Model 1311Xr Sensor - GE Optica Operator's Manual

Chapter 2. Installation

2.6.5 Model 1311XR Sensor

The 1311XR is a stainless steel, water cooled, five-stage sensor (see Figure 22 below) that can measure frost points as
low as –80°C. The sample gas flow rate should be between 1 and 5 ft
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.
2.6.5a Electrical Connections
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.
2.6.5b Coolant
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.
2.6.5c Sample Gas Fittings
The 1311XR sensor has 1/4" stainless steel compression fittings for sample gas inlet and outlet at the back of the sensor
chassis.
24
Figure 22: Model 1311XR Sensor
3
/h. The maximum permissible coolant
Optica™ Operator's Manual