Electrical pressure sensors
For precise flow measurements of differential pressure methods it is necessary to measure the differential pressure above the flow element exactly. In addition, the static pressure, temperature and, if necessary, air humidity should be recorded for an accurate determination of the density of the medium.
For this we offer – depending on the tasks – different types with different measuring ranges for pressure and differential pressure as single sensors, and also the combined pressure/differential pressure sensor PDP. High precision, fast response time and, first of all, overload resistance which is fundamental in practice, are important selection criteria.
PDP – Combined pressure sensor
Sensors of the series PDP are combined sensors for differential pressure and static pressure. They are particularly suitable for flow measurement with Laminar Flow Elements in connection with the S320 Controller for signal conditioning.
PDP combined pressure sensors have an extremely overload capacitive differential pressure measuring cell as well as a piezoresistive sensor for static pressure. The capacitive differential pressure cell and the piezoresistive pressure sensor in the PDP sensor stand out thanks to very fast response times, very good reproducibility, low hysteresis and good zero point stability.
| Properties | Functions |
|---|---|
| Sensor type und meas. range | |
| Differential pressure | 1 / 2 / 10 / 20 mbar |
| Gauge pressure | 0.07 / 0.35 / 1 / 2 / 4 / 7 bar |
| Absolute pressure | 1 / 2 / 4 / 7 bar |
| Linearity | diff. pressure sensors typ. ±0.5 % FS rel. pressure sensors typ. ±0.1 % FS abs. pressure sensors typ. ±0.1 % FS |
| Repeatability | ±0.05 % FS |
| Hysteresis | ±0.05 % FS |
| Overpressure | |
| Differential pressure sensors | 6 bar static or as a one-sided overpressure on the plus side and 5x FS as a one-sided overpressure on the minus side |
| Gauge-/Absolute pressure sensors | 2x FS, max. 6 bar |
| Process connections | |
| Slip-on enclosure | 2 x 1/4"f NPT, brass, nickel-plated |
| Flange enclosure | 2 x G 1/4“f, brass, nickel-plated |
| Electr. connections (output) | 2 x voltage (-2 .. +2 V) or 2 x current (4 .. 20 mA) |
| Media compatibility | clean, dry, non-condensing, non-corrosive, non-flammable gases and air |
| Supply | 24 VDC (19 bis 29 VDC), ca. 30 mA (RS485: ≈ 50 mA) |
Main features
- Combined measurement: differential and static pressure
- Differential pressure measuring range 1 up to 20 mbar
- Static pressure measuring range of 70 mbar up to 7 bar
- Bidirectional differential pressure measurement (option)
- TTI differential pressure sensor can be directly flange-mounted
- Media: air and inert gases up to 6 bar
- Voltage or current output
- Response behaviour (analog): T90: approx. 5 ms
TO DO: Main features
- capacitativ measurement
- precise and fast measurements
- Measuring ranges ± 1 / 2 / 10 / 20 mbar
- high overload resistance
- Process-safe adaptation by flange housing
- reduced internal volume
- fast response to pressure changes
- bi-directional operation
- Media: air, inert gases, non-condensing
- incl. 5-Point calibration log
DPS.flange: analog differential pressure sensor
The DPS.flange is a purely analog differential pressure sensor and offers exceptional features in a practical flange housing. This ensures process-safe tightness in the adaptation of the sensor. The high overload resistance and the extremely fast reaction to pressure changes, as well as the reduced internal volume make it particularly interesting for leak test applications.
| Properties | Functions |
|---|---|
| Measurment range | ± 1 / 2 / 10 / 20 mbar |
| Accuracy | typ. 0.75 % FS |
| Repeatability | typ. 0.010 % FS |
| Hysteresis | typ. 0.012 % FS |
| Overload limits | 6 bar from plus to minus side 3x FS from minus to plus side |
| Process connection | Flange with O-Ring or Screw connection with M3 thread |
| Electr. connection (output) | M8, 4-pol. (-2...2 V) |
| Temperature range | +15...+45 °C |
| Material | Aluminium / ceramic |
| Media compatibility | Air, inert gases, non-condensing |
| Power supply | 24 VDC |
3051S – HART Pressure sensor for static and differential pressure
The model 3051S with HART protocol is a very precise and at the same time pressure-resistant transmitter for difference, gauge or absolute pressure measurements and it is suitable for liquids, gases or vapors. A LCD digital indicator is available optionally.
