141A 0.1-1000 Torr Baratron® Absolute Pressure Switches
Overview
The 141A Absolute Pressure Switch offers fast, accurate, and reliable protection for vacuum equipment and processes. Designed for applications where a DC signal output is not required, the 141A has relay outputs that are easily interfaced with alarms, valve actuators, computers, process controllers, and other protection devices.
- Fully adjustable set point for flexibility
- All-metal, all-welded Inconel® and stainless steel construction for corrosion resistance
- Fast response switching - 20 msec
Products
| Compare | Description | Drawings, CAD & Specs | Availability | Price | |||
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141AA-00001AA Absolute Pressure Switch, 1 Torr, 0.5 in. Tube, Standard DPDT Relay | $701 |
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141AA-00001AB Absolute Pressure Switch, 1 Torr, 0.5 in. Tube, Fail Safe DPDT Relay | $701 |
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141AA-00001BA Absolute Pressure Switch, 1 Torr, 8 VCR Female, Standard DPDT Relay | $794 |
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141AA-00001BB Absolute Pressure Switch, 1 Torr, 8 VCR Female, Fail Safe DPDT Relay | $794 |
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141AA-00001DA Absolute Pressure Switch, 1 Torr, ISO-KF, Standard DPDT Relay | $794 |
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141AA-00001DB Absolute Pressure Switch, 1 Torr, NW16 ISO-KF, Fail Safe DPDT Relay | $794 |
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141AA-00010AA Absolute Pressure Switch, 10 Torr, 0.5 in. Tube, Standard DPDT Relay | $701 |
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141AA-00010AB Absolute Pressure Switch, 10 Torr, 0.5 in. Tube, Fail Safe DPDT Relay | $701 |
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141AA-00010BA Absolute Pressure Switch, 10 Torr, 8 VCR Female, Standard DPDT Relay | $794 |
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141AA-00010BB Absolute Pressure Switch, 10 Torr, 8 VCR Female, Fail Safe DPDT Relay | $794 |
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141AA-00010DA Absolute Pressure Switch, 10 Torr, NW16 ISO-KF, Standard DPDT Relay | $794 |
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141AA-00010DB Absolute Pressure Switch, 10 Torr, NW16 ISO-KF, Fail Safe DPDT Relay | $794 |
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141AA-00100AA Absolute Pressure Switch, 100 Torr, 0.5 in. Tube, Standard DPDT Relay | $701 |
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Absolute Pressure Switch, 100 Torr, 0.5 in. Tube, Fail Safe DPDT Relay
$701
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141AA-00100AB Absolute Pressure Switch, 100 Torr, 0.5 in. Tube, Fail Safe DPDT Relay | $701 |
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141AA-00100BA Absolute Pressure Switch, 100 Torr, 8 VCR Female, Standard DPDT Relay | $794 |
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Absolute Pressure Switch, 100 Torr, 8 VCR Female, Fail Safe DPDT Relay
$794
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141AA-00100BB Absolute Pressure Switch, 100 Torr, 8 VCR Female, Fail Safe DPDT Relay | $794 |
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141AA-00100DA Absolute Pressure Switch, 100 Torr, NW16 ISO-KF, Standard DPDT Relay | $794 |
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141AA-00100DB Absolute Pressure Switch, 100 Torr, NW16 ISO-KF, Fail Safe DPDT Relay | $794 |
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Absolute Pressure Switch, 1000 Torr, 0.5 in. Tube, Standard DPDT Relay
$701
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141AA-01000AA Absolute Pressure Switch, 1000 Torr, 0.5 in. Tube, Standard DPDT Relay | $701 |
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Absolute Pressure Switch, 1000 Torr, 0.5 in. Tube, Fail Safe DPDT Relay
$701
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141AA-01000AB Absolute Pressure Switch, 1000 Torr, 0.5 in. Tube, Fail Safe DPDT Relay | $701 |
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Absolute Pressure Switch, 1000 Torr, 8 VCR Female, Standard DPDT Relay
$794
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141AA-01000BA Absolute Pressure Switch, 1000 Torr, 8 VCR Female, Standard DPDT Relay | $794 |
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Absolute Pressure Switch, 1000 Torr, 8 VCR Female, Fail Safe DPDT Relay
$794
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141AA-01000BB Absolute Pressure Switch, 1000 Torr, 8 VCR Female, Fail Safe DPDT Relay | $794 |
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141AA-01000DA Absolute Pressure Switch, 1000 Torr, NW16 ISO-KF, Standard DPDT Relay | $794 |
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Absolute Pressure Switch, 1000 Torr, NW!6 ISO-KF, Fail Safe DPDT Relay
$794
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141AA-01000DB Absolute Pressure Switch, 1000 Torr, NW!6 ISO-KF, Fail Safe DPDT Relay | $794 |
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Configuration Options
The following options are available for the 141 Baratron® Vacuum Pressure Switch.
Ordering Code Example: 141AA-00001A
| Configuration Option | Option Code |
|---|---|
| 141 Vacuum Pressure Switch | 141AA |
| 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 TemperatureAmbient
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Accuracy±0.5% of Full Scale Range (± temperature coefficients)
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Zero Temperature Coefficient±0.04% of Full Scale/°C
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Span Temperature Coefficient±0.06% of set point/°C
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Operating Temperature Range0° to 50°C
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Response Time< 20 msec from 0 to Full Scale
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Relay Contact RatingsDPDT, 2 amps @ 30 VDC or 1 amp @ 120 VAC resistive
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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)
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Power Requirements20 to 30 VDC, 72 mA
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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.
Resources
Literature
- Baratron® Vacuum Pressure Switches (156.4 kB, PDF)
Manuals
- 141A/142A Baratron® Vacuum Switch Manual (424 kB, PDF)
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