Ultrasonic heat and cooling meter · BTU meter
Helvatron DELTA III
Records heating and cooling energy in separate registers, for billing and energy management in residential buildings, office towers, district cooling and industry. The battery, temperature sensors and communication card are replaceable on site.
Design
What does a DELTA III consist of?
Three components that together form a measuring instrument to EN 1434:
- Flow sensor
- Ultrasonic with metallic reflectors, self-cleaning, no moving parts. Body in brass, dezincification-resistant (DZR) brass or stainless steel. Two measuring channels from DN50, four from DN350.
- Temperature sensor pair
- Pt500, Pt1000 or Pt100 with two-wire connection, made by Jumo. One sensor is fitted in the flow sensor body, the second in the other pipe.
- Calculator
- 8-digit display, 24-month memory, communication card. In the split-type version it can be mounted separately on a DIN rail or wall. The housing can be sealed.
In the heating circuit
How does the DELTA III determine thermal energy?
It multiplies the volume that has passed through by the temperature difference between flow and return and by the heat coefficient of water. If the return is warmer than the flow, as in a chilled-water plant, it records cooling energy in a separate register.
- Heating circuitThe flow pipe carries warm water to the consumer and the return pipe brings the cooled water back. The pump keeps the water circulating.
- Install the DELTA IIIThe flow sensor is installed in the pipe, with the calculator next to it on a DIN rail or wall. One temperature sensor is fitted in the sensor body.
- Two temperaturesThe second sensor measures in the other pipe. Pt500 or Pt1000, two-wire connection. The installation instructions specify which pipe is which.
- Flow by ultrasoundInside the sensor, ultrasonic pulses travel via metallic reflectors with and against the flow. From this, the calculator determines the volume flow rate.
- Temperature differenceThe calculator continuously determines the difference between flow and return temperature.
- Calculate energyVolume times temperature difference times heat coefficient gives the energy. Heating and cooling go into separate registers.
- Send valuesThe communication card passes the values on, here via RS-485 with Modbus RTU. The card can be replaced on site.
- In the higher-level systemThe building automation or energy management system displays power, energy and temperatures and handles billing.
Simplified illustration. Values are examples. Install the flow sensor and temperature sensors in accordance with the DELTA III installation instructions.
Background: Thermal energy from flow rate and temperature difference
Maintenance during operation
What is replaceable on site?
The DELTA III is built for long service in plants that cannot be shut down.
Battery
3.6 V, 8500 mAh as standard. Service life 11 to 20 years, depending on the reading method.
Temperature sensors
Two-wire sensors with 1.5 m cable (3 m from DN50), up to 15 m on request.
Communication card
M-Bus, RS-485 or LoRa. The interface can be changed later.
Battery life by reading method (8500 mAh, 25 °C)
| M-Bus reading every 15 minutes | 18 + 1 years |
|---|---|
| M-Bus reading every 12 hours | 19 + 1 years |
| LoRa transmission every 24 hours | 10 + 1 years |
| LoRa transmission every 48 hours | 11 + 1 years |
Choose the nominal size
Which values apply to your nominal size?
DN15 to DN40 threaded (G 3/4 B to G 2 B), flanged from DN50. No straight inlet or outlet sections are required from DN15 to DN40.
