Maintenance - Electro-Tech systems 204 Operating Manual

5.0 Calibration
The Model 204 is a complex instrument. It is recommended that it be calibrated
at the factory.
However, the customer can check the voltage reading calibration by applying a
known voltage, such as 500 or 1000V directly to the detector plate and compare
it with the meter reading. If out of tolerance, the Charged Plate Detector
Assembly can be moved slightly in to increase or out to decrease the meter
reading.

6.0 MAINTENANCE

The Model 204 Charged Plate Analyzer and the respective kits contain both
electronic instruments (Charged Plate Analyzer and Humidity/Temperature/Dew
Point Indicator) plus mechanical fixtures (Charged Plate Detector, 6"x6"
[152x152mm] Detector Plate and tripod). As with all instrumentation, care should
be exercised in handling and using the equipment. If not exposed to hostile
environments, the mechanical fixtures should not require any maintenance. To
clean the fixture, wipe with only isopropyl alcohol using a soft lint-free cloth and
let air-dry.
DO NOT USE ANY OTHER TYPE CLEANER AS THIS WILL PRODUCE A
LEAKAGE PATH TO THE ISOLATED CHARGED PLATE.
When used with reasonable care, the instruments should provide many years of
trouble-free service. If either electronic unit fails to operate properly, first check
the battery. The sensors, both static and humidity/temperature, should never be
touched by a charged object or by personnel. Also, the sensors could be
permanently damaged if the instruments are dropped.
The sensor used in the Model 204 is very sensitive to shock. Dropping the
unit could result in permanent damage to the sensor and will require
replacement.
To clean the conductive ABS plastic case, a damp cloth should be used. Do not
use any solvents as these may react with the plastic and damage the case.
The Model 5646A Humidity/Temperature/Dew Point Indicator does not contain
any user serviceable parts and must be returned to the factory for service or
replacement.
Note:
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