Choose vacuum pressure transmitters for measurements over the low vacuum range of 25 to 760 Torr, using an absolute or negative gauge reference vacuum range.
Use these vacuum pressure transmitters to measure partial vacuums on manufacturing processes, food packagers, autoclave sterilizers, leak testers, suction pumps and atmospheric simulators. Vacuum pressure transmitter with a 4-20mA 2 wire current loop output for measuring suction pressures relative to atmospheric pressure or absolute zero referenced pressures.
DMK457 Marine Approved Pressure Transmitter - Marine approved pressure transmitter with 4-20mA current loop output for shipbuilding with optional CuNiFe housing for sea-water compatibility
DPS200 HVAC Differential Pressure Transmitter - Differential air pressure sensor with a 10 volt or a 4-20mA output for building ventilation applications. Ranges from 0 to 6 mbar up to 0 to 1000 mbar.
DS200P Sanitary Low Range Pressure Gauge, Switch and Sensor - All in one electronic switch, gauge and sensor designed specifically for use in the food, drink and biomedical industry for measuring process pressures.
DMP331P Hygienic Flush Pressure Transmitter - Sanitary pressure sensor wth exposed diaphragm with no crevices for high temperatures up to 300 Degrees Celsius in ranges from 100mb up to 40 bar gauge or absolute
DPS Low Differential Pressure Transmitter - Ultra low differential pressure transmitter for HVAC applications with 4-20mA current loop or amplified voltage output signal in pressure ranges from 0.1 mb up to 1 bar differential. 
IMP Low Cost Pressure Sensor - Versatile low price pressure sensor with a wide selection of electrical and mechanical options for customisation.
DPS300 User Switchable Pressure Range, Volts or Current Output Low DP Sensor - The DPS 300 is a low range HVAC differential pressure sensor. The lowest possible pressure range is 0...100 pascals. 2 or 3 switchable pressure ranges, plus volts or current output are included with most standard configurations.
LEO3 Current or Digital Output Pressure Gauge - LCD digital pressure gauge powered externally by a 2 wire series 4-20mA current loop or a digital interface.
XMPi Process Plant Gauge and Absolute Pressure Transmitter - Process transmitter for measuring vacuum, steam, food, pharmaceutical, oil, gas and other pressure readings necessary for the monitoring and control of bulk production processes.
DMP343 Low Range Pneumatic Pressure Sensor - DMP343 pneumatic pressure sensor for measuring very low range pressures on pneumatic control systems, heating, ventilation and air conditioning systems (HVAC) .
DS210 Combined Low Pressure Switch, Indicator and Sensor - Low range three in one pressure switch, pressure indicator and pressure sensor for use on pneumatics and HVAC applications.
DMP331i High Accuracy Pressure Transmitter - High precision pressure transmitter with an accuracy of 0.1%FS BSL NLHR and digitally adjustable pressure ranges from 400mb up to 40 bar gauge & absolute.
- ATEX approved negative 10 mbar vacuum pressure transmitter
- Vacuum suction sensor & wall mount digital readout with switched contacts
- Vacuum pump inlet to outlet differential pressure sensor with 1500 Torr range
- -760mmHg to +20 kg/cm² pressure transmitter with HART coms
- Dredging vacuum pressure Transmitter
- Air scrubber 10 inH2O negative pressure transmitter
- Waste toner dust extraction vacuum transmitter with 1000 mbar range
- Landfill biogas extraction well depressure pressure transmitter
Find out more about Vacuum Pressure Transmitters to determine which product options and capabilities will best meet your application requirements.
The effective measurement and control of sub-atmospheric conditions are critical in numerous industrial and research settings, and vacuum pressure transmitters designed for the low vacuum range, specifically from 25 to 760 Torr, address these precise requirements. These instruments are engineered to provide accurate readings by utilizing either an absolute pressure reference, which measures against a perfect vacuum (zero pressure), or a negative gauge pressure reference, which measures downwards from the current ambient atmospheric pressure. The choice between an absolute or negative gauge reference is a crucial specification, heavily dependent on the application’s sensitivity to atmospheric pressure variations and the nature of the vacuum being monitored, whether it’s a controlled environment or a suction force.
