Differential Pressure Transmitter
Calibrate DP transmitters for flow, level, and differential pressure measurement in industrial processes.
Standards
IEC 60770-1, ISO/IEC 17025
Typical Interval
12 months
Uncertainty Range
±0.1% FS
What Is Differential Pressure Transmitter?
DP transmitters are widely used to measure flow rate (via orifice plates or flow nozzles) and liquid level in vessels. Calibration verifies the 4-20mA output signal at multiple differential pressure points using a reference pressure calibrator.
Applicable Standards
Primary standards: IEC 60770-1, ISO/IEC 17025
ISO/IEC 17025-accredited laboratories must maintain an unbroken traceability chain from the calibration result back to NIMT (Thailand's national metrology institute) or another internationally recognised NMI.
Typical Measurement Uncertainty
Expanded uncertainty is typically ±0.1% FS, depending on the measurement range, reference equipment used, and environmental conditions. The actual uncertainty will be stated on your calibration certificate.
Recommended Calibration Interval
A calibration interval of 12 months is generally recommended. The appropriate interval for your specific instrument depends on usage frequency, environmental exposure, and any applicable regulatory or customer requirements.
What Your Calibration Certificate Will Include
- Calibration results — instrument indication vs. reference value at each test point
- Error and expanded uncertainty (U) at k=2 (95% confidence level)
- Traceability chain to NIMT or a recognised NMI
- Environmental conditions during calibration (temperature, humidity)
- Calibration date, certificate number, and authorised signature
Find a Differential Pressure Transmitter Calibration Lab in Thailand
ThaiLabHub lists ISO 17025-accredited calibration laboratories across Thailand. Search our directory to find labs that offer differential pressure transmitter services, with scope details, location, and contact information.
For Labs: Manage Differential Pressure Transmitter Jobs with LabSync
LabSync helps Thai calibration laboratories manage jobs, issue traceable certificates, calculate GUM uncertainty budgets, and generate Thai tax reports (PP30 + WHT) — all in one system.
Frequently Asked Questions
Why is it important to calibrate a Differential Pressure Transmitter?+
Pressure measurement errors directly impact process safety and product quality. A Differential Pressure Transmitter outside tolerance can trigger false alarms or — more dangerously — miss a real pressure event. Calibration verifies accuracy to ±0.1% FS per IEC 60770-1, ISO/IEC 17025.
How often should a Differential Pressure Transmitter be calibrated?+
Most Differential Pressure Transmitters should be calibrated every 12 months under normal operating conditions. High-use environments, harsh conditions (vibration, temperature extremes), or regulatory requirements (FDA, GMP, ISO 17025) may necessitate more frequent calibration. Always follow the manufacturer's recommended interval as a baseline and consult your lab's quality plan.
What does a Differential Pressure Transmitter calibration certificate show?+
A calibration certificate issued under ISO/IEC 17025 includes: the instrument identification (make, model, serial number), the reference standards used (with their own traceability chain), the measurement points tested, before/after correction values, the expanded measurement uncertainty (±0.1% FS), the environmental conditions during calibration, the calibration date and next-due date, and the signature of the authorized calibration engineer. This certificate is the evidence required for audits and accreditation.
Labs offering pressure calibration
Chiang Mai Metrology Center
Chiang Mai
ISO/IEC 17025:2017Phuket Marine Calibration Center
Phuket
ISO/IEC 17025:2017Rayong Petrochemical Calibration Center
Rayong
ISO/IEC 17025:2017Eastern Seaboard Calibration Center Chonburi
Chonburi
ISO/IEC 17025:2017National Institute of Metrology Thailand (NIMT)
Pathum Thani
ISO/IEC 17025:2017 (TIS 17025-2561)Khon Kaen Calibration Laboratory
Khon Kaen
ISO/IEC 17025:2017Related Calibration Services
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