Brooks Instrument 5866M - Manual (Page 38)

6-1
Calibration
Calibration
6-1 Calibration Procedure
The calibration of the Model 5866 Pressure Controller can be divided into
three parts: Transducer Adjustment, Control Valve Adjustment and Control
Electronics Adjustment. The control valve adjustment and sizing
procedures are given in Sections 5-5 and 5-6 respectively. The
adjustment of the control electronics is best done in the actual system the
Model 5866 will be installed in and this procedure is covered in Section 3-2.
This section of the manual will cover the calibration of the pressure
transducer. Please refer to the above sections of the manual if the control
valve or control electronics require adjustment.
Note: Calibration of the Model 5866 Pressure Controller requires the use
of a precision pressure and vacuum source, precision pressure indicators
and a digital voltmeter (DVM). The calibration may also involve high
pressure. It is recommended the calibration procedure be performed by
qualified personnel.
Excessive pressure can damage the pressure transducer and make
it inoperative. Care must be taken not to allow the pressure
transducer to be exposed to more than the maximum over-range
pressure. The maximum over-range pressure is specific to the range
of the pressure transducer. These pressures are listed in Section
1-4 of this manual.
CAUTION
Refer to Figures 1-9 and 1-10 for locations for the adjustment
potentiometers, jumpers and D-Connector pins.
1. Connect power to the instrument and allow it to warm up for
approximately 15 minutes.
2. Connect the DVM positive lead to the +5 Volt reference output (Pin 11)
and the DVM negative lead to signal ground (Pin 10). Adjust the +5 Volt
reference output to 5.000 V using P1.
3. Connect the DVM positive lead to the pressure signal output (Pin 2) and
the negative lead to signal ground (Pin 10). Connect the transducer
side of the Model 5866 to a vacuum source capable of achieving an
absolute pressure less than 0.02 psia (1 Torr). Put a cap or some
suitable plug on valve side inlet. Attaching the transducer side of the
Model 5866 to a mass spectrometer type helium leak detector is a good
way to achieve a suitable vacuum. Adjust the signal output to 0.000 V
using zero potentiometer, P4.
6
Section