- High working pressure (static pressure) and high overload safety, selectable up to 40, 100, 250 or 400 bar
- Measuring cell liquid dampening against rapid pressure changes
- No configuration necessary due to "plug-and-play"
- Differential pressure measuring ranges from 0 … 60 mbar
- Individual, non-linear characteristic curves (e.g. x2 or √x for flow measurement)
 Datasheet |
| User Manual |
- Differential pressure measuring ranges from -1 … +30 bar [-14.5 ... 435 psi] to 0 ... 40 bar [0 ... 580 psi]
- High working pressure (static pressure) and high overload safety, selectable 40 bar [580 psi], 100 bar [1,450 psi], 250 bar [3,625 psi], 400 bar [5,800 psi] and 650 bar [9,425 psi]
- The transmission fluid in the measuring chamber dampens the indicator in case of high changes of the rate of pressure
- Model 73x.14: Stainless steel version
- Model 76x.14: Version with special materials
| Datasheet |
| User Manual |
- Differential pressure measuring ranges from 0 ... 16 mbar to 0 ... 40 bar or 0 ...10 inH2O to 0 ... 600 psi
- High operating pressure (static pressure) up to 40 bar [600 psi]
- High overload safety up to 40 bar [600 psi]
- Models 732.31 and 733.31: Case with safety level “S3” per EN 837
- All-welded media chamber
| Datasheet |
| User Manual |
- No configuration necessary due to “plug-and-play”
- Signal transmission per NAMUR
- Differential pressure measuring ranges from 0 … 16 mbar
- Easy-to-read analogue display with nominal sizes 100 and 160
- Individual, non-linear characteristic curves (e. g. x2 or √x for flow measurement)
| Datasheet |
| User Manual |
- Differential pressure measuring ranges from 0 … 16 mbar
- High working pressure (static pressure) and high overload safety up to 40 bar
- Also available with liquid-filled case for high dynamic pressure loads or vibrations
- Instruments with inductive contacts for use in hazardous areas
- Instruments with switch contact for PLC applications
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Datasheet |
| User Manual |
- Differential pressure measuring ranges from 0 … 60 mbar
- High working pressure (static pressure) and high overload safety, selectable up to 40, 100, 250 or 400 bar
- Measuring cell liquid dampening against rapid pressure changes
- Instruments with inductive contacts for use in hazardous areas
- Instruments with switch contact for PLC applications
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Datasheet |
| User Manual |
- Transmission of process values to the control room (e.g. 4 ... 20 mA)
- Shatterproof window and robust aluminium or stainless steel measuring chamber for increased requirements
- Optionally with approvals for hazardous areas
- High ingress protection, IP65, for outdoor use and processes with high condensation
- Low measuring range from 0 ... 160 mbar
| Datasheet |
| User Manual |
- With one or two adjustable microswitches
- Shatterproof window and robust aluminium or stainless steel measuring chamber for increased requirements
- Optionally with approvals for hazardous areas
- High ingress protection, IP65, for outdoor use and processes with high condensation
- Low measuring range from 0 ... 250 mbar
| Datasheet |
| User Manual |
- Shatterproof window and robust aluminium or stainless steel measuring chamber for increased requirements
- Low scale ranges from 0 ... 160 mbar
- High accuracy down to 1.6 %
- Optionally with approvals for hazardous areas
- Helium leak tested
| Datasheet |
| User Manual |
- Fast, tool-free mounting via threaded bezel
- Separated construction of pressure measurement chamber and display area
- Integrated sealing element for direct installation in a ventilation duct or instrument panel
- Available as a built-in or add-on version
- Individual design of dial and scale possible
| Datasheet |
| User Manual |
- Very small insertion depth
- 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
- Individual design of dial and scale possible
| Datasheet |
| User Manual |
- Differetial pressure with moving dial
- Design optionally with duplex scale
- With liquid-filled case for damping in applications with high dynamic pressure pulsations or vibrations and for avoiding condensation water Model 733.18
- Combined pressure and temperature scales as duplex, triples or quadruplex scales for all common refrigerants
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Datasheet |
- Differential pressure measuring ranges from 0 … 2.5 mbar
- As a standard zero adjustment in front
- Ingress protection IP66
- Case from stainless steel
| Datasheet |
| User Manual |
- Differential pressure measuring ranges from 0 … 40 mbar to 0 ... 4,000 mbar
- High working pressure (static pressure) of 50 bar
- Overpressure safety either side up to 50 bar
- Scalable measuring ranges (maximum turndown of 1 : 3.5)
- Compact valve manifold with working pressure indication (optional)
| Datasheet |
| User Manual |
- Differential pressure measuring ranges from 0 … 40 mbar to 0 ... 4,000 mbar
- High working pressure (static pressure) of 50 bar
- Overpressure safety either side up to 50 bar
- Scalable measuring ranges (maximum turndown of 1 : 3.5)
- Compact valve manifold with working pressure indication (optional)
| Datasheet |
| User Manual |
- Scale ranges from 0 ... 0.6 bar to 0 … 1,000 bar
- Two process connections and two independent pointers
- Differential pressure display with moving dial
- Cost-effective and reliable
| Datasheet |
| User Manual |
- Differential pressure measuring ranges Model 700.01: from 0 ... 400 mbar to 0 ... 10 bar Model 700.02: from 0 ... 160 mbar to 0 ... 2.5 bar
- Compact system case from stainless steel, suitable for high working pressures (static pressures) selectable, 100, 250 or 400 bar (model 700.02 up to a max. 100 bar)
- Overpressure safe either side to maximum working pressure
- System and/or case of indication may be changed locally
- Up to 2 reed contacts may also be adjusted and retrofitted locally
| Datasheet |
| User Manual |
Differential Pressure Gauges – monitor filters, flow & room pressure with confidence
Differential pressure gauges measure the pressure difference between two points (Phigh – Plow) and are ideal for filter monitoring, flow/velocity measurement (orifice/nozzle), room/cleanroom pressure, level via Δp in closed tanks, as well as HVAC, dust collectors, de-dusting systems and process air.
