Chapter 7 Servicing
7-14
Fullscale Analog Outputs Screen
6. Repeat the above steps to ensure the adjustments are accurate.
7. Re-install the instrument cover.
PRESSURE TRANSDUCER ADJUSTMENT
This procedure should only be performed by an instrument service technician.
Equipment Required:
Vacuum Pump
Screwdriver
CAUTION:
Some internal components can be damaged by small amounts of static
electricity. A properly grounded antistatic wrist strap must be worn while handling any
internal component.
1. Wear an antistatic wrist strap that is properly connected to earth ground, see “Safety
Precautions,” earlier in this chapter for more information.
2. Remove the instrument cover.
3. Disconnect the tubing from the pressure transducer and connect a vacuum pump
known to produce a vacuum less than 1 mm Hg.
4. From the Run screen, press
MENU
to display the Main Menu. Use the
↓
pushbutton
to move the cursor to Service menu. Press
ENTER
to display the Service menu. Use
the
↓
pushbutton to move the cursor to Pressure. Press
ENTER
to display the
pressure reading.
5. Adjust the zero potentiometer on the pressure transducer for a reading of zero mm
Hg.
6. Disconnect the vacuum pump. The display should read the current local barometric
pressure. If this value does not agree with a known accurate barometer, adjust the
span potentiometer.
7. Reconnect the tubing to the pressure transducer.
8. Re-install the instrument cover.
To Next Page
Loading...
Need help?
General
