
Specs at a glance
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Input
1x Puls/Analog
2x RTD/Analog
Loop power supply 24V DC (+/-16%) -
Output
1x 4...20mA
2x digital (Open Collector) -
Display
160 x 80 Dot-Matrix LCD with white backlit
colour change in case of alarm event
active display area 70 x 34 mm -
Calculations
heat quantity and heat quantity difference
Field of application
The BTU meter RH33 is used in applications with liquid energy carriers.
It calculates the thermal energy of water acc. to EN1434, glycol/water mixtures or other fluids such as thermal oils. Temperature sensor matching using calibrated temperature sensors is done in the device.
Potential for cost savings can be shown by using the software available as an accessory.
The device has a custody transfer approval and allows bi-directional measurement, e.g. charging/discharging of a heat accumulator.
Recording and billing the quantities of heat and cold in:
Heating circuits
Cooling circuits
Combined heating and cooling circuits
Typical application areas in industry, long-distance heat networks and building automation.
Benefits
Transparent energy consumption helps you save on energy costs
Calibrated, electronically paired temperature sensors ensure the highest accuracy and enable replacement of individual temperature sensors even for certified devices in the field (without reapproval!)
Tariff counter for requirements-based billing
Detailed data logging of current and counter values and of error messages, off-limit conditions and changes to operating parameters
Standard models are suitable for connecting and supplying all common volume flow transmitters and temperature measuring points
Remote readout via Ethernet and fieldbuses
Verified and certified reliability and accuracy
Videos
Lean selection
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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity

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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
-
Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
---|---|---|
Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
|
Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
|
Xpert selection Master your most challenging applications |
Technical excellence
|
Simplicity
Variable |
Success stories
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Measuring principle
Energy manager
-
Measuring principle
Energy manager
-
Function
Monitoring and billing of energy in heating and cooling applications as well as combined heating-and cooling circles.
Typical applications can be found in industries, district heating and building automation. -
Calculations
heat quantity and heat quantity difference
-
Number of applications
1
-
Calculation standards
IAPWS-97
-
Communication
web server
USB
Ethernet
Modbus RTU/TCP Slave
M-Bus -
Power supply
Not defined
-
Loop power supply
Low voltage power supply:
100 bis 230 V AC (-15% / +10%)
Small voltage power supply:
24 V DC (-50% / +75%)
24 V AC (±50%) -
Protection class
IP65
-
Input
1x Puls/Analog
2x RTD/Analog
Loop power supply 24V DC (+/-16%) -
Output
1x 4...20mA
2x digital (Open Collector) -
Dimensions (WxHxD)
144 x 144 x 103.1 mm (5.67" x 5.67" x 4.06")
-
Operation
3 button on site or via FieldCare
read out of historical / logged data via Field Data Manager Software (SQL database and visualization interface)
selectable language -
Display
160 x 80 Dot-Matrix LCD with white backlit
colour change in case of alarm event
active display area 70 x 34 mm -
Software functions
Calculated Values:
Energy, volume, density, enthalpy & enthalpy difference, DP-Flow-Compensation, mass, temperature difference
Counters:
Volume, mass, energy, counter in case of failure
Optional:
tariff 1, tariff 2 or seperated heating energy, cooling energy, bilance energy -
Certificates
CE
CSA GP
MID 004 (custody transfer) according EN1434 (water/other liquids)
OIML R75
-
Measuring principle
Energy manager
-
Function
Monitoring and billing of energy in heating and cooling applications as well as combined heating-and cooling circles.