Threaded connection
Flanged connection
Helvatron DELTA III DN15 Threaded connection
- Connection
- Thread G 3/4 B
- Length
- 110 mm
- Nominal flow rate qp
- 1.5 m³/h
- Maximum flow rate qs
- 3 m³/h
- Minimum flow rate qi
- 0.015 m³/h
- Pressure loss at qp
- 180 mbar
- Interfaces with part number
- M-Bus
BAAC.10C.ABM
RS-485 (Modbus RTU)BAAC.10C.ABMO
LoRaBAAC.10C.ABL
NB-IoTBAAC.10C.ABN
Helvatron DELTA III DN20 Threaded connection
- Connection
- Thread G 1 B
- Length
- 130 mm
- Nominal flow rate qp
- 2.5 m³/h
- Maximum flow rate qs
- 5 m³/h
- Minimum flow rate qi
- 0.025 m³/h
- Pressure loss at qp
- 140 mbar
- Interfaces with part number
- M-Bus
BABE.10C.ABM
RS-485 (Modbus RTU)BABE.10C.ABMO
LoRaBABE.10C.ABL
NB-IoTBABE.10C.ABN
Helvatron DELTA III DN25 Threaded connection
- Connection
- Thread G 1 1/4 B
- Length
- 260 mm
- Nominal flow rate qp
- 3.5 m³/h
- Maximum flow rate qs
- 7 m³/h
- Minimum flow rate qi
- 0.035 m³/h
- Pressure loss at qp
- 120 mbar
- Interfaces with part number
- M-Bus
BACF.10C.ABM
RS-485 (Modbus RTU)BACF.10C.ABMO
LoRaBACF.10C.ABL
NB-IoTBACF.10C.ABN
Helvatron DELTA III DN32 Threaded connection
- Connection
- Thread G 1 1/2 B
- Length
- 260 mm
- Nominal flow rate qp
- 6 m³/h
- Maximum flow rate qs
- 12 m³/h
- Minimum flow rate qi
- 0.06 m³/h
- Pressure loss at qp
- 110 mbar
- Interfaces with part number
- M-Bus
BADH.10C.ABM
RS-485 (Modbus RTU)BADH.10C.ABMO
LoRaBADH.10C.ABL
NB-IoTBADH.10C.ABN
Helvatron DELTA III DN40 Threaded connection
- Connection
- Thread G 2 B
- Length
- 300 mm
- Nominal flow rate qp
- 10 m³/h
- Maximum flow rate qs
- 20 m³/h
- Minimum flow rate qi
- 0.1 m³/h
- Pressure loss at qp
- 140 mbar
- Interfaces with part number
- M-Bus
BAEJ.10C.ABM
RS-485 (Modbus RTU)BAEJ.10C.ABMO
LoRaBAEJ.10C.ABL
NB-IoTBAEJ.10C.ABN
Helvatron DELTA III DN50 Flanged connection
- Connection
- Flange DN50
- Length
- 200 mm
- Nominal flow rate qp
- 15 m³/h
- Maximum flow rate qs
- 30 m³/h
- Minimum flow rate qi
- 0.15 m³/h
- Pressure loss at qp
- 4 kPa
- Ultrasonic channels
- 2
- Bolts
- 4 × M16, Ø 18 mm
- Weight
- 10 kg
- Interfaces with part number
- M-Bus
BAFFK.10C.ABM
RS-485 (Modbus RTU)BAFFK.10C.ABMO
LoRaBAFFK.10C.ABL
4–20 mABAFFK.10C.ABA
NB-IoTBAFFK.10C.ABN
Helvatron DELTA III DN65 Flanged connection
- Connection
- Flange DN65
- Length
- 200 mm
- Nominal flow rate qp
- 25 m³/h
- Maximum flow rate qs
- 50 m³/h
- Minimum flow rate qi
- 0.25 m³/h
- Pressure loss at qp
- 6 kPa
- Ultrasonic channels
- 2
- Bolts
- 4 × M16, Ø 18 mm
- Weight
- 10 kg
- Interfaces with part number
- M-Bus
BAGFM.10C.ABM
RS-485 (Modbus RTU)BAGFM.10C.ABMO
LoRaBAGFM.10C.ABL
4–20 mABAGFM.10C.ABA
NB-IoTBAGFM.10C.ABN
Helvatron DELTA III DN80 Flanged connection
- Connection
- Flange DN80
- Length
- 225 mm
- Nominal flow rate qp
- 40 m³/h
- Maximum flow rate qs
- 80 m³/h
- Minimum flow rate qi
- 0.4 m³/h
- Pressure loss at qp
- 9 kPa
- Ultrasonic channels
