Model 1311Xr Sensor - GE Optica Operator's Manual

January 2006

Model 1311XR Sensor

Electrical Connections
Coolant
Sample Gas Fittings
2-18
The 1311XR is a stainless steel, water cooled, five-stage sensor (see
Figure 2-18 below) that can measure frost points as low as –80°C.
The sample gas flow rate should be between 1 and 5 ft3/h. The
maximum permissible coolant temperature is +50°C; the minimum is
–10°C. A minimum coolant flow rate of 0.1 gallons per minute must
be maintained for most dew point measurements. If the fourth stage
power supply control is set below –65°C, the minimum coolant flow
rate is 0.25 gal/min. The coolant temperature affects the maximum
dew/frost point depression. For frost points of –80°C, coolant
temperature should be below 20°C.
Figure 2-18: Model 1311XR Sensor
All the electrical connectors on the Model 1311XR dew/frost point
sensor are unique. The cables supplied with the sensor can only
interconnect the system in one way. Connect the cables as follows:
1. Plug the instrument into a 115/230 VAC power outlet.
2. Connect the 37-pin round black connector on the back of the
instrument to the 19-pin military-style connector on the back of
the 1311XR sensor.
3. Connect the 17-pin military style connector on the back of the
1311XR sensor to the 24-pin round connector on the back of the
heat pump controller module.
4. Connect the 9-pin round connector on the back of the heat pump
controller module to the 8-pin rectangular connector on the back
of the fourth stage heat pump power supply.
5. Plug the heat pump power supply into a 115/230 VAC outlet.
Connect the two 3/8-inch brass compression fittings on the back of
the 1311XR sensor to the coolant lines. Do not run the instrument
without sufficient coolant flow.
Suitable coolants include water, glycol and other noncorrosive
liquids. The coolant can be recirculated liquid or tap water that is
cooled or chilled. If a recirculating chiller is used, it should have a
capacity of at least 600 watts at the coolant temperature.
The 1311XR sensor has 1/4-inch stainless steel compression fittings
for sample gas inlet and outlet at the back of the sensor chassis.
Installation