142A 1-1000 Torr Heated (100°C) Baratron® Absolute Pressure Switches
Overview
The 142A Absolute Ambient Pressure/Vacuum Switch offers fast, accurate, and reliable protection for vacuum equipment and processes. The 142 is a 100°C heated manometer designed to help minimize process effluent buildup that can occur in LPCVD nitride, aluminum etch, and other types of processes. The 142A has relay outputs that are easily interfaced with alarms, valve actuators, computers, process controllers, and other protection devices.
- Heated to minimize process effluent buildup
- Fully adjustable set point for flexibility
- All-metal, all-welded construction exposes only Inconel® and stainless steel for corrosion resistance
- Fast response switching - 20 msec
Products
| Compare | Description | Drawings, CAD & Specs | Availability | Price | |||
|---|---|---|---|---|---|---|---|
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142AA-00001AA Absolute Pressure Switch, 1 Torr, 100C, 0.5 in. Tube, Standard DPDT | $1,054 |
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Absolute Pressure Switch, 1 Torr, 100C, 0.5 in. Tube, Fail Safe DPDT
$1,054
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142AA-00001AB Absolute Pressure Switch, 1 Torr, 100C, 0.5 in. Tube, Fail Safe DPDT | $1,054 |
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142AA-00001BA Absolute Pressure Switch, 1 Torr, 100C, 8 VCR, Standard DPDT Relay | $1,147 |
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142AA-00001BB Absolute Pressure Switch, 1 Torr, 100C, 8 VCR, Fail Safe Relay | $1,147 |
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142AA-00001DA Absolute Pressure Switch, 1 Torr, 100C, NW16 ISO-KF, Standard DPDT | $1,147 |
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142AA-00001DB Absolute Pressure Switch, 1 Torr, 100C, NW16 ISO-KF, Fail Safe DPDT | $1,147 |
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Absolute Pressure Switch, 10 Torr, 100C, 0.5 in. Tube, Standard DPDT
$1,054
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142AA-00010AA Absolute Pressure Switch, 10 Torr, 100C, 0.5 in. Tube, Standard DPDT | $1,054 |
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Absolute Pressure Switch, 10 Torr, 100C, 0.5 in. Tube, Fail Safe DPDT
$1,054
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142AA-00010AB Absolute Pressure Switch, 10 Torr, 100C, 0.5 in. Tube, Fail Safe DPDT | $1,054 |
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142AA-00010BA Absolute Pressure Switch, 10 Torr, 100C, 8 VCR, Standard DPDT Relay | $1,147 |
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Absolute Pressure Switch, 10 Torr, 100C, 8 VCR, Fail Safe DPDT Relay
$1,147
|
142AA-00010BB Absolute Pressure Switch, 10 Torr, 100C, 8 VCR, Fail Safe DPDT Relay | $1,147 |
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142AA-00010DA Absolute Pressure Switch, 10 Torr, 100C, NW16 ISO-KF, Standard DPDT | $1,147 |
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Absolute Pressure Switch, 10 Torr, 100C, NW16 ISO-KF, Fail Safe DPDT
$1,147
|
142AA-00010DB Absolute Pressure Switch, 10 Torr, 100C, NW16 ISO-KF, Fail Safe DPDT | $1,147 |
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Absolute Pressure Switch, 100 Torr, 100C, 0.5 in. Tube, Standard DPDT
$1,054
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142AA-00100AA Absolute Pressure Switch, 100 Torr, 100C, 0.5 in. Tube, Standard DPDT | $1,054 |
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Absolute Pressure Switch, 100 Torr, 100C, 0.5 in. Tube, Fail Safe DPDT
$1,054
|
142AA-00100AB Absolute Pressure Switch, 100 Torr, 100C, 0.5 in. Tube, Fail Safe DPDT | $1,054 |
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Absolute Pressure Switch, 100 Torr, 100C, 8 VCR, Standard DPDT Relay
$1,147
|
142AA-00100BA Absolute Pressure Switch, 100 Torr, 100C, 8 VCR, Standard DPDT Relay | $1,147 |
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Absolute Pressure Switch, 100 Torr, 100C, 8 VCR, Fail Safe DPDT Relay
$1,147
|
142AA-00100BB Absolute Pressure Switch, 100 Torr, 100C, 8 VCR, Fail Safe DPDT Relay | $1,147 |
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Absolute Pressure Switch, 100 Torr, 100C, NW16 ISO-KF, Standard DPDT
$1,147
|
142AA-00100DA Absolute Pressure Switch, 100 Torr, 100C, NW16 ISO-KF, Standard DPDT | $1,147 |
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Absolute Pressure Switch, 100 Torr, 100C, NW16 ISO-KF, Fail Safe DPDT
$1,147
|
142AA-00100DB Absolute Pressure Switch, 100 Torr, 100C, NW16 ISO-KF, Fail Safe DPDT | $1,147 |
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Absolute Pressure Switch, 1000 Torr, 100C, 0.5 in. Tube, Standard DPDT
$1,054
|
142AA-01000AA Absolute Pressure Switch, 1000 Torr, 100C, 0.5 in. Tube, Standard DPDT | $1,054 |
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Absolute Pressure Switch, 1000 Torr, 100C, 0.5 in. Tube, Fail Safe DPDT
$1,054
|
142AA-01000AB Absolute Pressure Switch, 1000 Torr, 100C, 0.5 in. Tube, Fail Safe DPDT | $1,054 |
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Absolute Pressure Switch, 1000 Torr, 100C, 8 VCR, Standard DPDT Relay
$1,147
|
142AA-01000BA Absolute Pressure Switch, 1000 Torr, 100C, 8 VCR, Standard DPDT Relay | $1,147 |
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Absolute Pressure Switch, 1000 Torr, 100C, 8 VCR, Fail Safe DPDT Relay
$1,147
|
142AA-01000BB Absolute Pressure Switch, 1000 Torr, 100C, 8 VCR, Fail Safe DPDT Relay | $1,147 |
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Absolute Pressure Switch, 1000 Torr, 100C, NW16 ISO-KF, Standard DPDT
$1,147
|
142AA-01000DA Absolute Pressure Switch, 1000 Torr, 100C, NW16 ISO-KF, Standard DPDT | $1,147 |
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|||
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Absolute Pressure Switch, 1000 Torr, 100C, NW16 ISO-KF, Fail Safe DPDT
$1,147
|
142AA-01000DB Absolute Pressure Switch, 1000 Torr, 100C, NW16 ISO-KF, Fail Safe DPDT | $1,147 |
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Configuration Options
The following options are available for the 142A Baratron® Vacuum Pressure Switch.
