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Ultrasonic liquid flow sensor · BACnet points list
Belimo 22PF Flow Sensor BACnet points list
Updated 28 October 2026
The 22PF is an ultrasonic flow meter for hydronic pipes with a built-in flow-body temperature sensor and glycol detection. On BACnet MS/TP it reports absolute and relative flow, accumulated volume, temperature, glycol concentration and status, plus an extra sensor input. It has no setpoint or control objects; it is a monitoring device.
This page lists 21 BACnet objects for the Belimo 22PF Flow Sensor — 5 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Belimo’s own free documentation, linked below.
- Manufacturer
- Belimo
- Model
- 22PF Flow Sensor
- Equipment
- Ultrasonic liquid flow sensor
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 21 (5 writable)
- Transport
- BACnet MS/TP
- Firmware
- FM 4.3.0, firmware 02.00.0003
- Default device instance
- 1
- Also known as
- 22PF, 22PF-.., Belimo ultrasonic flow sensor, Flow Sensor 22PF
BMS integration notes: Belimo 22PF Flow Sensor
Pure monitoring device: set the engineering units once (MV 123, MV 126, MV 127), then poll or COV-subscribe flow, volume and temperature. Use MV 99 SummaryStatus and AV 140 ErrorState for alarms.
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 19 | AbsFlow_UnitSel | Measured flow | Read |
| AI 23 | T_UnitSel | Water temperature at the flow body | Read |
| AV 52 | Volume_UnitSel | Totalized volume | Read |
| AV 60 | GlycolConcentration | Glycol content of the medium | Read |
| MV 99 | SummaryStatus | Overall OK / warning / not OK | Read |
| AV 140 | ErrorState | Bit-coded fault and warning flags | Read |
Sensors & values from the BMS
Sensor 1 on Y3 can be read over BACnet as a voltage (AI 20) or switch (BI 20) once MV 220 is set to that type.
Network setup
- MS/TP: baud 9600-115200, default 38400; MAC address 0-127, default 1; max 32 nodes without repeater.
- Default device instance 1.
- MS/TP MAC and baud can also be changed through the Network Port object (NPO 101).
- Configure with Belimo Assistant 2; bus termination is set there and shown in BV 99.
Watch out for
- Writable persistent objects must not be written on a regular basis.
- Changing unit-select MVs changes the units of the flow, volume and temperature objects; update BMS scaling.
- Max 5 active COV subscriptions.
Belimo 22PF Flow Sensor 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 | |||||
|---|---|---|---|---|---|---|
| Other | 101 | Network Port Object | MS/TP network port (MAC, baud, max master) | Write | ||
| BV | 99 | BusTermination | 120 Ω bus termination enabled | Read | 0=Disabled, 1=Enabled | |
| AV | 10 | RelFlow | Flow relative to full scale (AV 100) | % | Read | |
| AVmin | 19 | AbsFlow_UnitSel | Measured absolute flow | m³/s, m³/h, l/s, l/min, l/h, gpm or cfm (MV 123) | Read | |
| AV | 100 | FS_UnitSel | Full-scale (nominal) flow | m³/s, m³/h, l/s, l/min, l/h, gpm or cfm (MV 123) | Read | |
| MV | 123 | UnitSelFlow | Engineering unit for flow objects | Write | 1=m³/s, 2=m³/h, 3=l/s, 4=l/min, 5=l/h, 6=gpm, 7=cfm | |
| AVmin | 52 | Volume_UnitSel | Accumulated volume | m³, l, gal or cf (MV 126) | Read | |
| PIV | 50 | VolumePIV_UnitSel | Accumulated volume as integer (cannot be reset) | MV 126 unit | Read | |
| MV | 126 | UnitSelVolume | Engineering unit for volume objects | Write | 1=m³, 2=Litre, 3=Gallon, 4=Cubic Foot | |
| MV | 103 | StatusSensor | Flow and temperature sensor status | Read | 1=OK, 2=Flow measurement error, 3=Flowbody temperature not OK, 4=–, 5=Communication to flow sensor interrupted | |
