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Custody Transfer BTU Meter RH33

Input
Puls/Analog Inputs: 1
RTD/Analog Inputs: 2
Loop Power Supply: 24V DC (+/-16%)

Output

Analog Output: 1 x 4…20 mA
Digital Outputs: 2 (Open Collector)

Display
Type: 160 x 80 Dot-Matrix LCD with white backlight
Alarm Indication: Color change during alarm events
Active Display Area: 70 x 34 mm

Calculations
Heat Quantity and Heat Quantity Difference
Power Supply
Low Voltage Power Supply: 100 to 230 V AC (-15% / +10%)
Small Voltage Power Supply:
24 V DC (-50% / +75%)
24 V AC (±50%)

Dimensions
Size (WxHxD): 144 x 144 x 103.1 mm (5.67″ x 5.67″ x 4.06″)

Protection Class
IP65

Communication Interfaces
Web Server
USB
Ethernet
Modbus RTU/TCP Slave
M-Bus

Certificates
CE
CSA GP
MID 004 (Custody Transfer) according to EN1434 (for water and other liquids)
OIML R75

Benefits

  • Transparent Energy Consumption:
    Helps users save on energy costs through detailed monitoring.
  • High Accuracy:
    Calibrated, electronically paired temperature sensors ensure high precision, allowing for easy replacement of individual sensors in the field without requiring reapproval.
  • Tariff Counter:
    Enables requirements-based billing.
  • Detailed Data Logging:
    Logs current and counter values, error messages, off-limit conditions, and changes to operating parameters.
  • Standard Compatibility:
    Models connect to common volume flow transmitters and temperature measuring points.
  • Remote Readout:
    Supports data access via Ethernet and fieldbuses.
  • Verified Reliability:
    Ensures certified accuracy and reliability for energy measurement.

Field of Application

The BTU Meter RH33 is designed for use with liquid energy carriers. It calculates the thermal energy of water according to EN1434, glycol/water mixtures, or other fluids, including thermal oils. It utilizes calibrated temperature sensors for precise temperature matching, making it suitable for various energy monitoring applications.

Typical Applications Include:

  • Heating Circuits
  • Cooling Circuits
  • Combined Heating and Cooling Circuits
  • Common in industries, long-distance heating networks, and building automation.

Measuring Principle

The BTU Meter RH33 functions as an Energy Manager, facilitating the monitoring and billing of energy in heating and cooling applications, as well as combined heating-and-cooling systems. It adheres to the IAPWS-97 calculation standards for accurate thermal energy measurement.