Digital Pressure Gauge Calibration

A basic summary of our NATA accredited scope:

Pressure:

We can calibrate virtually all pressure reading devices

• Up to 415MPa / 60,000PSI
• 0.009% Uncertainty capable for precision devices up to 105MPa (15,000PSI)
• Excellent low pressure capability – 0.65Pa uncertainty on draught pressures
• Barometers and absolute pressure transmitters with current, voltage or frequency outputs

Electrical:

DMMs, Meters, Calibrators

• DC Voltage up to 1050V, from 5ppm uncertainty
• DC Current up to 30A, from 20ppm uncertainty
• AC Voltage and Current 10Hz to 100 kHz, from 0.02%
• Resistance up to 10 GΩ, Capacitance up to 200 mF

HV Insulation and Continuity

• Insulation Resistance up to 10GΩ, 10kV test voltage
• MicroOhm Continuity from as low as 1μΩ at 100A test current

Frequency and Time

• Frequency calibration up to 100 MHz on counters, meters, calibrators or testers.  From 5 μHz uncertainty
• RCD Testers, trip time uncertainty from 0.3ms

Resistor Sets and Decade Boxes

• Standard Resistors, Calibration Boxes,
  Insulation Test Boxes, Decade Boxes etc…
  From 10 μΩ to 10 GΩ

Calibration is the process of checking and configuring a pressure gauge to ensure accurate measurements can occur. This section will delve into the intricacies of digital pressure gauge calibration, explaining how it works and why it’s crucial.

Digital pressure gauge calibration is a process used to ensure that digital pressure gauges, instruments that measure and display the pressure in a system using electronic means, are providing accurate and reliable readings.

This calibration involves comparing the readings from the digital pressure gauge with those from a standard or reference gauge that has known accuracy. The process usually takes place in a controlled environment to minimise the effects of external factors such as temperature and humidity.

Calibration, a fundamental process in various industries, involves the verification and adjustment of measurement instruments to ensure their required accuracy and reliability. This process is essential for maintaining the quality and consistency of products, processes, and safety in various fields. Here are some key points highlighting the importance and benefits of calibration:

Accuracy and Precision in Measurements

Calibration ensures that instruments, such as scales, pressure gauges, and thermometers, provide accurate and precise measurements. This is crucial in industries where exact measurements are critical.

Quality Assurance

Calibration improves and ensures that the measurements used in production processes are correct, leading to the consistent quality of products.

Cost Savings

Regular calibration can identify issues with instruments before they become significant problems. This proactive approach can save money by preventing costly repairs, production downtime, and poor-quality products.

Extended Instrument Lifespan

Regular calibration can extend the life of measurement instruments. By detecting and correcting issues early, instruments remain in good working condition for an extended period of time.

This practical guide will provide a detailed walkthrough on how to calibrate a digital pressure gauge, ensuring users can perform calibration effectively and safely.

1. Understand Your Digital Pressure Gauge: Familiarise yourself with your specific model of digital pressure gauge and its functions. Refer to the manual for any specific calibration instructions or requirements.
2. Prepare Calibration Equipment: You will need a high-accuracy standard pressure gauge or a pressure calibrator as a reference. Ensure that the reference device has a higher accuracy level than the digital gauge being calibrated, and that the reference device is calibrated. 
3. Create a Stable Environment: Conduct the calibration in an environment with minimal temperature fluctuations and vibrations. Digital gauges can be sensitive to environmental changes. Note the temperature so you can report it along with calibration results.
4. Connect the Gauges: Safely connect your digital pressure gauge and the standard/reference gauge to a common pressure source. Ensure all connections are leak-proof.
5. Zero Calibration: Start with zero calibration. With no pressure applied, ensure that the digital gauge reads zero. If it doesn’t, use the zero calibration function (if available) to adjust it.
6. Apply Pressure Gradually: Slowly increase the pressure from your source. Digital gauges respond quickly, so a gradual increase helps in stabilising the readings.
7. Record Readings at Various Points: At multiple points along the gauge’s range (such as 25%, 50%, 75%, and 100% of its full scale, or according to a standard e.g. MSA Test Method 1), record the readings from both the digital gauge and the reference gauge. Allow a moment for the readings to stabilise before recording.

Compare and Analyse Readings: Compare the readings from your digital gauge with those from the reference. The readings should be within the acceptable error range specified by the gauge’s manufacturer. Any significant deviation may indicate a need for adjustment or servicing.

Temperature Variations

The effect of temperature on both the gauge and the calibration equipment is significant. Gauges may give different readings at different temperatures. It’s important to calibrate in a temperature-controlled environment to ensure accuracy. Refer to user manuals for temperature operation range.

Gauge Sensitivity

Highly sensitive gauges require more frequent and precise calibration. The sensitivity of the gauge determines the level of accuracy needed in the calibration process.

Determining when and how often to calibrate involves understanding various factors that can influence the performance of your gauge. Here’s a guide to help you establish an effective calibration schedule for your digital pressure gauge.

Initial Calibration

Upon Purchase: Calibrate your digital pressure gauge immediately after purchase to ensure it meets your specific requirements and accuracy standards.

Scheduled Calibration

Regular Intervals: Establish a routine calibration schedule. The frequency depends on factors like the gauge’s usage rate, manufacturer recommendations, and the critical nature of its measurements.

Industry Standards: Follow industry-specific standards or regulatory requirements that may dictate calibration intervals.

Usage-Based Calibration

High-Frequency Use: If the gauge is used frequently or in critical processes, increase the calibration frequency to ensure consistent accuracy.

After Significant Events: Recalibrate after events that could impact accuracy, such as mechanical impacts, exposure to extreme conditions, or major changes in the operational environment.

Performance Indicators

Inconsistent Readings: If the gauge starts showing inconsistent or drifting readings, it should be calibrated immediately.

After Repairs: Calibration is necessary after any repair or replacement of parts.

Preventive Maintenance

Regular Checks: Incorporate calibration checks into your regular maintenance schedule to preemptively catch any accuracy issues.

Environmental Factors

Changing Conditions: If the gauge is used in varying environmental conditions (temperature, humidity, etc.), more frequent calibration may be required.

Calibration Process

Use Certified Standards: Ensure the calibration is done using standards that are traceable and have a known higher accuracy.

Document the Process: Keep detailed records of each calibration, including the date, conditions, results, and any adjustments made.

All services including repairs and calibrations are subject to our standard terms and conditions