- Knife edge pointer for optimal accuracy of reading
- Precise movement with wear parts of argentan
- Scale ranges from 0 … 0.6 to 0 … 600 bar [0 ... 10 psi to 0 ... 10,000 psi]
 Datasheet |
| User Manual |
| User Manual |
![WIKA Models 332.50, 333.50 Test gauge, stainless steel Standard version, class 0.6, NS 160 [6"]](https://www.ics-schneider.de/wp-content/uploads/2017/10/Typen-332.50-333.50-350x350.jpg?x90648)
- Completely from stainless steel
- Knife edge pointer for optimal accuracy of reading
- Wear-resistant precision movement from stainless steel
- Scale ranges from 0 … 0.6 to 0 … 1,600 bar [0 ... 10 psi to 0 ... 20,000 psi]
|
Datasheet |
| User Manual |
| User Manual |
![WIKA Models 332.30, 333.30 Test gauge, stainless steel Safety version, class 0.6, NS 160 [6"]](https://www.ics-schneider.de/wp-content/uploads/2017/09/Typen-332.30-333.30-350x350.jpg?x90648)
- Safety pressure gauge with solid baffle wall designed in compliance with the requirements and test conditions of EN 837-1
- Completely from stainless steel
- Knife edge pointer for optimal accuracy of reading
- Wear-resistant precision movement from stainless steel
- Scale ranges from 0 … 0.6 to 0 … 1,600 bar [0 ... 10 psi to 0 ... 20,000 psi]
| Datasheet |
| User Manual |
| User Manual |
- Knife edge pointer and dial with mirror band scale for optimal accuracy of reading
- Precise movement with wear parts of argentan
- Particularly easy-to-read scale due to nominal size 250
- Scale ranges up to 0 … 1,600 bar
| Datasheet |
| User Manual |
- Zero adjustment in front
- Special connection location on request
- Low scale ranges from 0 ... 10 mbar
| Datasheet |
| User Manual |
Precision Test Gauges – accuracy for testing, calibration & quality assurance
Precision test gauges (high-accuracy Bourdon tube gauges, sometimes capsule or differential precision types) are designed for accurate test and reference measurements in labs, workshops and production. They offer fine dial graduations, low hysteresis and high repeatability — ideal for test benches, commissioning, on-site calibration, or as a reference indication alongside digital pressure calibrators.
ICS Schneider Messtechnik supports you with range & accuracy selection, scales (bar/psi/kPa), dial size for optimum readability, materials (e.g., 316L), and process connections (G 1/4, G 1/2, NPT, flange). On request we provide calibration certificates (ISO/DAkkS), damping accessories (snubber/restrictor) and — if needed — parallel digitalization via transmitters (4–20 mA/HART/RS-485) and edge/MQTT.
FAQ on Precision Test Gauges
Common questions on accuracy classes, selection, installation, damping, calibration, and temperature/media effects.
What are precision test gauges used for?
For precise reference indication on test benches, on-site calibration of process gauges/switches, quality assurance in production and service, and as a comparison standard next to pressure calibrators.
Which accuracy classes are typical?
| Class (EN 837) | Typical use | Note |
|---|---|---|
| 0.6 | Accurate process/QA measurements | Large dial recommended |
| 0.4 | Workshop/laboratory testing | Fine graduation, stable environment |
| 0.25 | Reference near calibrator | Very low hysteresis, steady signal |
How do I choose the right measuring range?
As a rule of thumb use working pressure × 1.3–1.6. For test tasks, select the span so that the critical measuring point lies in the middle third of the dial. For vacuum/absolute pressure consider dedicated scales.
Which measuring systems are used?
| Measuring system | Range | Advantages | Consider |
|---|---|---|---|
| Bourdon tube | Under/overpressure up to high pressure | Robust, good linearity | Damp pulsation |
| Capsule | Very low pressure (mbar) | Very sensitive | Temperature/vibration effects |
| Precision Δp mechanism | Small differentials | Filters/flow/proof tests | Check static rating |
Which dial sizes improve readability?
| Dial size | Benefit | Recommendation |
|---|---|---|
| DN 100 | Good readability | General QA |
| DN 160 | Very fine graduation | Reference/test bench |
| DN 200 | Max. resolution/distance | Lab/panel mounting |
What scales and units are available?
Scales in bar, mbar, kPa, MPa, psi or as a dual scale. For test benches, fine-graduation dials with mirror band (parallax-free) are recommended.
How do I protect the measuring system from pulsation & pressure spikes?
Use a restrictor/snubber, capillaries or remote mounting. With steam/high temperature use a siphon/cooling section. A span that is too small increases stress.
Is liquid filling (glycerin) advisable?
Only for vibration and shock. For the best readability without vibration a dry version is usually preferable (less temperature influence on indication).
Which process connections are available?
| Connection | Standard | Remark |
|---|---|---|
| G 1/4 / G 1/2 | ISO 228 | Industry standard |
| ¼" / ½" NPT | ASME | US installations |
| Flange | EN/ASME | Special/hygienic with diaphragm seal |
What materials are common?
Stainless steel 316L for case/measuring system in demanding media/environments; brass for neutral media. Select seals to match the medium (NBR/FKM/EPDM/PTFE/FFKM).
How does temperature affect indication?
Temperature changes cause zero/span drift, especially on fine ranges. Keep ambient stable, allow thermal equilibration before measurement, and perform zero checks.
How often should I calibrate?
Rule of thumb: annually; in QA/safety loops semi-annually/quarterly or after events (shock/overload). Store certificates (ISO/DAkkS) securely.
Precision test gauge vs. deadweight tester?
| Criterion | Precision test gauge | Deadweight tester |
|---|---|---|
| Mobility | High, plug-and-play | Stationary/more effort |
| Accuracy | to 0.25 % of span | to 0.01…0.05 % of span |
| Use | Quick checks/reference indication | Primary standard/cal lab |
What IP protection classes are available?
Typically IP54–IP65; consider front sealing and safety glass. For washdown/hygiene use diaphragm seals and smooth surfaces as required.
What matters during installation?
- Low-vibration mounting; keep the dial clearly visible.
- Do not apply lever forces via the process connection.
- Provide vent/drain (steam/condensate) before measurement.
Can I add IIoT connectivity?
Yes, via a dual measuring point: precision gauge for local indication + transmitter (4–20 mA/HART/RS-485). An edge gateway publishes securely via MQTT/HTTPS to SCADA/cloud.
Typical fault causes & remedies?
- Pointer flutter: pulsation/vibration → snubber/restrictor, check mounting.
- Zero shift: temperature/overload → zero adjustment/calibration.
- Sluggish indication: damping too strong → adapt settings/accessories.
Do you offer selection & calibration services?
Yes. We size range/dial, choose scales/materials/connection, provide calibration certificates and, on request, accessories (restrictors, siphons, brackets) as well as digital integration.