- 2
- Bolts
- 8 × M16, Ø 18 mm
- Weight
- 15 kg
- Interfaces with part number
- M-Bus
BAHFN.10C.ABM
RS-485 (Modbus RTU)BAHFN.10C.ABMO
LoRaBAHFN.10C.ABL
4–20 mABAHFN.10C.ABA
NB-IoTBAHFN.10C.ABN
Helvatron DELTA III DN100 Flanged connection
- Connection
- Flange DN100
- Length
- 250 mm
- Nominal flow rate qp
- 60 m³/h
- Maximum flow rate qs
- 120 m³/h
- Minimum flow rate qi
- 0.6 m³/h
- Pressure loss at qp
- 11 kPa
- Ultrasonic channels
- 2
- Bolts
- 8 × M16, Ø 18 mm
- Weight
- 18 kg
- Interfaces with part number
- M-Bus
BAIFO.10C.ABM
RS-485 (Modbus RTU)BAIFO.10C.ABMO
LoRaBAIFO.10C.ABL
4–20 mABAIFO.10C.ABA
NB-IoTBAIFO.10C.ABN
Helvatron DELTA III DN125 Flanged connection
- Connection
- Flange DN125
- Length
- 350 mm
- Nominal flow rate qp
- 100 m³/h
- Maximum flow rate qs
- 200 m³/h
- Minimum flow rate qi
- 1 m³/h
- Pressure loss at qp
- 7 kPa
- Ultrasonic channels
- 2
- Bolts
- 8 × M16, Ø 18 mm
- Weight
- 20 kg
- Interfaces with part number
- M-Bus
BAJFP.10C.ABM
RS-485 (Modbus RTU)BAJFP.10C.ABMO
4–20 mABAJFP.10C.ABA
NB-IoTBAJFP.10C.ABN
Helvatron DELTA III DN150 Flanged connection
- Connection
- Flange DN150
- Length
- 350 mm
- Nominal flow rate qp
- 150 m³/h
- Maximum flow rate qs
- 300 m³/h
- Minimum flow rate qi
- 1.5 m³/h
- Pressure loss at qp
- 6 kPa
- Ultrasonic channels
- 2
- Bolts
- 8 × M20, Ø 22 mm
- Weight
- 20 kg
- Interfaces with part number
- M-Bus
BAKFQ.10C.ABM
RS-485 (Modbus RTU)BAKFQ.10C.ABMO
4–20 mABAKFQ.10C.ABA
NB-IoTBAKFQ.10C.ABN
Helvatron DELTA III DN200 Flanged connection
- Connection
- Flange DN200
- Length
- 350 mm
- Nominal flow rate qp
- 250 m³/h
- Maximum flow rate qs
- 500 m³/h
- Minimum flow rate qi
- 2.5 m³/h
- Pressure loss at qp
- 4 kPa
- Ultrasonic channels
- 2
- Bolts
- 12 × M20, Ø 22 mm
- Weight
- 28 kg
- Interfaces with part number
- M-Bus
BALFS.10C.ABM
RS-485 (Modbus RTU)BALFS.10C.ABMO
4–20 mABALFS.10C.ABA
NB-IoTBALFS.10C.ABN
Helvatron DELTA III DN250 Flanged connection
- Connection
- Flange DN250
- Length
- 400 mm
- Nominal flow rate qp
- 400 m³/h
- Maximum flow rate qs
- 800 m³/h
- Minimum flow rate qi
- 4 m³/h
- Pressure loss at qp
- 4 kPa
- Ultrasonic channels
- 2
- Bolts
- 12 × M24, Ø 26 mm
- Weight
- 30 kg
- Interfaces with part number
- M-Bus
BAMFU.10C.ABM
RS-485 (Modbus RTU)BAMFU.10C.ABMO
4–20 mABAMFU.10C.ABA
NB-IoTBAMFU.10C.ABN
Helvatron DELTA III DN300 Flanged connection
- Connection
- Flange DN300
- Length
- 450 mm
- Nominal flow rate qp
- 600 m³/h
- Maximum flow rate qs
- 1200 m³/h
- Minimum flow rate qi
- 6 m³/h
- Pressure loss at qp
- 4 kPa
- Ultrasonic channels
- 2
- Bolts
- 12 × M24, Ø 26 mm
- Weight
- 50 kg
- Interfaces with part number
- M-Bus
BANFV.10C.ABM
RS-485 (Modbus RTU)BANFV.10C.ABMO
NB-IoTBANFV.10C.ABN
Helvatron DELTA III DN350 Flanged connection
- Connection
- Flange DN350
- Length
- 500 mm
- Nominal flow rate qp
- 800 m³/h
- Maximum flow rate qs
- 1600 m³/h
- Minimum flow rate qi
