- Range
- 100 kPa to 100 MPa across the range, with 0-0.6, 0-1, 0-1.6, 0-2.5, 0-40, 0-60 and 0-100 MPa as the common spans
- Accuracy
- 0.2, 0.4 or 0.5 class depending on the form
- Display
- Four digits with up to three decimal places, six switchable units and a backlight
- Process connection
- M20 x 1.5 as standard, with NPT 1/4 and G1/2 to order
- Wetted material
- 304 stainless steel
- Supply
- Battery, or 24 V DC on the transmitting form
- Output
- 4-20 mA on the transmitting form
- Ingress protection
- IP65
A dial gauge answers one question at a glance and leaves the reading to the eye. A digital gauge answers the same question with a number, and that difference matters most where the reading is written down: a pressure test that has to be logged, a line checked against a specification, or a value typed into a controller.
This page covers the battery form that is read at the instrument and the 24 V DC form that sends a 4-20 mA signal to a control system. They share the case, the display and the connection; they differ in whether the number leaves the gauge.
Product overview
The instrument is a stainless-bodied pressure gauge with a liquid-crystal display in place of a dial. The material gives spans from 100 kPa to 100 MPa, with 0-0.6, 0-1, 0-1.6, 0-2.5, 0-40, 0-60 and 0-100 MPa as the common ones, and offers gauge, vacuum and compound forms.
The case is 304 stainless steel with IP65 sealing, and the process connection is M20 x 1.5 as standard, with NPT 1/4 and G1/2 also listed. The panel-mount version carries a flange and three fixing holes, which is how it is fixed through a panel rather than screwed into a pipe.
How the gauge works
A pressure sensor behind the connection converts the applied pressure into an electrical signal. The electronics linearise that signal and show it as a number, with the decimal point placed according to the span.
Two consequences follow. The reading is a number rather than a position between graduations, so it can be recorded without interpretation; and the resolution is set by the display rather than by the sensor, which is why the material can offer four digits and three decimal places on every span. Three decimal places on a 100 MPa span is a resolution of 0.001 MPa, far finer than the accuracy class supports, so the decimals should be read together with the span rather than on their own.
The display carries a battery symbol and a backlight, and the keys switch units, set the zero and reset the instrument.
How to select the right gauge
Four choices settle most of the answer.
Pressure type. Gauge, vacuum and compound are different instruments, not options on one. A compound form reads positive and negative pressure on one instrument and is the form for a vacuum line or a pump that can pull a vacuum on its suction side.
Span. The working pressure should sit in the upper part of the span rather than near the bottom, which is the same rule as for a dial gauge: a sensor read at 5 % of its range gives away resolution and accuracy that a smaller span would keep.
Accuracy class. The material offers 0.2, 0.4 and 0.5 class. A finer class costs more and is only worth paying for where the reading is used as a reference; for a plant-room check the coarser class is usually enough.
Supply and output. The battery form is read at the gauge and has no output. The 24 V DC form sends 4-20 mA to a control system. If the value is needed in a PLC or a logger, the battery form cannot supply it, and that single question decides between the two.
Installation and configuration
The connection is a threaded port, so the gauge is screwed into the pipe or into a manifold. The panel-mount form is fixed through a panel with three screws and takes its pressure from a line brought to it.
The practical points are the same as for any pressure instrument: a seal at the thread, a syphon or a cooling element where the medium is hot, and a position where the display can be read without leaning over the line. The material gives no installation torque and no straight-run requirement, and neither is invented here.
The battery is replaceable, and the display shows remaining charge before it fails. The material does not state the cell type or its life, so both are listed as information required.
Measurement limitations and selection considerations
The material names water, air, hydraulic oil and oil as the media, which is the ordinary band for a 304 stainless wetted part. It does not state compatibility with aggressive media, and a diaphragm seal would be a separate question rather than an option on this instrument.
Three figures are unsettled and are listed as information required rather than filled in from a similar gauge: the sensing element, the overload capacity, and the working temperature range. The sensing element matters because it sets what the gauge can survive; the overload capacity matters because a pressure line can spike well above its working value.
The accuracy conflict is the one to watch in a quotation. The material quotes both a class and a percentage of span, and they are not the same quantity. On a 100 MPa span, one percent of span is 1 MPa, so the basis should be confirmed before the figure is used in a specification.
Every value below is taken from source documentation. Where a parameter is not stated in the available material it is marked as information required rather than estimated.
