Perma Pure Micro-GASS UG - Manual (Page 7)

7 Micro-GASS User Manual
Figure 2
2.5 Temperature Control
The operating range of the Micro-GASS is from 45 O C to 65 O C. To maintain the proper operating
temperature the purge gas exhaust is monitored and controlled by the electronic temperature
controller. Dry sample gas returns to the system at ambient conditions, cooling the outlet end of the
dryer. As the purge gas passes through the dryer it is heated to the desired sample inlet
temperature, creating a temperature gradient along the dryer. This gradient allows for both rapid
water removal and decreased final dew point.
a. System Power – The system power switch controls power to the temperature controller,
and the filter, dryer, and heated-line heaters. System power is on a 2 Amp fuse, located
on the front panel.
b. Pump Power – The pump power is wired through the temperature controller. In order
for the pump to engage, the system must be heated to 40°C and the pump power switch
must be in the “ON” position. Sample flow is controlled by the flow meter.
c. Temperature Control - The dryer heaters are controlled by a PID electronic
temperature controller. Set-point adjustment is made by pressing the “ * ” key and either
the up arrow key or the down arrow key simultaneously. When the desired temperature
is displayed, release both keys. The allowed set-point range and the pump cut-off
temperature are preset by Perma Pure, LLC. Refer to APPENDIX C for the temperature
controller configuration or to the manual included with the documentation package.
d. Flow Control – System flow is measured after the analyzer in the dry sample at
atmospheric pressure and temperature. The flow meter should be adjusted to provide a
flow of between 0.5 to 1.0 lpm, depending on the water content of the sample. Lower
flow rates result in dryer samples.