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1-1 GENERAL INFORMATION AND SAFETY PRECAUTIONS. Warnings and precautions appear
throughout the text of this manual to identify procedures or precautions that if not followed, may result in injury to
personnel or damage equipment. Technicians should become thoroughly familiar with these warnings and cautions
before servicing or repairing the pressure transducer.
1-2 INTRODUCTION. This technical manual provides information from general descriptions to calibration,
maintenance and installation procedures for the Model 742R pressure transducers (Figure 1-1) and Model 742D
differential pressure transducers (Figure 1-2). Information contained in the manual includes:
a.
b.
c.
d.
e.
f.
1-3 EQUIPMENT DESCRIPTION. The Model 742R, 742C or 742V pressure transducer (hereafter referred
to as pressure transducer) is a piezoresistive strain gage transducer which accepts a fluid pressure input and produces
an electrical DC current output (or DC voltage, depending on option) that is proportional to the applied pressure.
Input pressure ranges vary depending on the model of the transducer. Each pressure transducer consists of a
piezoresistive strain gage sensor/electronics assembly, a RFI board assembly, a housing and connector assembly. An
access cover permits the adjustment of the ZERO and SPAN limits of the pressure transducer output. Connection of
the input pressure source is in accordance with MS16142 utilizing 1/4 inch O.D. tubing. Connection to the pressure
transducer's output is a MS3452Wl4S-5P and MS3456Wl4S-5S connector pair supplied with the pressure transducer
in accordance with MIL-T-24742(SH).
The Model 742D differential pressure transducer (hereafter referred to as differential pressure transducer) is a
piezoresistive strain gage transducer which accepts a differential fluid pressure input and produces an electrical DC
current output (or DC voltage, depending on option) that is proportional to the applied differential pressure. Input
differential pressure ranges vary depending on the model of the transducer. Each pressure transducer consists of a
piezoresistive strain gage sensor/electronics assembly, a RFI board assembly, a housing and connector assembly. An
access cover permits the adjustment of the ZERO and SPAN limits of the pressure transducer output. Connection of
the input pressure source is in accordance with MS16142 utilizing 1/4 inch O.D. tubing. Connection to the pressure
transducer's output is a MS3452Wl4S-5P and MS3456Wl4S-5S connector pair supplied with the pressure transducer
in accordance with MIL-T-24742(SH).
1-1
GENERAL INFORMATION AND SAFETY PRECAUTIONS
Physical and Functional Descriptions
Safety Precautions
Operating Procedures
Scheduled (Preventive) and Corrective Maintenance Procedures
Troubleshooting Procedures
Installation Information
CHAPTER 1
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