For instance, when measuring pressures relative to absolute zero, these transmitters offer a stable and unchanging reference point, crucial for processes where the true vacuum level, independent of barometric fluctuations, is paramount. This is particularly vital in atmospheric simulation chambers where specific sub-atmospheric conditions must be precisely replicated, or in research applications demanding high fidelity vacuum data. Conversely, negative gauge vacuum pressure transmitters are ideal for monitoring suction pressures, such as the inlet of a vacuum pump or a material handling system relying on vacuum grippers. In these scenarios, the key parameter is the pressure difference relative to the surrounding atmosphere, indicating the strength of the vacuum pull.
The operational range of 25 to 760 Torr (approximately 33 to 1013 mbar) covers a significant portion of what is considered “low vacuum” or “rough vacuum.” This range is encountered in diverse applications. In manufacturing, these transmitters are integral to processes like vacuum forming, where controlled vacuum levels shape thermoplastic materials, or in vacuum drying systems that gently remove moisture at reduced pressures. Food packaging lines utilize them extensively for Modified Atmosphere Packaging (MAP) and vacuum sealing, ensuring product freshness and extending shelf life by carefully controlling the residual air and composition within the package.
Autoclave sterilizers, critical in medical and laboratory environments, rely on precise vacuum cycles. Vacuum pressure transmitters monitor the pre-vacuum phase, ensuring effective air removal from the chamber and porous loads for optimal steam penetration, and subsequently, the post-vacuum phase for thorough drying of sterilized items. In quality control, these instruments form the core of leak testing equipment, where a sealed component is evacuated, and the transmitter monitors for any pressure rise that would indicate a leak, quantifying the leak rate based on the change in vacuum over time. Similarly, they are used to assess the performance and efficiency of suction pumps, providing vital data on achievable vacuum levels and operational health.
The industry-standard 4-20mA 2-wire current loop output is a common feature for these vacuum pressure transmitters, facilitating seamless integration into existing industrial control systems, PLCs, and data acquisition units. This robust signal transmission method is well-suited to industrial environments, providing reliable and noise-immune communication of vacuum levels for process control, monitoring, and alarm generation. The scaling of this analog signal will correspond directly to the calibrated vacuum range of the transmitter, whether it’s indicating a deeper vacuum (closer to 25 Torr) or conditions nearer to atmospheric pressure (760 Torr). Careful selection ensures that the transmitter’s range, reference type, and output signal align perfectly with the specific demands of the vacuum measurement task.
Product Help
Specifying vacuum pressure transmitter requirements
Some questions to ask when defining the product requirements for a vacuum pressure transmitter.
Vacuum range
What range of vacuum do you need to measure, is it over the whole range from atmospheric pressure to a high vacuum, or a partial vacuum such as reducing the pressure to 90% atmospheric pressure?
Reference type
Are you measuring vacuum relative to full vacuum reading, which would need an absolute reference, or are you measuring vacuum relative to atmospheric pressure, which would require a gauge reference?
Current output type
What current output scaling is required for the vacuum transmitter signal, e.g. 4-20mA, 0-20mA?
Accuracy
How accurate does the vacuum reading need to be in % of full range or vacuum units such as mbar, Torr, inHg, mmHg or psi?
Electrical connection
Do you have a preferred way of connecting the current output signal to your vacuum measurement instrumentation?
Do you need a connector or a cable supplied with the transmitter?
Media type
What is the vacuum medium being measured? A vacuum measurement application often involves the removal of air, but it can involve any type of gas, and this may affect the suitability of materials used in the construction of the transducer, so it is an important consideration to ensure the long term reliability of the vacuum pressure transmitter.
Process connection
Do you have a preferred vacuum connection for mounting the transmitter? The level of vacuum being applied can influence the type of connection required, particularly high vacuums where vacuum compatible materials and vacuum seal integrity becomes more restrictive.
Checklist for vacuum pressure transmitter requirements
Define your vacuum pressure transmitter requirements using this checklist:
- Vacuum range?
- Reference type?
- Current output type?
- Accuracy?
- Electrical connection?
- Media type?
- Process connection?