Teledyne 212R - Thermal conductivity analyzer - Manual (Page 24)

Teledyne Analytical Instruments 24
Thermal Conductivity Analyzer Model 212R
CAUTION: Do not touch the thermistor probe with the iron. The
end of the probe is tied and taped to the sample tubing
below the cell cover. If the meter reading suddenly
drops to zero, remove the soldering iron immediately.
After the area around the thermistor cools, the voltage
across the heater resistors should again climb to 47
volts. Such action indicates a properly functioning
heater circuit. If the meter stays in the 47 volt region,
the circuit card will have to be replaced.
7.0 CALIBRATION DATA FOR MODEL 212R
SERIAL NUMBER: 195929
7.1 Ranges.
The ranges of the analyzer are:
Range Switch Position #1: 0-50,000 ppm N
2
in H
2
Range Switch Position #2: 0-5000 ppm N
2
in H
2
Range Switch Position #3: 0-500 ppm N
2
in H
2