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2.9
CONNECTING THE REFERENCE GAS SENSOR (RGS-01) CABLE
Connect the RGS-01 lead supplied. The oxygen probe and the RGS-01 leads are identical but they may be different
lengths. The RGS-01 also requires a mains (240 or 115 VAC) power supply, a pair a mains voltage wires from the
1635 analyser to activate the RGS-01 pump and a type 'K' thermocouple compensation lead.
2.10 CONNECTING THE DRYER OR OVEN (AUX) TEMPERATURE
THERMOCOUPLE
The dryer or oven temperature thermocouple is only required if the dryer relative humidity is to be calculated. For
1231 heated probes, the auxiliary thermocouple must be a separate TC with the junction isolated from earth, mounted
near to and upstream of the oxygen probe. It can be any one of the types 'K', 'T', or 'J'. If relative humidity or
auxiliary temperature for display or transmitted signals are not required, then an auxiliary TC is not required.
If relative humidity is required in a direct fired application, the drier temperature must be connected to terminals
55&56. This is a 4-20mA input scaled to 0-400°C. R55, just above CN16, must be 47 ohms, or an external 47 can be
placed across terminals 55&56.
2.11 CONNECTING THE OUTPUT CHANNELS
The two 4 to 20 mA DC output channels are capable of driving into a 1000Ω load.
August 2009
1635 Water Vapour Analyser
Connections for a Reference Gas Sensor (RGS) to a 1635 Analyser
Connect a Maximum
load resistance of 1000 Ohms.
Outputs are 4-20mA, DC isolated.
Connections for Analyser Output Channels
12
CH1 O/P +
13
CH1 O/P -
14
CH2 O/P +
15
CH2 O/P -
19
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