Service Procedures - Teledyne T200 User Manual

PMT T
EMPERATURE
The temperature of the PMT should be low and constant. It is more important that this
temperature is maintained at a constant level than it is to be a specific temperature.
The PMT cooler uses a Peltier, thermo-electric cooler element supplied with 12 V DC
power from the switching power supply PS2. The temperature is controlled by a
proportional temperature controller located on the preamplifier board.
• Voltages applied to the cooler element vary from 0.1 to 12 VDC.
• The temperature set point (hard-wired into the preamplifier board) will vary by ±2 ° C.
• The actual temperature will be maintained to within 0.1° C around that set point.
To check the operation of the PMT temperature control system:
1. Turn off the analyzer and let its internal components cool / heat to ambient
temperature.
2. Turn on the analyzer.
3. Set the front panel to show the PMT TEMP test function (Setup>Dashboard).
•
•
•
S
ERVICE
This section contains some procedures that may need to be performed when a major
component of the analyzer requires repair or replacement.
Note
083730200A DCN7962
S C
ENSOR ONTROL
The temperature should fall steadily to 6-10° C.
If the temperature fails to reach this point after 60 minutes, there is a problem
in the cooler circuit.
If the control circuit on the preamplifier board is faulty, a temperature of –1°
C will be reported.
P
ROCEDURES
Regular maintenance procedures are discussed in Section 5.5
and are not listed here). Also, there may be more detailed service
notes for some of the below procedures. Contact Teledyne API's
Technical Support Department.
WARNING – ELECTRICAL SHOCK HAZARD
Unless the procedure being performed requires the instrument
to be operating, turn it off and disconnect power before
opening the analyzer and removing, adjusting or repairing any
of its components or subsystems.
CAUTION – QUALIFIED TECHNICIAN
The operations outlined in this chapter are to be performed
by qualified maintenance personnel only.
Teledyne API T200 NO/NO /NO Analyzer with NumaView™ Software
2 x
165