SERVICES
Technical Support from the Engineers Who Build Your Sensors
Selection, installation, calibration and troubleshooting — answered within 24 hours by the PRESS SPEC factory engineers. No call centers, no deflection to a distributor, no waiting for a manual.
SUPPORT AREAS
Four Ways We Support Your Project
Model Selection
Range, output, accuracy, connection and materials matched to your process. Answer the five selection questions below and the correct model — or a custom configuration — becomes obvious.
Installation Guidance
Mounting position, thread sealing, torque values, cable routing and electrical wiring recommendations that prevent the most common field failures before they happen.
Calibration & Verification
Zero and span adjustment, calibration intervals, and how to verify a transducer in the field against a reference gauge or deadweight tester.
Troubleshooting & RMA
Systematic diagnosis of no-output, drift, noise and overrange failures. If a unit is genuinely faulty, the RMA process replaces or repairs it quickly.
MODEL SELECTION
The Five Selection Questions
Every pressure sensor specification starts with the same five questions. Answer them and you are 90% of the way to the right model. Send the answers to our export team and we confirm the configuration — and the price — within 24 hours.
What exactly do you measure?
Gauge pressure to atmosphere, absolute pressure, sealed gauge, or differential pressure between two points? Differential applications need a dedicated differential pressure transducer, not two gauges subtracted.
What is the operating pressure range?
Share the normal operating pressure and the maximum possible pressure. We select a range 1.2 to 1.5 times the maximum operating pressure so the sensor stays in its accurate band and survives surges.
Which output and power supply?
4-20mA two-wire is the industrial default — long cable runs, noise immunity and PLC compatibility. 0-10V for short runs, RS485 for digital networks, HART on the PT200 series for configuration and diagnostics.
What media and environment?
The wetted material must tolerate the media — 304 or 316L stainless steel, FKM seals, or a PT400 flush diaphragm for viscous or clogging fluids. Ambient temperature, humidity and IP rating follow the environment.
How is it mounted?
Thread size (G1/4, G1/2, 1/4 NPT, M20x1.5), male or female port, flush diaphragm for hygienic processes, and cable length or connector type. Getting this right avoids adapters and leaks on site.
INSTALLATION
Install It Right the First Time
- ✓Mounting position: keep the diaphragm vertical in liquid service to avoid trapped air pockets, and horizontal in gas service so condensate drains away.
- ✓Thread sealing: use PTFE tape or a sealing washer on the thread — never sealing paste on the diaphragm side, and never over-torque (typical G1/4 torque is 20-30 N·m).
- ✓Cable routing: shielded twisted pair, shield grounded at one end, signal cable separated from power and VFD cables by at least 30 cm.
- ✓Protection: match the IP rating to the environment — IP67 for washdown and outdoor masts, IP65 for dry panels.
CALIBRATION
Calibration & Verification
- ✓Every unit ships calibrated: 100% pressure calibration with a test certificate included in the shipment.
- ✓Field verification: compare the 4-20mA output against a calibrated reference gauge at zero, 50% and 100% of range — drift beyond 0.5%FS signals a re-calibration.
- ✓Zero and span: the PT200 series with HART supports digital zero and span configuration; analog units adjust via the trim potentiometers inside the housing.
- ✓Intervals: 12 months general, 6 months critical or hygienic. Temperature effects are specified on every datasheet for your uncertainty budget.
TROUBLESHOOTING
Common Field Failures — and the Fix
| Symptom | Likely Cause | Recommended Fix |
|---|---|---|
| No output signal | Wrong wiring, reversed polarity, or no power at the sensor | Check supply voltage at the sensor terminals, verify 2-wire loop wiring, and confirm the load resistor is in the loop |
| Reading is unstable or noisy | EMC interference, poor grounding, or cable too close to power lines | Use shielded twisted-pair cable, ground the shield at one end, and route signal cable away from motors and VFDs |
| Output drifts over time | Thermal drift, zero shift after overrange, or diaphragm contamination | Re-zero the transmitter, verify the process never exceeded the range, and inspect the diaphragm for deposits |
| Output stuck at 22mA+ | Overrange pressure, shorted loop, or sensor fault | Check process pressure against the rated range, verify loop resistance, and test the sensor on a bench with a reference gauge |
| No pressure change seen | Blocked pressure port, clogged diaphragm, or closed isolation valve | Open isolation valves, purge the impulse line, and check the port for debris or ice |
Stuck on a failure we have not listed? Describe the symptom, the process conditions and the wiring to the export team, or check the press spec blog for technical guides such as what a pressure transducer is and how 4-20mA transducers work.
FAQ
Technical Support Questions
How fast do you answer technical questions?
Technical questions and quotations are answered within 24 hours on working days. Urgent field issues can reach the export team directly via WhatsApp +86 137 1086 0663.
Which accuracy do I need — 0.5%FS or 0.1%FS?
0.5%FS (PT100) covers most monitoring and control loops. Choose 0.25%FS for tighter control, and the PT200 at 0.1%FS with HART when you need the best repeatability, custody-level measurement or digital diagnostics.
How often should sensors be calibrated?
Typical intervals are 12 months for general industrial service and 6 months for critical loops or hygienic applications. Field verification with a reference gauge can extend intervals if drift stays within tolerance.
Can you help if our existing sensor keeps failing?
Yes — send the failure mode, datasheet and photos. We diagnose the root cause (overrange, media compatibility, vibration, wiring) and recommend the correct model or a custom configuration that survives your process.
Do you provide installation documentation?
Yes, every shipment includes the user manual with wiring diagrams, mounting instructions and torque values. Datasheets and technical documentation are also available before you order, for your own design reviews.
Need a Selection or Troubleshooting Answer?
Send your process details — pressure, media, output and environment. A PRESS SPEC engineer replies within 24 hours with a model recommendation or a fix.