| MV | 104 | StatusFlow | Flow status | Read | 1=OK, 2=Actual flow exceeds nominal flow, 3=–, 4=–, 5=Reverse flow | |
| MV | 105 | StatusMedia | Medium status | Read | 1=OK, 2=Glycol detected, 3=Freeze warning | |
| AVmin | 60 | GlycolConcentration | Glycol concentration | % | Read | |
| PIV | 201 | MeterSerialNo_Part1 | Flow meter serial number, first digits | Read | ||
| AImin | 23 | T_UnitSel | Flow body temperature | °C, K or °F (MV 127) | Read | |
| AI | 20 | Sens1Active_Volt | Sensor 1 input as voltage (active sensor) | V | Read | |
| BI | 20 | Sens1Switch | Sensor 1 as switch input | Read | 0=Inactive, 1=Active | |
| MV | 127 | UnitSelTemperature | Engineering unit for temperature | Write | 1=Degree C, 2=K, 3=Degree F | |
| MV | 220 | Sens1Type | Sensor 1 input type | Write | 1=None, 2=Active volt, 3=–, 4=–, 5=Switch | |
| AVmin | 140 | ErrorState | Bit-coded error and warning flags | Read | Bit 3=Reverse flow, 6=Flow actual exceeds flow nominal, 7=Flow measurement error, 9=Flowbody temperature error, 11=Freeze warning, 12=Glycol detected | |
| MVmin | 99 | SummaryStatus | Summary of MV 103-105 | Read | 1=OK, 2=Warning, 3=Not OK |
No points match these filters.
Integration notes
- The document prints access as R / W; those objects are listed here as writable (W).
- The Network Port object (instance 101) holds the MS/TP MAC address, baud rate and max master as writable properties.
- Flow, volume and temperature units follow MV 123, MV 126 and MV 127.
- Measuring range depends on pipe size (DN); see the product datasheet.
- Sensor 1 objects (AI 20, BI 20) are out of service unless MV 220 selects the matching sensor type.
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. Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the 22PF Flow Sensor 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 Belimo 22PF Flow Sensor
How many BACnet points does the Belimo 22PF Flow Sensor have?
This list has 21 BACnet objects: 2 analog inputs, 6 analog values, 1 binary input, 1 binary value, 8 multi-state values, 2 positive integer values, 1 other. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Belimo 22PF Flow Sensor BACnet points are writable?
5 of the 21 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 Belimo 22PF Flow Sensor BACnet documentation?
The source is BACnet Interface Description, Flow Sensor 22PF-.. / V4.3.0, revision 2026-07, published free by Belimo at https://www.belimo.com/mam/general-documents/system_integration/BACnet/belimo_BACnet_Interface-description_22PF_V4_3_0_en-gb.pdf.
What are the minimum BACnet points to integrate the Belimo 22PF Flow Sensor?
Start with AV 19 AbsFlow_UnitSel (Measured flow); AI 23 T_UnitSel (Water temperature at the flow body); AV 52 Volume_UnitSel (Totalized volume); AV 60 GlycolConcentration (Glycol content of the medium); MV 99 SummaryStatus (Overall OK / warning / not OK); AV 140 ErrorState (Bit-coded fault and warning flags).
Can the BMS supply sensor values to the Belimo 22PF Flow Sensor?
Sensor 1 on Y3 can be read over BACnet as a voltage (AI 20) or switch (BI 20) once MV 220 is set to that type.
How do I check these points on the real 22PF Flow Sensor?
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 Belimo BACnet points lists
- Pressure-independent control valve
Belimo 2-way EPIV V4
Belimo 2-way electronic pressure-independent valves (EPIV) version 4.2, DN 15 to 50, BACnet models EP..R2+(K)BAC.
Also known as: EPIV, EP..R2+BAC, EP..R2+KBAC, Electronic Pressure Independent Valve, 2-way EPIV DN 15-50 - 6-way pressure-independent control valve
Belimo 6-way EPIV
Belimo 6-way EPIV (EP..R-R6+BAC) used to switch and control a single coil between heating and cooling sequences.