The measuring range of the 3051S to the 4 up to 20 mA current signal can be freely adjusted by a HART communicator. The capacitive sensor of the 3051S is isolated from the medium with a stainless steel separating diaphragm and oil filling. It has an enormously high overpressure resistance of 100 bar and more loading capacity particularly at differential pressure due to the oil filling and installed protective mechanisms.
| Properties | Functions |
|---|---|
| Sensor type and measuring range | Differential pressure 0,25...138 mbar Gauge pressure 0...138 bar Absolute pressure 0...276 bar |
| Accuracy | ±0.025% FS - ±0,1% FS (depends on actual range ) |
| Overload | 100 bar |
| Process connection | 1/4"f NPT flange |
| Electr. connection (output) | Connecting terminals in the interior |
| Media compatibility | Air, gases, liquids, vapor also corrosive/aggressive |
Main features
- Differential, gauge, absolute pressure measurement
- HART-protocol
- adjustable with HART-communicator
- high overload resistance
- Accuracy: < 0.1 % of full scale with 16 bit resolution
- optional with LCD display (Plant Web)
- Keys for Span and Zero (Plant Web)
- Measuring range: bidirectional, continuously adjustable
- Media: Gases, liquids, vapor
- further versions are available
Main features
- Gauge or absolute pressure measurement
- Measuring ranges of 100 mbar up to 100 bar
- From 25 bar up to 1000 bar sealed gauge
- Linearity better ±0.1 % F.S.
- Response behaviour (analog): T90 < 1 ms
- Zero and Gain adjustable
- Media: gases, liquids, vapour
- Current or voltage output
- Medium temperatures up to 150 °C (optional)
ATM: analog pressure sensor
The ATM is a universal, analog pressure sensor for gauge pressure, over pressure or absolute pressure measurements. It is available in various types, measuring ranges and accuracy classes. The sensor is available with voltage or current output and different electrical versions as well as pressure connections.
The ATM series is based on a fast piezoresistive sensor, which is isolated from the measured medium by a stainless steel isolating diaphragm and oil filling. Due to its robust and compact design they are also suitable for the use under adverse conditions.
| Properties | Functions |
|---|---|
| Sensor type and range | Gauge / Absolute -1...100 / 0...100 bar |
| Accuracy | ±0.5 %, ±0.25 %, ±0.1 % FS |
| Repeatability | ±0.05 % FS |
| Hysteresis | ±0.05 % FS |
| Overpressure | 3 bar, max. 3x FS |
| Process connections | G 1/4 F, G1/4 M, 1/4 NPT M, G 1/2 M |
| Electr. connections (output) | DIN-43650, M12x1 4-pol., M16 5-pol. 0...10 V oder 4...20 mA |
| Temperature range | 0...70 °C, -40...150 °C |
| Material | Stainless steel / Titanium / Hastelloy |
| Media compatibility | Gases, fluids, steam |
| Power supply | 24 VDC (9 to 33 VDC), ca. 3 mA |
M1500 – digital pressure transmitter
The digital pressure transmitter M1500 is a highly accurate pressure control system based on microprocessors for the measurement of differential, gauge or absolute pressures with an accuracy of better than ±0.025 % F.S on the digital interface.
M1500 digital pressure transmitters are available with various interfaces and optionally also with an analogue output. The digital interface enables the configuration and retrieval of data via PC as well as the networking of transmitters (RS485). The digital interface of the analogue output version supports only the configuration of the transmitter.
| Properties | Functions |
|---|---|
| Sensor type und measuring range: | |
| Differential pressure | 0...5000 mbar |
| Gauge pressure | -1...200 bar |
| Absolute pressure | 0...70 bar |
| Linearity | Diff. pressure: typ. ±0.025 % FS Gauge pressure: typ. ±0.1 % FS Absolute pressure: typ. ±0.1 % FS |
| Repeatability | ±0.05 % FS |
| Hysteresis | ±0.05 % FS |
| Overload limits | |
| Differential pressure sensors: | 2x FS as one-sided overpressure on the plus side and 10 bar static, if this rests on both sides |
| Gauge-/absolute pressure sensors: | Double measuring range-end value |
| Process connection | |
| Slip-on enclosure: | 2 x 1/4"f NPT, brass, nickel-plated |
| Flange enclosure: | 2 x G 1/4“f, brass, nickel-plated |
| Electr. connections (output) | 2 x voltage (-2 .. +2 V) or 2 x current (4 .. 20 mA) or 1 x serial Data (RS485) |
| Media compatibility | Clean, dry, non-corrosive, non-flamable gases and air |
| Power supply | 24 VDC (17 bis 32 VDC) |
Main features
- Differential, gauge or absolute pressure measurement
- Measuring ranges of 25 mbar up to 200 bar
- Accuracy better ±0.025 up to ±0.1 % F.S.
- Digital interfaces: RS-232, RS-485 or USB
- Temperature-compensated of -10 up to 50°C
- Media: air, gases and liquids
- Network operation of up to 32 transmitters (RS-485)
- MSP Meriam Serial Protocol