Ordering Code Example: 142AA-00001A
| Configuration Option | Option Code |
|---|---|
| 142A Heated Vacuum Pressure Switch | 142AA |
| Full Scale Range | |
| 1 Torr | 00001 |
| 2 Torr | 00002 |
| 10 Torr | 00010 |
| 100 Torr | 00100 |
| 1000 Torr | 01000 |
| Fittings | |
| 1/2 in. OD Tube | A |
| Swagelok 8 VCR female | B |
| Mini-CF, rotatable | C |
| NW16 ISO-KF | D |
| Swagelok 8 VCO female | E |
| Relay Mode | |
| Standard operation (energizes above set point) | A |
| Fail-safe operation (energizes below set point) | B |
Specifications
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TypePressure Switch
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Measurement TypeAbsolute
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Full Scale Pressure Ranges1, 2, 10, 100, 1000 Torr (mmHg) absolute
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Set Point Range0.2% to 100% of Full Scale
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Sensor TemperatureTemperature Controlled at 100°C
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Accuracy±0.5% of range (± temperature coefficients)
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Zero Temperature Coefficient±0.015% of Full Scale/°C
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Span Temperature Coefficient±0.03% of set point/°C
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Operating Temperature Range20° to 70°C
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Response Time< 20 msec from 0 to Full Scale
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Internal Volume7.0 cc (5K-25K Torr units have an 8.5 cc volume)
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Overpressure120% of Full Scale or 35 psia (1000 mmHg), whichever is larger
(1 and 2 Torr Full Scale units have a max. overpressure of 25 psia) -
Power Requirements20 to 30 VDC, 1.2 A max. (875 mA @ 24 VDC)
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ComplianceCompliant to EMC Directive 2014/30/EU
Features
Baratron® Capacitance Manometer Technology
Capacitance manometers are electro-mechanical gauges that can measure both pressure and vacuum. The capacitance gauge translates a pressure-modulated movement in a thin diaphragm into an electrical signal proportional to the pressure. The pressure sensor is the thin diaphragm that is exposed to the pressure or vacuum being measured via the inlet tube. An electrode is mounted in the reference cavity behind the diaphragm. Pressure differences between the process and the reference cavity deflect the diaphragm slightly, changing the distance between it and the electrode. Variations in this distance produce variations in the capacitance between the diaphragm and the electrode creating an electrical signal that is proportional to the pressure change. Since differences in the capacitance signal are produced by physical changes within the manometer and not by changes in the gas properties, pressure measurements by the capacitance manometer are independent of the composition of the gas being measured.
Capacitance manometer sensor schematic showing the internal components
Fully Adjustable Set Point
The high accuracy set point can be adjusted from from 0.2% to 100% of Full Scale for tripping the switches relay. An LED provides visual ''above set point'' indication, and facilitates adjustment of the set point.
Inconel® and Stainless Steel Construction
The dual electrode sensor is an all-metal, all-welded design, thus exposing only corrosion-resistant Inconel® and stainless steel to the process gases.
Absolute Pressure Switching
The 141A and 142A pressure switches are referenced to vacuum for absolute pressure trip point switching. Applications for absolute pressure switches include soft pumping, gas box switching, and safety interlocks.
DPDT Relay
A double pole double throw relay rated at 2 amps @ 30 VDC or 1 amp @ 120 VAC resistive provides the set point switching. The relay is energized when pressure is above set point. Fail-safe operation provides for the relay to be energized when pressure is below set point.
Internally Heated to 100°C
These capacitance manometers are internally heated for improved accuracy. Unheated versions are exposed to ambient temperature variations which can degrade the sensor accuracy. These devices have the sensor enclosed in a volume that is maintained at a constant temperature above ambient. This solution improves the manometer’s accuracy and repeatability and lowers instrument drift by reducing or eliminating process contamination within the manometer. Heated manometers are recommended for applications that require maximum accuracy and repeatability, operate above ambient temperature and for those processes that employ hot gases.
Resources
Literature
- Baratron® Vacuum Pressure Switches (156.4 kB, PDF)
Manuals
- 141A/142A Baratron® Vacuum Switch Manual (424 kB, PDF)
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