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Nagman Instruments
Nagman Calibration
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BTU Meter Verifications

BTU Meter Verifications

Nagman Flow provides expert verification and calibration services for BTU (British Thermal Unit) meters, also known as Energy Meters. These meters are critical for measuring heat energy consumption in chilled water systems and district cooling. Since BTU meters calculate energy based on both flow rate and temperature difference, our verification process ensures that all integrated components—the flow sensor, the temperature probes, and the calculator—are working together with absolute precision to ensure fair billing and energy efficiency.

Key Features

  • System-Wide Accuracy: We verify the entire thermal energy measurement loop, ensuring the flow sensor and temperature pairs are perfectly synchronized.
  • High-Precision Temperature Simulation: Using stable dry blocks or liquid baths to simulate exact temperature differences across the supply and return lines.
  • Flow Measurement Integrity: Testing the flow sensor element against high-accuracy master meters to ensure volumetric precision.
  • Error Analysis & Reporting: Automated calculation of energy measurement errors compared to theoretical energy values.
  • Compliance Certification: Detailed verification reports provided for building management systems (BMS) and regulatory audits.

Types of Calibrations / Tests Available

The calibration bench supports the following tests commonly required for meter validation:

  • Endurance Test – long-term durability validation
  • Accuracy Test – ensures measurement reliability
  • Orientation Test – performance across installation positions
  • Reverse Flow Test – behavior under backflow conditions
  • Static Pressure Test – strength under high pressure
  • Temperature Test – effect of varying fluid temperatures
  • Flow Disturbance Test – real-world installation simulation
  • Pressure Loss Test – head loss measurement
  • Position Change Test – accuracy after repositioning

Single Jet Water Meters

Multi Jet Water Meters

Multi Jet Water Meters

Electromagnetic Water Meters

Electromagnetic Water Meters

Ultrasonic Water Meters

Ultrasonic Water Meters

Automatic operation with Gravimetric principle

Automatic operation with Gravimetric principle

Suitable for DN 15 – DN 50 water meters

Suitable for DN 15 – DN 50 water meters

Complies with BIS 779 & ISO 4064

Complies with BIS 779 & ISO 4064

Capable of 9+ different tests

Capable of 9+ different tests

Meter Sizes DN 15 / DN 20 / DN 25 / DN 50
Flow Range Minimum 30 LPH to Maximum 7000 LPH (0.03 to 7 m³/hr)
System Operation Automatic
Method of Calibration Gravimetric
Number of Test Line Single
Calibration Media Water
Number of meters can be Calibrated at a time 5 Nos. of Water Meters of Size DN 15 (OR)
4 Nos. of Water Meters of Size DN 20 (OR)
3 Nos. of Water Meters of Size DN 25
Reference Meters 1 No. of Each Calibrated & Certified Electromagnetic Flow Meters of Sizes
DN 6 – Flow Range: 30 LPH to 1000 LPH (0.03 to 1 m³/hr) Accuracy: ± 0.5% of Reading
DN 25 – Flow Range: 800 LPH to 17000 LPH (0.8 to 17 m³/hr) Accuracy: ± 0.2% of Reading
Meter Clamping Pneumatic Clamping System
Compressed Air 6 bar through Oil free Compressor for Pneumatic Clamping & Pneumatic operated Valves
Flow Control Through VFD’s Connected to the Pumps & Electrically operated control Valves
Water supply – Through Pumps 10 m³/hr @ 16 Bar, 7.5 Kw / 3Phase/ 50Hz
Pressure Measurement Pressure Transmitter (Inlet / Outlet) Range: 0 to 16 bar
Temperature Measurement RTD with Temperature Transmitter Range: 0 to 100°C (class A)
Damping Tank Capacity 100 liters; MOC: MS Powder Coated inside, epoxy coated
Collection Tank & Weighing Scale (IND 360 WITH PROFINET COMMUNICATION) A 25 Liters Collection Tank mounted on a 30 Kg Weighing Scale (Resolution: 5 g)
A 125 Liters Collection Tank mounted on a 30 Kg Weighing Scale (Resolution: 20 g)
Optical Heads / Optical Probes Suitable Probes or communications cables will be provided for getting the test meter reading in automode. (Pending) – Pulse/RS485
Endurance

Endurance

Orientation

Orientation

Accuracy

Reverse Flow

Reverse Flow

Temperature

Temperature

Static Pressure

Flow Disturbance

Flow Disturbance

Position Change

Position Change

Pressure Loss

FAQs

1. What is a Calibration Bench for Domestic Water Meters?
A calibration bench is a specialized system designed to validate domestic water meters’ performance in terms of accuracy, durability, and compliance against standards such as BIS 779 and ISO 4064.
2. What tests can be performed using the calibration bench?
The bench supports 9 calibration tests: accuracy, endurance, orientation, reverse flow, static pressure, temperature, flow disturbance, pressure loss, and position change. If you require additional or custom tests, we can discuss them.
3. Which water meter sizes are supported?
The system is configured for domestic meters ranging from DN 15 to DN 25, covering commonly used residential water meter sizes. It accommodates single jet, multi jet, electromagnetic, and ultrasonic types.
4. Who should use this calibration service?
This solution is ideal for water meter manufacturers, certification agencies, R&D labs, and municipal utilities seeking validation, verification, or periodic calibration of their water meters.
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    Nagman Complex, No. 168/7, Chennai-Bangalore NH-4, Chembarambakkam,
    Chennai – 600 123.
    Tamil Nadu, INDIA.

    An ISO 9001:2015 Certified Instrumentation Company

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