Depending on the application, versions are available with diaphragm or piston sensing systems, optional glycerin filling, overload protection, limit switches, or in hygienic design. ICS Schneider Messtechnik supports selection, range sizing, static pressure rating, materials and connections — on request with a calibration certificate and parallel IIoT integration (transmitter 4–20 mA/HART/RS-485).
FAQ on Differential Pressure Gauges
Answers on selection, measuring principles, static pressure rating, installation, accuracy, protection, hygiene & calibration.
What measuring principles exist for differential gauges?
| Principle | Typical range | Advantages | Consider |
|---|---|---|---|
| Diaphragm | mbar to a few bar Δp | High sensitivity, clear indication | Check static pressure rating |
| Piston | higher Δp | Robust, tolerant to contamination | Friction/inertia |
| Capsule | very low Δp (mbar) | Very sensitive | Vibration/thermal drift |
What are typical applications?
- Filter monitoring (bag/cartridge, HEPA): fouling level via Δp.
- Flow/volume using differential pressure across orifice/nozzle/Pitot tube.
- Room/cleanroom pressure (negative/positive zones).
- Level in closed tanks (Δp proportional to head height).
What is a static pressure rating?
It specifies the absolute line pressure both sides of the sensing system can withstand — independent of the small Δp to be measured. Example: Δp 0…250 mbar with PN 16 static. This rating must match your pipeline pressure.
How do I choose the correct Δp range?
For filters: set full scale ≈ allowed end-of-life Δp × 1.3–2.0. For flow: calculate Δp for the primary element (orifice/nozzle) and keep a safety margin.
What accuracy classes are common?
| Class | Use | Note |
|---|---|---|
| 2.5 – 1.6 | General indication | Cost-effective, readable |
| 1.0 – 0.6 | Process/quality | Finer scale/larger dial |
Which process connections are common?
| Connection | Standard | Remark |
|---|---|---|
| G 1/4, G 1/2 | ISO 228 | separate ports for High/Low |
| ¼" NPT, ½" NPT | ASME | US installations |
| Flange / Hygienic | EN/ASME / EHEDG | with diaphragm seal/separator |
How do I protect the measuring system from overload and shocks?
- Choose integrated overload protection (stops/valves).
- Install a restrictor/snubber against pulsation.
- With steam/high temperature: use a siphon/cooling section.
Are switch contacts available?
Yes. Versions with limit switches (mechanical/reed/magnetic) for pump/filter control are available. Alternatively, Digitalmanometers/transmitters with relays or analog output.
How do I integrate Δp gauges into control systems?
Use a dual measuring point: local gauge + Δp transmitter (4–20 mA/HART/RS-485). An edge gateway publishes data securely via MQTT/HTTPS to SCADA/cloud.
What should I consider during installation?
- Clearly label and connect the H/L ports correctly.
- Provide isolation/bleed valves (service/zeroing).
- Mount with low vibration; keep capillaries short.
Which media are suitable?
Depending on materials from air/gases (filters/HVAC) to liquids (process water). For viscous/aggressive media use diaphragm seals or piston systems.
Can I meet hygiene and CIP/SIP requirements?
Yes, with hygienic connections (Tri-Clamp/Varivent®), polished surfaces and suitable diaphragm seals/fill fluids (FDA/EU compliant).
How is Δp used for flow measurement?
Δp ∝ v²: with a standardized primary element (e.g., orifice), volumetric flow can be calculated. For reporting, use a transmitter + calculation in edge/SCADA.
Which dial sizes improve readability?
| Dial size | Use | Benefit |
|---|---|---|
| DN 63 | Compact systems | Saves space |
| DN 100 | All-round | Good readability |
| DN 160 | Distance/vibration | Very good readability |
How often should I calibrate?
Rule of thumb: annually; in QA/safety loops semi-annually/quarterly or after events (shock/overload). Store certificates (DAkkS/ISO) securely.
Which sealing and body materials are typical?
Stainless steel 316L for many media/environments; brass for neutral gases/liquids. Choose seals NBR/FKM/EPDM/PTFE/FFKM to suit the medium.
What IP protection classes are available?
Typically IP54–IP65; for washdown, check front sealing/window. Safety versions with blow-out back and safety glass are available.
Typical fault causes & remedies?
- Pointer flutter: pulsation/vibration → add snubber, check mounting.
- No true zero: trapped pressure/air → vent using valves.
- Sluggish indication: damping too strong → adjust settings/hardware.
- Overload damage: static rating exceeded → review sizing/protection.
Do you support selection & documentation?
Yes. We size the Δp range and static rating, select materials/connections, provide calibration certificates and, if desired, transmitters/edge for digitalization.