Also known as: EP..R-R6+BAC, 6-way EPIV, 6-way characterised control valve, Belimo 6-way valve - Duct / outdoor sensors (temperature, humidity, CO2, VOC, differential pressure)
Belimo Duct and Pipe Sensors (22DTH, 22UTH, 22DTM, 22ADP) BACnet
Belimo BACnet MS/TP sensors: 22DTH duct temperature/humidity, 22UTH outdoor temperature/humidity, 22DTM duct CO2/VOC and 22ADP differential pressure/airflow sensors.
Also known as: 22DTH-..6.., 22UTH-..60X, 22DTM-..6, 22ADP-..6.., 22DTH-16M, 22DTH-56M, 22UTH-160X, 22UTH-560X, 22DTM-16, 22DTM-56, 22ADP-164, 22ADP-164L, 22ADP-56Q, 22ADP-56QB, 22ADP-564L, 22ADP-566L - Pressure-independent control valve with energy meter
Belimo Energy Valve V4
Belimo Energy Valve version 4, DN 15 to 50, BACnet models EV..R2+(K)BAC, EV..R2+MID and EV..R3+BAC.
Also known as: Energy Valve, EV..R2+BAC, EV..R2+KBAC, EV..R2+MID, EV..R3+BAC, Belimo Energy Valve 4 - Valve actuator (Ethernet, IoT)
Belimo IoT Valve Actuators VxM24A-LP1 / VxR24A-LP1 (BACnet IP)
Belimo IoT product range valve actuators VLM/VLR, VNM/VNR, VSM/VSR and VGM/VGR 24A-LP1 with Ethernet and BACnet IP.
Also known as: VLM24A-LP1, VLR24A-LP1, VNM24A-LP1, VNR24A-LP1, VSM24A-LP1, VSR24A-LP1, VGM24A-LP1, VGR24A-LP1, Belimo IoT Product Range - Butterfly valve actuator
Belimo PR..-BAC-.. Butterfly Valve Actuator (BACnet MS/TP)
Belimo PR rotary actuators for butterfly valves in the BACnet MS/TP version (PR..-BAC-..).
Also known as: PR..-BAC-.., Belimo PR actuator, PR BACnet - Room sensor / operating unit
Belimo Room Operating Unit 22RT-5U00
Belimo 22RT...-5U00... room operating units with virtual or ePaper touch display, measuring temperature, humidity and CO2.
Also known as: 22RT, 22RT…-5U00…, Room Operating Unit, ROU, 22RTM-5U00, Belimo room sensor BACnet - Thermal (BTU) energy meter
Belimo Thermal Energy Meter V4
Belimo Thermal Energy Meters version 4, DN 15 to 50 (22PE..-1U.., including MID-certified 22PEM models).
Also known as: TEM, Thermal Energy Meter, 22PE-1U, 22PEM-1UC, 22PE…-1U.., Belimo energy meter - VAV compact controller (actuator with flow sensor)
Belimo VAV-Compact
Belimo VAV-Compact volumetric flow controllers with the BACnet/Modbus interface (..MV-D3-MOD and ..HV24A-MOD).
Also known as: VAV-Compact MOD, ..MV-D3-MOD, ..HV24A-MOD, LMV-D3-MOD, NMV-D3-MOD, SMV-D3-MOD, LHV24A-MOD - VAV / CAV / pressure controller
Belimo VAV-Universal VRU
Belimo VAV-Universal controllers VRU-D3-BAC, VRU-M1-BAC and VRU-M1R-BAC used for VAV/CAV airflow, duct pressure and room pressure control.
Also known as: VAV-Universal, VRU-D3-BAC, VRU-M1-BAC, VRU-M1R-BAC, VRU-..-BAC
Source: BACnet Interface Description, Flow Sensor 22PF-.. / V4.3.0 · rev. 2026-07. Object names, instances and units are reproduced as published; descriptions are our own.