Typical applications can be found in industries, district heating and building automation. -
Certification
CE, UL listed, CSA GP, MID 004 (custody transfer) according EN1434 (water/other liquids) and OIML R75
-
Input
1x Puls/Analog,
2x RTD/Analog,
Loop power supply 24V DC (+/-16%) -
Output
1x 4...20mA,
2x digital (Open Collector) -
Relay output
2x
-
Auxiliary power supply
Low voltage power supply: 100 bis 230 V AC (-15% / +10%); Small voltage power supply: 24 V DC (-50% / +75%), 24 V AC (±50%)
-
Dimensions (wxhxd)
144 x 144 x 103.1 mm
(5.67" x 5.67" x 4.06") -
Software
Calculated Values:
Energy, volume, density, enthalpy & enthalpy difference,
DP-Flow-Compensation,
mass,
temperature difference;
Counters: volume, mass, energy, counter in case of failure
Optional: tariff 1, tariff 2 or seperated heating energy, cooling energy, bilance energy -
Operation
3 button on site or via FieldCare; read out of historical / logged data via Field Data Manager Software (SQL database and visualization interface), selectable language
-
Display
160 x 80 Dot-Matrix LCD with white backlit, colour change in case of alarm event, active display area 70 x 34 mm
-
Others
electronic temperature sensor matching via CvD coefficients, logbook measured values, custody transfer logbook, event logbook, limit monitoring
-
Calculations
IAPWS-IF97
-
-
Technical Information (TI)
EngyCal RH33
English version - 09/2021
New version available in English
Custody transfer BTU meter for recording and billing heat and cold quantities of water, water/glycol mixtures or other fluids
EN More 30/09/202128/12/201807/02/201406/09/201108/04/2010Language:
English
Version:
30/09/2021
File size:
995.5 KB
File name:
TI00151KEN_0421.pdf
-
-
-
Operating Instruction (BA)
EngyCal RH33
English version - 07/2021
New version available in English
Universal BTU meter
EN More 31/07/202128/12/201806/04/201607/10/201428/01/2014Language:
English
Version:
31/07/2021
File size:
3.9 MB
File name:
BA00290KEN_0721.pdf
-
-
-
Technical Information (TI)
Technical Information EngyCal® RH33
-
Technical Information (TI)
English version - 03/2010Technical Information EngyCal® RH33 Custody transfer BTU meter for
recording and billing the heat/
cold quantity given off by water, water/glycol mixtures or other
liquidsEN Select other language 01/03/2010Language:
English
Version:
01/03/2010
File size:
846.8 KB
File name:
TI151Ren_0310.pdf
-
-
-
Technical Information (TI)
EngyCal RH33
-
Technical Information (TI)
English version - 09/2021Custody transfer BTU meter for recording and billing heat and cold
quantities of water, water/glycol mixtures or other fluidsEN Select other language 30/09/202128/12/201807/02/201406/09/201108/04/2010Language:
English
Version:
30/09/2021
File size:
995.5 KB
File name:
TI00151KEN_0421.pdf
-
-
-
Operating Instruction (BA)
EngyCal RH33
-
Operating Instruction (BA)
English version - 07/2021Universal BTU meter
EN Select other language 31/07/202128/12/201806/04/201607/10/201428/01/2014Language:
English
Version:
31/07/2021
File size:
3.9 MB
File name:
BA00290KEN_0721.pdf
-
-
-
Operating Instruction (BA)
EngyCal RH33 and RS33 and Batch Controller RA33 Operating Instructions
-
Operating Instruction (BA)
English version - 06/2016Additional operating instructions Modbus for BTU meter RH33, Steam
calculator RS33 and Batch Controller RA33EN Select other language 24/06/201616/11/2010Language:
English
Version:
24/06/2016
File size:
291.3 KB
File name:
BA01029KEN_1416.pdf
-
-
-
Operating Instruction (BA)
FDM Field Data Manager Software MS20, MS21
-
Operating Instruction (BA)
English version - 10/2021Data management and visualization
EN Select other language 04/10/202127/07/202109/05/201916/05/201724/03/2016Language:
English
Version:
04/10/2021
File size:
5.9 MB
File name:
BA00288R09EN_1221.pdf
-
-
-
Short Instruction (KA)
EngyCal RH33
-
Short Instruction (KA)
English version - 09/2021Universal BTU meter
EN Select other language 16/09/202122/09/201430/01/201401/08/201120/07/2010Language:
English
Version:
16/09/2021
File size:
2.2 MB
File name:
KA00289KEN_0421.pdf
-
-
-
Installation Instructions (EA)
71144242
-
Installation Instructions (EA)
