Chapter One: General Information Introduction
5
Chapter One: General Information
Introduction
The MKS Type 41A/42A/51A/52A Mini Vacuum Pressure Switch is based on the proven Type
700/800 Series mini Baratron
capacitance manometer technology. The small footprint of the
41/42/51/52 pressure switch makes it ideal for applications with limited space. The switches are
available in a single-ended or flow-through configuration, using either an absolute or gage
transducer. Table 2 lists the various configurations available. Table 3 lists the features available
on the single-ended (41 and 51) and flow-through versions (42 and 52).
Description of the 41/42/51/52
Mini Vacuum Pressure Switch
Model Type Description
41 Single-Ended Gage Transducer
51 Single-Ended Absolute Transducer
42 Flow-Through Gage Transducer
52 Flow-Through Absolute Transducer
Table 2: Description of the 41/42/51/52 Mini Vacuum Pressure Switch
Configuration Options of the Single-Ended and Flow-Through Versions
Feature Single-Ended (41 and 51) Flow-Through (42 and 52)
Connector 9-pin Type “D” or flying leads 9-pin Type “D” or flying leads
Fittings 4-VCR fixed male, ¼” NPT male,
¹/
8
” NPT male, or KF-16
Swagelok
®
4-VCR fixed male
Full Scale Range 10 Torr to 25000 Torr (500 psi)
1000 Torr (
≈
20 psi) to 500 psi
Table 3: Configuration Options of the Single-Ended and Flow-Through Versions
The pressure switch output signal changes state when the measured pressure crosses a trip point
pressure value. The trip point pressure value is selected at the time the unit is ordered and the
value set at the factory. The trip point direction, whether to trip when the pressure rises above or
drops below the trip point value, is also defined when the unit is ordered. The pressure switch
arrives fully configured so all you need to do is install it into your system.
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