 2020 01910001B_8
5.3.4
Auto Validate/Calibrate connections (option)
Th
e auto validate/calibrate board connec�ons are separated from the analyser
mains
circuits by reinforced insula�on. The terminals must only be connected to circuits that
are themselves separated from mains voltages by at least reinforced insula�on.
The
analyser can be supplied with auto
-
validate/calibrate relays and switched inputs. The relays can
control solenoid valves in the gas supply system to perform validate or calibrate rou�nes.
Depending on whether you have chosen to do a Remote Validate/Calibrate rou�ne or an Auto
Validate/Calibrate (see Sec�on 6
and
Sec�on 6.2) the pin assignments will have different func�ons.
Note:
Unlike the relays detailed in Section 5.3.3, the autovalidate/calibrate relays cannot
have their default configuration changed in any way.
Relay Signal Terminal pin Use
Sample Gas* N/O
P803 Pin 1 Open
to isolate sample gas flow
COM P803 Pin 2
(Common)
N/C
P803 Pin 3
Closed to isolate sample gas flow
Low
Calibra�on
Gas
N/O P803 Pin 4 Closed to start low calibra�on gas flow
COM P803 Pin 5
(Common)
N/C
P803 Pin 6 Open
to start low calibra�on gas flow
High
Calibra�on
Gas
N/O
P803 Pin 7
Closed to start high calibra�on gas flow
COM P803 Pin 8
(Common)
N/C
P803 Pin 9 Open
to start high calibra�on gas flow
* The Sample Gas relay is configured "Fail Safe", i.e. is permanently energised in normal opera�on. If
there is a power supply failure to the analyser, then the relay state will change and the sample gas flow
to the
analyser will be isolated. This helps to protect the analyser against sample corrosion during power
interrup�ons.
Digital Input Signal Terminal pin Use
Ini�ate Auto Valida�on /
Auto Calibra�on / Calibrate
Low
(Momentary Input)
+ve P804 Pin 1 +12V to 24V to start
-ve
P804 Pin 2
0V
Stop Auto Valida�on / Auto
Calibra�on / Calibrate High
(Momentary Input)
+ve P804 Pin 3 +12V to 24V to start
-ve
P804 Pin 4
0V