Quick Answer
Prism Calibration Centre (NABL CC-2480) is the top HART device calibration lab in Gujarat, calibrating HART-enabled temperature transmitters, pressure transmitters, flow meters, and loop instruments using HART communicators and precision loop calibrators.
Key Takeaways
- HART device calibration requires specialist tools: HART communicator (275/375/475) and precision loop calibrators.
- Prism (NABL CC-2480) is the only Ahmedabad lab with full HART calibration capability on-site.
- Covers Yokogawa, Endress+Hauser, Rosemount, ABB, Honeywell, and all major HART brands.
- HART calibration includes analog (4–20 mA) loop check, digital HART channel verification, and uncertainty calculation.
- On-site HART calibration available across Gujarat with mobile HART communicator kits.
What Are HART Devices and Why Do They Need Special Calibration?
HART (Highway Addressable Remote Transducer) is a dual-signal protocol — it superimposes a digital signal on the standard 4–20 mA analog current loop. HART devices include smart transmitters for temperature (RTD/thermocouple), pressure, flow, level, and analytical measurements. Calibrating a HART device means verifying BOTH the analog 4–20 mA output AND the digital HART variable simultaneously.
Why Standard Labs Fail HART Calibration
Most calibration labs can calibrate the analog 4–20 mA output but cannot verify the digital HART channel, PV (primary variable), SV (secondary variable), or HART diagnostic data. Prism's HART-capable lab covers the complete calibration.
HART Brands We Calibrate
- Rosemount (Emerson) — 3051, 3144P, 644
- Yokogawa — EJA, EJX series
- Endress+Hauser — PMC, TMT, FMT series
- ABB — 266, 600T, TemposonicsABB
- Honeywell — STD800, STT820, STG
- Siemens — SITRANS P, T, F
- Krohne — OPTIFLUX, OPTISONIC
- Vega — VEGAPULS, VEGABAR
HART Calibration Procedure at Prism
HART Device Connection
Connect HART communicator (Emerson 475 or equivalent) to the device loop. Read PV, SV, AV, QV digital variables.
Analog Loop Check
Inject reference signal (precision RTD / pressure source). Measure 4–20 mA output with calibrated loop calibrator.
Trim Calibration
Perform sensor trim (Lower Sensor Trim, Upper Sensor Trim) and output trim using HART commands.
As-Found / As-Left Data
Record as-found error and as-left error at 0%, 25%, 50%, 75%, 100% range points.
NABL Certificate
Issue NABL-accredited certificate with measurement uncertainty, traceability statement, and HART device tag number.
Industries Using HART Devices in Gujarat
- Refineries & Petrochemical (ONGC, GSFC, Reliance)
- API & Bulk Drug Manufacturing (Ahmedabad pharma belt)
- Chemical & Fertilizer Plants (Bharuch, Ankleshwar)
- Power Plants (GSECL, Torrent Power)
- Water Treatment (AMC, GWSSB)
- Food & Beverage (FSSAI compliance)
Frequently Asked Questions
Can a regular calibration lab calibrate HART devices?
No. HART calibration requires a HART communicator (e.g., Emerson 475 Field Communicator) and a precision loop calibrator. Most labs only check the 4–20 mA output. Prism performs full HART calibration including digital variable verification.
Which HART communicator does Prism use?
Prism uses the Emerson 475 HART Field Communicator and Fluke 754 loop calibrator for all HART device calibrations.
Is HART calibration NABL-accredited at Prism?
Yes. Prism's NABL CC-2480 scope includes calibration of HART-enabled temperature and pressure transmitters.
How long does HART transmitter calibration take?
A single HART transmitter calibration typically takes 2–4 hours including connection, trim, measurement, and certificate generation. Batch orders are processed within 24–48 hours.
Does Prism provide on-site HART calibration at refineries?
Yes. Prism's mobile team can perform on-site HART calibration at your refinery or process plant across Gujarat.
Written by
Er. Parthiv Kinariwala
Managing Director · Prism Calibration Centre · NABL CC-2480 · Ahmedabad
Er. Parthiv Kinariwala founded Prism Calibration Centre in 2004 and has over 20 years of hands-on experience in calibration engineering, NABL accreditation, and industrial compliance. His team performs 10,000+ calibrations annually from the Vatva GIDC laboratory, serving 5000+ industries across Gujarat.
Prism Calibration Centre — Vatva GIDC, Ahmedabad
Prism Calibration Centre
F-101, Rudraksh Complex 2, Phase 3, GIDC Vatva, Near Jasoda Nagar Cross Road, Ahmedabad — 382445, Gujarat, India
Phone: +91 98245 26444
Email: info@prismcalibration.com
NABL: CC-2480 · ISO/IEC 17025:2017
Hours: Mon–Sat, 9:00 AM – 7:00 PM