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Insertion electromagnetic BTU / energy meter · BACnet points list
Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP BACnet points list
Updated 12 November 2026
The IEFB is an insertion electromagnetic flow meter with two RTDs that calculates heating and cooling energy. The RS-485 port runs Modbus RTU by default or BACnet MS/TP, set from the display. Over BACnet it reports velocity and both temperatures as Analog Inputs, and flow, power, energy totals, delta T and year/month peak values as Analog Values, with status bitstrings, peak dates and a few writable setup values.
This page lists 33 BACnet objects for the Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP — 7 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Dwyer’s own free documentation, linked below.
- Manufacturer
- Dwyer
- Model
- Series IEFB insertion thermal energy meter, BACnet MS/TP
- Equipment
- Insertion electromagnetic BTU / energy meter
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 33 (7 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Default device instance
- 607000 + MS/TP address (607xxx)
- Also known as
- IEFB, Series IEFB, IEFB BTU meter, DwyerOmega IEFB, Series IEF energy meter, F-IEFB
Reference only, provided as-is: verify against Dwyer’s current documentation and the live device before use. Not official Dwyer information. Terms of use.
BMS integration notes: Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP
Pick BACnet in the display's communication wizard, set an address 0-127, then read power, the heat and cooling energy totals, flow and both temperatures. Set glycol concentration and process pressure to match the system so the energy maths is right.
Minimum points to map
The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.
| Object | Name | Why | Access |
|---|---|---|---|
| AV 4 | Power | Thermal power | Read |
| AV 6 | Heat Energy | Heating energy total | Read |
| AV 7 | Cooling Energy | Cooling energy total | Read |
| AV 1 | Volume Flow | Volumetric flow | Read |
| AI 2 | Inlet Temperature | Supply water temperature | Read |
| AI 3 | Outlet Temperature | Return water temperature | Read |
| BV 2 | Empty Pipe | Empty pipe (no fluid at the probe) | Read |
| Other 2 | Energy Meter Status Flags | Energy meter error bits | Read |
Network setup
- Protocol, address and serial settings are set from the display; the factory protocol is Modbus RTU.
- BACnet addresses run 0-127; the device instance defaults to 607xxx and follows the address until written.
- A J1 jumper on the terminal board switches in the 120 ohm termination resistor (default off).
Watch out for
- Glycol concentration (AV 17) and process pressure (AV 16) feed the energy calculation.
- Heat Changeover Temperature (AV 15) decides whether energy counts as heating or cooling.
- Writing BV 4 resets all energy totals, peaks, peak dates and the hour counter.
Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP BACnet objects
Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AI | 1 | Velocity | Flow velocity at the probe | ft/s | Read | |
| AImin | 2 | Inlet Temperature | Supply (inlet) water temperature | °C | Read | |
| AImin | 3 | Outlet Temperature | Return (outlet) water temperature | °C | Read | |
| AVmin | 1 | Volume Flow | Volumetric flow rate | ft³/s | Read | |
| AV | 2 | Mass Flow | Mass flow rate | lb/s | Read | |
| AV | 3 | Total Flow | Flow total | US gal | Read | |
| AVmin | 4 | Power | Thermal power | kW | Read | |
| AV | 5 | Total Energy | Total energy | kJ | Read | |
| AVmin | 6 | Heat Energy | Heating energy total | kJ | Read | |
| AVmin | 7 | Cooling Energy | Cooling energy total | kJ | Read | |
| AV | 8 | Differential Temperature | Inlet minus outlet temperature | °C | Read | |
| AV | 9 | YTD Max Power | Year-to-date maximum power | Read | ||
| AV | 10 | YTD Min Power | Year-to-date minimum power | Read | ||
| AV | 11 | MTD Max Power | Month-to-date maximum power | Read | ||
| AV | 12 | MTD Min Power | Month-to-date minimum power | Read | ||
| AV | 13 | Inlet YTD Average Temperature | Year-to-date average inlet temperature | °C | Read | |
| AV | 14 | Outlet YTD Average Temperature | Year-to-date average outlet temperature | °C | Read | |
