Pressure gauges with output signals combine the benefits of a mechanical pressure gauge's analogue indication, which requires no extra power, with a pressure transmitter's electrical output signal. These hybrid instruments can be used with any of the most popular electrical signals. The sensor's non-contact operation has no impact on the measurement signal. Many of the instruments can be offered with an Ex I intrinsically safe ignition protection type in line with ATEX.
Output signal 4 ... 20 mA for the transmission of process values to the control room
Easy-to-read, analogue on-site display needing no external power
Process industry: Chemical industry, petrochemical industry, oil and gas, power generation, water and wastewater
No configuration necessary due to "plug-and-play"
Signal transmission per NAMUR
Measuring ranges 0 ... 0.6 bar to 0 ... 1,600 bar
Easy-to-read analogue display with nominal size 100 or 160
Safety version S3 per EN 837
Wherever the process pressure has to be indicated locally and, at the same time, a signal transmission to the central control or remote centre is desired, the model PGT23 intelliGAUGE®(patent, property right: e.g. DE 202007019025) can be used.
Through the combination of a mechanical measuring system and electronic signal processing, the process pressure can be read securely, even if the voltage supply is lost.
The intelliGAUGE model PGT23 fulfils all safety-related requirements of the relevant standards and regulations for the on-site display of the working pressure of pressure vessels. An additional measuring point for mechanical pressure display can thus be saved. The model PGT23 is based upon a model 23X.30high-quality, stainless steel safety pressure gauge.
The all welded and robust Bourdon tube measuring system produces a pointer rotation proportional to the pressure. An electronic angle encoder, proven in safety-critical automotive applications, determines the position of the pointer shaft – it is a non-contact sensor and therefore completely free from wear and friction. From this, the electrical output signal proportional to the pressure, 4 … 20 mA, is produced.
The electronic WIKA sensor, integrated into the high-quality pressure gauge, combines the advantages of electrical signal transmission with the advantages of a local mechanical display.
The measuring span (electrical output signal) is adjusted automatically along with the mechanical display, i.e. the scale over the full measuring range corresponds to 4 … 20 mA.
General machine building
USB interface for measured-value display on the PC
Non-contact sensor (wear-free)
Nominal size 50
Scale ranges 0 ... 1,6 bar to 0 ... 400 bar
Design EN 837-1
Scaleranges 0 ... 1.6 to 0 ... 400 bar or all other equivalent vacuum or combined pressure and vacuum ranges
Pressurelimitation Steady: 3/4 x full scale value Fluctuating: 2/3 x full scale value Short time: Full scale value
Permissibletemperature Ambient: -20 … +60 °C Medium: +60 °C maximum
Temperatureeffect When the temperature of the measuring system deviates from the reference temperature (+20 °C): max. ±0.4 %/10 K of the span
Processconnection Copper alloy, lower mount (LM) G 1/4 B (male), 14 mm flats
Pressureelement Copper alloy, C-type
Movement Copper alloy
Dial Plastic, white, black lettering
Pointer Plastic, black
For dry gaseous and liquid media that are not highly viscous or crystallising and are suitable for copper alloy parts
Compact and cost-effective integration solution
Scale ranges from 0 ... 400 bar or 0 ... 5,000 psi
Voltage signal, e.g. DC 0.5 … 4.5 V
Nominal size 40 mm [1 ½"], 50 mm [2"] or 63 mm [2 ½"]
Accuracy class 2.5
Measurement principle Model PMT01 is a Bourdon tube pressure gauge with integrated sensors. The instrument offers the usual analogue display, which enables reading the process pressure on-site and in addition provides an output signal (e.g. DC 0.5 … 4.5 V).
The measuring system with Bourdon tube produces a pointer rotation proportional to the pressure. An electronic angle encoder, proven in safety-critical automotive applications, determines the position of the pointer shaft – it is a non-contact sensor and therefore completely free from wear and friction. That provides a pressure-proportional signal for further processing.
Integration concept The PMT01 is the ideal pressure measuring system for trouble-free integration into a wide variety of applications.
This is possible through the simple mounting and sealing of the already pre-adjusted system. Due to the sealing with an O-ring and a support ring, the pressure measuring system is efficiently and cost-effectively exchangeable.
Design freedom for customer solutions Without any enclosing components, the model PMT01 OEM pressure measuring system provides a simple and compact integration solution. Both the flat design and the free positionability of model PMT01 open up a multitude of integration variants with the designing of a pressure measuring system with output signal.
