Setup
Chapter Two: Installation
26
Figure 4: Location of the Zero Pot on Transducer Endcaps
To properly zero a transducer, follow this procedure:
1. Install the transducer a system with a power supply/readout.
2. Power the transducer and allow it to warm up. Warm up time is 15 minutes.
3. Pump the unit down to a pressure below its resolution (refer to Table 6 for recommended
pressure levels).
4. Using a small screwdriver, adjust the ZERO pot until the readout displays zero (0000).
Highest Pressure Suggested for Proper Zero Adjustment
Full Scale Range (Torr)
Highest Pressure for Zero Adjustment (Torr)
0.1*
< 5 x 10
-6
0.25*
< 5 x 10
-6
1
< 5 x 10
-5
2
< 1 x 10
-4
10
< 5 x 10
-4
100
< 5 x 10
-3
1000
< 5 x 10
-2
* Only available with Type 626D transducer
Table 6: Highest Pressure Suggested for Proper Zero Adjustment
Coarse Zero Adjustment
Some ranges of the 600 Series transducers provide additional zero range capability through the
coarse zero adjustment feature. Please contact MKS applications for specific ranges and help on
making this adjustment. The zero potentiometer provides ample control under normal conditions.