| AV | 15 | Heat Changeover Temperature | Inlet temp above which energy counts as heat, 0-120 °C | °C | Write | |
| AV | 16 | Process Pressure | Line pressure used in energy calc, default 232.06 | psi | Write | |
| AV | 17 | Ethylene Glycol Concentration | Glycol by volume, 0-100 % | % | Write | |
| BV | 1 | Reverse Flow | Flow reversed relative to label arrow | Read | 0=Not reversed, 1=Reversed | |
| BVmin | 2 | Empty Pipe | No process fluid at the probe | Read | 0=Fluid detected, 1=Fluid not detected | |
| BV | 3 | Reset Total Flow | Write 1 to zero the flow total | Write | 0=Inactive, 1=Active | |
| BV | 4 | Reset Energy Statistics | Write 1 to reset energy totals and statistics | Write | 0=Inactive, 1=Active | |
| Other | 1 | Flow Meter Status Flags | BitString Value: flow board error bits 0-12 | Read | ||
| Othermin | 2 | Energy Meter Status Flags | BitString Value: energy board error bits 0-15 | Read | ||
| Other | 1 | YTD Max Power Date | Date Value: date of YTD max power | Read | ||
| Other | 2 | YTD Min Power Date | Date Value: date of YTD min power | Read | ||
| Other | 3 | MTD Max Power Date | Date Value: date of MTD max power | Read | ||
| Other | 4 | MTD Min Power Date | Date Value: date of MTD min power | Read | ||
| MV | 1 | Velocity Probe Location | Pipe the probe is fitted in | Write | 1=Inlet, 2=Outlet | |
| MV | 2 | RTD Locations | Which RTD is in which pipe | Write | 1=RTD1 in Inlet/RTD2 in Outlet, 2=RTD1 in Outlet/RTD2 in Inlet | |
| PIV | 1 | Energy Hour Counter | Energy hour counter | h | Read |
No points match these filters.
Object ID lookup: Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP point IDs by name
AI1VelocityAI2Inlet TemperatureAI3Outlet TemperatureAV1Volume FlowAV2Mass FlowAV3Total FlowAV4PowerAV5Total EnergyAV6Heat EnergyAV7Cooling EnergyAV8Differential TemperatureAV9YTD Max PowerAV10YTD Min PowerAV11MTD Max PowerAV12MTD Min PowerAV13Inlet YTD Average TemperatureAV14Outlet YTD Average TemperatureAV15Heat Changeover TemperatureAV16Process PressureAV17Ethylene Glycol ConcentrationBV1Reverse FlowBV2Empty PipeBV3Reset Total FlowBV4Reset Energy StatisticsMV1Velocity Probe LocationMV2RTD LocationsPIV1Energy Hour Counter
Integration notes
- Units shown are the printed defaults; the Units property of most analog objects is writable, so the site may use other units.
- The property tables for AV 9-12 (power peaks) show kilojoules as the default unit; units are left blank here.
- The manual prints the AV 8 property table under the AV 7 Cooling Energy heading; the overview table names AV 8 Differential Temperature.
- Bit-String Values BSV 1-2 and Date Values DV 1-4 are listed as Other with their printed instances (BSV 1-2, DV 1-4); the description says which object type each is.
- The MSV 2 property table repeats the name "Velocity Probe Location"; the overview table names it RTD Locations.
Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the Series IEFB insertion thermal energy meter, BACnet MS/TP and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.
Questions about the Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP
How many BACnet points does the Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP have?
This list has 33 BACnet objects: 3 analog inputs, 17 analog values, 4 binary values, 2 multi-state values, 1 positive integer value, 6 others. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP BACnet points are writable?
7 of the 33 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done.
Where is the official Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP BACnet documentation?
The source is Series IEFB Insertion Thermal Energy Meter - Specifications, Installation and Operating Instructions (Bulletin F-IEFB (FR# 444531-00 Rev. 2)), revision 11/20, published free by Dwyer at https://assets.omega.com/manuals/F_IEFB.pdf.
What are the minimum BACnet points to integrate the Dwyer Series IEFB insertion thermal energy meter, BACnet MS/TP?
Start with AV 4 Power (Thermal power); AV 6 Heat Energy (Heating energy total); AV 7 Cooling Energy (Cooling energy total); AV 1 Volume Flow (Volumetric flow); AI 2 Inlet Temperature (Supply water temperature); AI 3 Outlet Temperature (Return water temperature); BV 2 Empty Pipe (Empty pipe (no fluid at the probe)); Other 2 Energy Meter Status Flags (Energy meter error bits).