Individual customer versions Based on many years of experience in manufacturing and development, WIKA is happy to offer support in the construction and production of customer-specific solutions.
Differential pressure monitoring for filters
Pressure monitoring for ventilators
Overpressure monitoring for clean rooms and also under- and overpressure monitoring for laboratories and operating rooms
Electrical output signal DC 0 … 10 V (3-wire) or 4 … 20 mA (2-wire)
Simple and fast mounting via threaded bezel
Separated construction of measuring chamber and display area
Integrated sealing element for direct mounting in a ventilation duct or instrument panel
Available as a built-in or add-on version
The model A2G-15 differential pressure gauge with electrical output signal is used for monitoring the differential pressure in ventilation and air-conditioning applications. The measuring ranges cover from 0 … 100 Pa to 0 … 6,000 Pa. Plus/minus ranges can be fulfilled from -50 … +50 Pa to -1,500 … +1,500 Pa.
Electrical output signals for both measurands (DC 0 … 10 V or 4 … 20 mA) enable the direct connection to control systems or the building automation system.
The separated construction of the measuring chamber and display area ensures that impurities from the process air do not settle on the back of the window.
The differential pressure gauge is available in IP54 and IP65 ingress protection as well as two different mounting versions.
Built-in version The built-in version with threaded bezel is notable for its fast and tool-free mounting. The built-in case features two back mount connections with a G ⅛ female thread, into which matching threaded pressure connections are screwed.
Add-on version With the add-on version, the add-on case is attached with three screws and then the pressure measuring system is fitted into the case. The add-on case features two lower-mount connections with a G ⅛ female thread, into which matching threaded pressure connections are screwed. The position of each connection can be altered through 90° by rotating the add-on
For gaseous, aggressive media, also in aggressive environments
Measurements of very low pressures from 2.5 mbar
Output signals 4 ... 20 mA, 0 ... 20 mA, DC 0 ... 10 V for the transmission of process values to the control room
No configuration necessary due to "plug-and-play"
High overload safety up to 50 x full scale value
Easy-to-read analogue display with nominal sizes 100 and 160
Low measuring error and influence on function from medium pollution
Measuring chamber protected against unauthorised intervention
Wherever very low pressures have to be indicated locally and, at the same time, a signal transmission to the central control or remote centre is desired, the model PGT63HP intelliGAUGE®(patent, property right: e.g. DE 202007019025) can be used. The robust capsule measuring system has an overload safety of up to 50 times the full scale value. An electronic angle encoder, proven in safety-critical automotive applications, determines the position of the pointer shaft – it is a non-contact sensor and therefore completely free from wear and friction. From this, the electrical output signal proportional to the pressure, e.g. 4 ... 20 mA, is produced.
The measuring span (electrical output signal) is adjusted automatically along with the mechanical display, i.e. the scale over the full display range corresponds to 4 ... 20 mA. The electrical zero point can also be set manually. The electronic WIKA sensor, integrated into the high-quality capsule pressure gauge, combines the advantages of electrical signal transmission with a local mechanical display that remains readable during a power failure. An additional measuring point for mechanical pressure display can thus be saved.
Level measurements in closed tanks, particularly in cryotechnology
Monitoring and control of pumps
For gaseous and liquid media that are not highly viscous
Differential pressure measuring ranges from 0 … 80 mbar to 0 ... 1725 mbar
High working pressure (static pressure) of 50 bar
Overpressure safety either side up to 50 bar
Very compact design
Optionally compact valve manifold with working pressure indication
These high-quality gauges are characterised by their compact and robust design and are primarily used for level measurement on liquid gas tanks. With 11 different measuring cells all usual tank sizes in cryotechnology are covered. As a result of the large measuring range overlap of the respective measuring cells, the gauge installed on the tank can be adjusted to match a whole variety of gases such as Ar, O2, N2or CO2, with a full-scale deflection over a complete 270 degree sweep. The span adjustment is accessible from outside and does not affect the zero point. The mechanical display and the optional electrical output signal are calibrated simultaneously and easily.
An optional valve manifold for flange mounting with working pressure indication makes the central measurement of both level and working pressure possible in the one instrument. The level display can be supplied with an optional, integrated 4 … 20 mA, 2-wire transmitter. Switch contacts for level and working pressure, as well as a transmitter for the working pressure can be retrofitted on site. The standard centre distance of 37 mm between the process connections can be adapted to a custom centre distance of 31 mm or 54 mm using adapters for flange mounting.