Teledyne T101 Operation Manual page 52

Getting Started
The permeation tube is not included in the IZS Option and must be ordered separately.
Permeation Tube Heater
48
Temperature of the H
2
the tube and therefore increases the effusion rate.
Flow rate of the zero air: If the previous two variables are constant, the permeation rate
of the calibration gas into the zero air stream will be constant. Therefore, a lower flow
rate of zero air produces higher concentrations of H
flow rate and a constant permeation rate; hence, variations in concentration can be
achieved by changing the IZS temperature.
In order to keep the permeation rate constant, the IZS enclosure is heated to a constant
50° C (10° above the maximum operating temperature of the instrument). The IZS heater
is controlled by a precise PID (Proportional/Integral/Derivative) temperature control loop.
A thermistor measures the actual temperature and reports it to the CPU for control
feedback.
Teledyne ML – T101 Operation Manual
S: Increasing the temperature of the increases the pressure inside
NOTE
S. The T101 usually has a constant
2