How do I check these points on the real Series IEFB insertion thermal energy meter, BACnet MS/TP?
Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.
More Dwyer BACnet points lists
- Airflow velocity sensor
Dwyer Series AVLV low air velocity transmitter, BACnet MS/TP
Dwyer Series AVLV low air velocity transmitters (100-400 FPM ranges) with the BACnet MS/TP option.
Also known as: AVLV, Series AVLV, AVLV BACnet, DwyerOmega AVLV, P-AVLV-B - Duct airflow velocity sensor
Dwyer Series AVPT pencil-style air velocity transmitter, BACnet MS/TP
Dwyer Series AVPT thermal-anemometer duct velocity transmitters ordered with the BACnet MS/TP output.
Also known as: AVPT, Series AVPT, AVPT BACnet, DwyerOmega AVPT, AVPT pencil style air velocity transmitter - CO2, humidity and temperature room sensor
Dwyer Series CDTA / CDTC Communicating CO2 Detector
Dwyer Series CDTA (CO2, humidity, temperature) and CDTC (CO2, temperature) wall-mount detectors with setpoint and override, BACnet MS/TP or Modbus RTU.
Also known as: CDTA, CDTC, CDTA-2N000, CDTA-5N000, CDTC-2N000, CDTC-5N000, CDTA-2N000-LCD - Differential pressure sensor / controller
Dwyer Series DHC Digihelic differential pressure controller, BACnet MS/TP
Dwyer Series DHC Digihelic panel-mount differential pressure controllers with two relays, analog outputs and RS-485 set to BACnet MS/TP.
Also known as: DHC, Series DHC, Digihelic, Digihelic DHC, DwyerOmega DHC, DHC-xxx-xxx - CO / NO2 gas sensor
Dwyer Series GSTC carbon monoxide / nitrogen dioxide gas transmitter, BACnet MS/TP
Dwyer Series GSTC carbon monoxide (GSTC-C) and nitrogen dioxide (GSTC-N) gas transmitters with switch-selectable BACnet MS/TP or Modbus RTU.
Also known as: GSTC, GSTC-C, GSTC-N, Series GSTC, DwyerOmega GSTC, CO Detector, NO2 Detector - Differential pressure and airflow sensor
Dwyer Series MS2 Magnesense II Differential Pressure Transmitter with BACnet (MS2-B)
Dwyer Series MS2 Magnesense II differential pressure transmitters with BACnet MS/TP (ranges up to 25 in. w.c.).
Also known as: MS2-B, MS2, Magnesense II, P-MS2-B - Differential pressure sensor / transmitter
Dwyer Series MSX-Comms Magnesense Pressure Transmitter
Dwyer Series MSX-Comms Magnesense differential pressure transmitters with BACnet MS/TP or Modbus RTU output.
Also known as: MSX, MSX-Comms, Magnesense MSX, DwyerOmega MSX, MSX BACnet - Humidity and temperature sensor
Dwyer Series RHPX humidity/temperature communicating transmitter, BACnet MS/TP
Dwyer Series RHPX duct, space and outdoor humidity/temperature transmitters with the BACnet MS/TP / Modbus RTU communication option.
Also known as: RHPX, Series RHPX, RHPX Comms, RHPX BACnet, DwyerOmega RHPX, AQ-RHPX-C - Room pressure monitor
Dwyer Series RSME / RSMC Room Status Monitor
Dwyer Series RSME/RSMC room status monitors (built-in differential pressure plus universal and external BACnet inputs) for isolation rooms, labs and cleanrooms.
Also known as: RSME, RSMC, Series RSME, Series RSMC, DwyerOmega RSME, Dwyer room pressure monitor - Ultrasonic BTU / energy meter
Dwyer Series TUF ultrasonic energy meter, BACnet MS/TP (TUF-B)
Dwyer Series TUF ultrasonic heating/cooling energy meters (TUF-150 to TUF-2000) ordered with BACnet MS/TP.
Also known as: TUF, TUF-B, TUF BACnet, Dwyer TUF BTU meter, DwyerOmega TUF
Source: Series IEFB Insertion Thermal Energy Meter - Specifications, Installation and Operating Instructions · Bulletin F-IEFB (FR# 444531-00 Rev. 2) · rev. 11/20. Object names, instances and units are reproduced as published; descriptions are our own.