Instrument Calibration and Repair On Site or in the Laboratory
Calibration and repair of temperature, pressure, electrical, gas, dimensional and mass instruments, on site or in the lab, with traceable certificates.
itmad calibrates and repairs measuring and process-control instruments for industrial, energy, healthcare and aviation clients. Calibration is carried out either on site at the client's facility or in the laboratory, depending on the instrument and the downtime that the client can accept. itmad operates across the Middle East, Asia and Europe.
Temperature instruments
Instruments are compared against calibrated reference thermometers and dry-block or bath sources at several points across the working range, so that the error is known where the instrument is actually used and not at a single point. The range includes digital, glass and infrared thermometers, thermo-hygrometers, whirling hygrometers, thermocouples and RTDs, temperature calibrators, temperature gauging systems, ullage temperature interface detectors, petroleum gauging thermometers and electrode drying ovens. Chambers, cold rooms, freezer and chiller rooms and refrigerated transport units are surveyed with multiple sensors to show temperature distribution and not just a spot reading.
Electrical test equipment
Multimeters, ammeters, voltmeters, clamp meters, frequency meters, earth resistance meters, resistance boxes and process meters are calibrated across each function and range in use against a multifunction calibrator, with as-found readings recorded before any adjustment. Safety-related instruments such as high-voltage testers and pinhole detectors are verified at the setpoints that users rely on.
Pressure instruments
Pressure gauges, transmitters, vacuum gauges, digital manometers and airline gauges are checked against a dead-weight tester or reference pressure calibrator on both rising and falling pressure, which exposes the hysteresis and sticking that a single-direction check misses. Transmitters are verified across the full output span.
Gas detection instruments
A bump test confirms that a sensor and alarm respond; a full calibration adjusts the span response against certified gas of known concentration. itmad records response time and verifies alarm setpoints on portable multi-gas and single-gas detectors and on fixed gas detection systems, calibrating with carbon monoxide, sulphur dioxide, hydrogen sulphide, oxygen, and toxic and flammable gases.
Precision and dimensional instruments
Vernier calipers, inside, outside and depth micrometers, dial gauges, height gauges, bore gauges, inclinometers, try squares, bevel protractors and measuring tapes are verified against gauge blocks, setting rings and reference standards at several points across the measuring range. This is done under controlled temperature conditions, since dimensional measurement is sensitive to thermal expansion.
Environmental, force and mass instruments
Balances, whether weighing, analytical or industrial, are checked with certified reference weights for repeatability, eccentricity and linearity across the weighing range and not at one load. Torque wrenches are verified against a calibrated torque transducer in the direction of use. The same group covers lux meters, anemometers, pH meters, conductivity meters and tachometers.
What the client receives
A calibration certificate identifies the instrument, its serial number and the reference standards used, and reports as-found and as-left readings so that the client can see whether the instrument had drifted before adjustment. Measurement uncertainty is stated where applicable, and the result is given as pass or fail against the client's stated tolerance, with immediate notification if an instrument is found out of tolerance. Each instrument carries a label showing the calibration and due dates, and the client's instrument register is updated where itmad holds it.
Traceability and accredited certificates
Every certificate states the reference standards used, the measured values and the measurement uncertainty where applicable, and the reference standards are traceable to national and international standards. Where an ISO/IEC 17025 accredited certificate is required, the work is performed through itmad's accredited partner laboratory and the certificate is issued under that laboratory's accreditation. Clients should say at enquiry stage whether they need an accredited certificate, because it affects turnaround and cost.
Recalibration intervals and repairs
The interval depends on the instrument, how it is used and the client's quality system. Annual recalibration is common for general workshop instruments, while gas detectors and safety-critical instruments are usually verified far more often, and itmad can hold the instrument register and give notice before each due date. Instruments found out of tolerance can be repaired or adjusted and recalibrated in the same visit where parts allow, for general and process-control equipment.
Why clients choose itmad
itmad's calibration technicians are qualified and experienced in instrumentation, the reference equipment is internationally recognised, and the work follows documented procedures. A quotation can be prepared from the client's instrument list.
Frequently asked questions
What instruments does itmad calibrate?
Temperature, electrical, pressure, gas detection, precision and dimensional, and environmental, force and mass instruments. They range from thermometers, multimeters and pressure gauges to gas detectors, micrometers, balances and torque wrenches.
Can calibration be done on site?
Yes. Calibration is carried out on site at the client's facility or in the laboratory, depending on the instrument and the downtime that the client can accept.
What does a calibration certificate show?
The instrument and its serial number, the reference standards used, as-found and as-left readings, measurement uncertainty where applicable, and pass or fail against the client's tolerance. A label on the instrument shows the calibration and due dates.
What is the difference between a bump test and a calibration for gas detectors?
A bump test confirms that the sensor and alarm respond, whereas a full calibration adjusts the span response against certified gas of known concentration. itmad also records the response time and verifies the alarm setpoints.
Is an ISO/IEC 17025 accredited certificate available?
Yes, where it is required. The work is performed through itmad's accredited partner laboratory and the certificate is issued under that laboratory's accreditation, so the client should say at enquiry stage whether one is needed.
How often should instruments be recalibrated?
Annual recalibration is common for general workshop instruments, while gas detectors and safety-critical instruments are usually verified far more frequently. itmad can hold the instrument register and notify the client before each due date.