MKS Baratron 121A, Instruction Manual, Page: 43 / 62

Chapter Four: Operation Warm Up and Start Up
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Chapter Four: Operation
Warm Up and Start Up
To put the Type 121 Absolute Pressure Transducer into operation, follow the steps below.
1. Plug the sensor cable into the electronics unit at the Type “D” connection (taking care
not to crimp the cable).
2. Plug the micro-ribbon cable (MKS or non-MKS supplied) into the electronics unit at the
micro-ribbon connection.
Note
The other end of the ribbon cable should be attached to an MKS (or
MKS-compatible) power supply/readout unit. Refer to Table 5, page 22,
for a list of available MKS power supply/readout units.
3. Apply power to the transducer. The power requirement is ±15 VDC (±5 %) @ 35 mA.
4. Vacuum-pump the system to a pressure below the transducer's resolution (0.01% F.S.).
Allow a minimum of 15 minutes for the electronics to stabilize.
5. Zero the output of the transducer by adjusting the zero potentiometer on the electronics
unit until the output is 0.0 Volts.
Note
If using an MKS power supply/readout unit, the transducer can also be
zeroed at the front panel of the readout unit. If using an MKS-compatible
power supply/readout unit, the transducer must be zeroed at the
electronics unit.
The instrument is ready for normal operation. For best accuracy and repeatability, check the zero
and reset as needed.