Kurt J. Lesker 979 Series, Operation And Maintenance Manual

Page: 11 / 54

Series 979 ATV Transducer 11
Safety Precautions
Always disconnect the power supply before removing
electronics from the Hot Cathode sensor for sensor replacement
or bakeout purposes.
Lethal voltages and currents may be present
while the circuit is operating. Only a qualified technician should
replace or adjust electronic components.
Use the proper power source. Use + 24 VDC @ 0.75 Amps.
Properly ground the transducer. The transducer should be
connected to earth ground both through the vacuum flange and the
back shell of the electrical connector.
Do not turn on filament power when system pressure is above
5x10
-2
Torr. Hot Cathode sensor damage will result.
Do not operate with explosive gas mixtures or gases that are
combustible in air.
The Hot Cathode sensor has a heated element
and the MicroPirani uses a thin-film Nickel element that is heated to
a constant temperature above ambient. Either of these could ignite
explosive gas mixtures.
Do not substitute parts or modify instrument. Do not install
substitute parts or perform any unauthorized modification to the
instrument. Return the instrument to an Kurt J. Lesker Calibration and
Service Center for service and repair to ensure that all of the safety
features are maintained.