English version - 01/2025Freischaltung einer Software Option
EN Select other language 30/01/2025Language:
English
Version:
30/01/2025
File size:
1.9 MB
File name:
71144242.pdf
-
-
-
Installation Instructions (EA)
XPR0002-xx
-
Installation Instructions (EA)
English version - 01/2025Einbauanteiltung zum Austausch CPU-Karte Rx33
EN Select other language 29/01/2025Language:
English
Version:
29/01/2025
File size:
2.1 MB
File name:
71122642.pdf
-
-
-
Installation Instructions (EA)
XPR0001-xx
-
Installation Instructions (EA)
English version - 01/2025Einbauanleitung für den Austausch der Kommunikationkarte
EN Select other language 30/01/2025Language:
English
Version:
30/01/2025
File size:
2.8 MB
File name:
71122645.pdf
-
-
-
Installation Instructions (EA)
XPR0001-xx
-
Installation Instructions (EA)
English version - 01/2025Einbauanleitung Austausch Gehäusefront, Gehäuseunterteil,
ElektronikabdeckungEN Select other language 30/01/2025Language:
English
Version:
30/01/2025
File size:
2.7 MB
File name:
71122644.pdf
-
-
-
Installation Instructions (EA)
XPR0003-xx
-
Installation Instructions (EA)
English version - 01/2025Einbauanleitung für den Austausch des Mainboard
EN Select other language 30/01/2025Language:
English
Version:
30/01/2025
File size:
2 MB
File name:
71122646.pdf
-
-
-
Special Documentation (SD)
Device viewer
-
Special Documentation (SD)
English version - 07/2021Technical documentation in other languages
Language:
English
Version:
14/07/2021
File size:
478.5 KB
File name:
SD02429R09EN_0121.pdf
-
-
-
Manufacturer Information (MI)
Manufacturer information RH33
-
Manufacturer Information (MI)
English version - 01/2014Software update to new Firmware for EngyCal RH33
EN Select other language 31/01/2014Language:
English
Version:
31/01/2014
File size:
119.4 KB
File name:
MI01256KEN_0114.pdf
-
-
-
PU (Publication)
Úspory energie v technologických zařízeních
-
PU (Publication)
Czech version - 03/2024Řešení pro páru,
stlačený vzduch,
vytápění, chlazení
a průmyslové plynyLanguage:
Czech
Version:
14/03/2024
File size:
26.8 MB
File name:
PU01539ZCS0124_Energy_savings_Utilities_eBook.pdf
-
-
-
PU (Publication)
Energy savings in utilities: Solutions for steam, compressed air, heating, cooling and industrial gases
-
PU (Publication)
English version - 12/2023Solutions for steam, compressed air,
heating, cooling and industrial gasesLanguage:
English
Version:
07/12/2023
File size:
9.8 MB
File name:
PU01539Z24EN012300_US VersionEnergy_savings_Utilities_eBook.pdf
-
-
-
PU (Publication)
公用工程的节能方案
-
PU (Publication)
Chinese version - 09/2023蒸汽、压缩空气、加热、冷却和工业气体解决方案
Language:
Chinese
Version:
25/09/2023
File size:
16.1 MB
File name:
CP01518S_0123_Energy_savings_Utilities_eBook_ZH.pdf
-
-
-
PU (Publication)
Risparmio energetico nelle utility
-
PU (Publication)
Italian version - 03/2024Soluzioni per vapore,
aria compressa, riscaldamento,
raffreddamento e gas industrialiLanguage:
Italian
Version:
14/03/2024
File size:
5.3 MB
File name:
PU01539ZIT_0123.pdf
-
-
-
PU (Publication)
Ahorro energético en servicios generales: Soluciones para vapor, aire comprimido, calefacción, refrigeración y gases industriales
-
PU (Publication)
Spanish version - 04/2024Soluciones para vapor, aire comprimido,
calefacción, refrigeración y gases industrialesLanguage:
Spanish
Version:
30/04/2024
File size:
10.2 MB
File name:
ES_PU01539Z_0123_Energy_savings_Utilities_eBook_Global.pdf
-
-
-
PU (Publication)
Решения для систем, работающих с паром
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PU (Publication)
Russian version - 04/2024Решения для систем, работающих с паром
Language:
Russian
Version:
25/04/2024
File size:
10.4 MB
File name:
PU01539Z_0123_Energy_savings_Utilities_eBook_Global-ru.pdf
-
-
-
PU (Publication)
E-book Energiebesparingen in utiliteiten
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PU (Publication)
Dutch version - 03/2024Oplossingen voor stoom, perslucht,
verwarming, koeling en industriële gassenLanguage:
Dutch
Version:
27/03/2024
File size:
8.5 MB
File name:
PU01539Z15NL0124_eBook Energiebesparingen in utiliteiten.pdf
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