Chapter One: General Information
Introduction
17
Chapter One: General Information
Introduction
The MKS Type PDR-C-1C and PDR-C-2C are power supply and digital readouts which are
packaged in standard half-rack mount units. The PDR-C-2C is designed to provide power for,
and accept the outputs from two pressure sensors. The PDR-C-1C is identical to the -2C except
the -1C is designed for operation with one pressure sensor.
The power supply for both the -1C and -2C is capable of providing ±15 VDC at up to 600 mA.
This will provide enough power for two MKS Baratrons, including those listed in Table 5, or for
any electronic manometer with similar input requirements.
Baratron Transducers Supported by the PDR-C Readouts
121
223
624
122
224
625
124
422
626
127
427
627
128
622
628 (only one)
221
623
722
Table 5: Baratron Transducers Supported by the PDR-C Readouts
The unit contains two set point-operated, single pole relays which may be controlled by either
pressure channel in the -2C. Set point adjustment is accomplished by front panel COARSE and
FINE controls which cover the entire range of the gauge in use. The relays’ status is indicated by
front panel lamps. “Failsafe” relay operation is standard, that is, the relays are not energized at
pressures higher than the set point settings. The relays can be latched in the energized state by
means of an external logic line to the rear panel Interface connector.
The readout is a 4½ place digital panel meter which indicates the output of the attached pressure
sensor(s). Engineering units for the readout (mmHg, psi, kPa, mbar, inHg, inH
2
O, cmH
2
O) can be
selected by a front panel switch. The meter also reads the current set point values in the same
engineering units by means of another front panel switch. The PDR-C-2C has an additional front
panel switch which is used to select display of channel 1, display of channel 2, remote channel
selection, or automatic channel selection. In automatic channel selection, the PDR-C-2C will
display Channel 1 sensor as long as it is less than 100%. If Channel 1 is greater than 100%,
Channel 2 will be displayed.
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