- –
- Pressure loss at qp
- 2 kPa
- Ultrasonic channels
- 4
- Bolts
- 16 × M24, Ø 26 mm
- Weight
- 80 kg
- Interfaces with part number
- M-Bus
BAOFW.10C.ABM
RS-485 (Modbus RTU)BAOFW.10C.ABMO
NB-IoTBAOFW.10C.ABN
Helvatron DELTA III DN400 Flanged connection
- Connection
- Flange DN400
- Length
- 550 mm
- Nominal flow rate qp
- 1000 m³/h
- Maximum flow rate qs
- 2000 m³/h
- Minimum flow rate qi
- –
- Pressure loss at qp
- 2 kPa
- Ultrasonic channels
- 4
- Bolts
- 16 × M27, Ø 30 mm
- Weight
- 140 kg
- Interfaces with part number
- M-Bus
BAPF0.10C.ABM
RS-485 (Modbus RTU)BAPF0.10C.ABMO
NB-IoTBAPF0.10C.ABN
Helvatron DELTA III DN450 Flanged connection
- Connection
- Flange DN450
- Length
- 600 mm
- Nominal flow rate qp
- 1300 m³/h
- Maximum flow rate qs
- 2600 m³/h
- Minimum flow rate qi
- –
- Pressure loss at qp
- 2 kPa
- Ultrasonic channels
- 4
- Bolts
- 20 × M27, Ø 30 mm
- Weight
- 160 kg
- Interfaces with part number
- M-Bus
BAQF0.10C.ABM
RS-485 (Modbus RTU)BAQF0.10C.ABMO
NB-IoTBAQF0.10C.ABN
Helvatron DELTA III DN500 Flanged connection
- Connection
- Flange DN500
- Length
- 650 mm
- Nominal flow rate qp
- 1600 m³/h
- Maximum flow rate qs
- 3200 m³/h
- Minimum flow rate qi
- –
- Pressure loss at qp
- 2 kPa
- Ultrasonic channels
- 4
- Bolts
- 20 × M30, Ø 33 mm
- Weight
- 180 kg
- Interfaces with part number
- M-Bus
BARF0.10C.ABM
RS-485 (Modbus RTU)BARF0.10C.ABMO
NB-IoTBARF0.10C.ABN
Helvatron DELTA III DN600 Flanged connection
- Connection
- Flange DN600
- Length
- 800 mm
- Nominal flow rate qp
- 2300 m³/h
- Maximum flow rate qs
- 4600 m³/h
- Minimum flow rate qi
- –
- Pressure loss at qp
- 2 kPa
- Ultrasonic channels
- 4
- Bolts
- 20 × M33, Ø 36 mm
- Weight
- 202 kg
- Interfaces with part number
- M-Bus
BASF0.10C.ABM
RS-485 (Modbus RTU)BASF0.10C.ABMO
NB-IoTBASF0.10C.ABN
Helvatron DELTA III DN700 Flanged connection
- Connection
- Flange DN700
- Length
- 875 mm
- Nominal flow rate qp
- 3000 m³/h
- Maximum flow rate qs
- 6000 m³/h
- Minimum flow rate qi
- –
- Pressure loss at qp
- 2 kPa
- Ultrasonic channels
- 4
- Interfaces with part number
- M-Bus
BATF0.10C.ABM
NB-IoTBATF0.10C.ABN
Helvatron DELTA III DN800 Flanged connection
- Connection
- Flange DN800
- Length
- 1000 mm
- Nominal flow rate qp
- 4000 m³/h
- Maximum flow rate qs
- 8000 m³/h
- Minimum flow rate qi
- –
- Pressure loss at qp
- 2 kPa
- Ultrasonic channels
- 4
- Interfaces with part number
- M-Bus
BAUF0.10C.ABM
NB-IoTBAUF0.10C.ABN
Helvatron DELTA III DN900 Flanged connection
- Connection
- Flange DN900
- Length
- 1125 mm
- Nominal flow rate qp
- 5000 m³/h
- Maximum flow rate qs
- 10000 m³/h
- Minimum flow rate qi
- –
- Pressure loss at qp
- 2 kPa
- Ultrasonic channels
- 4
- Interfaces with part number
- M-Bus
BAVF0.10C.ABM
NB-IoTBAVF0.10C.ABN
Helvatron DELTA III DN1000 Flanged connection
- Connection
- Flange DN1000
- Length
- 1250 mm
- Nominal flow rate qp
- 6000 m³/h
- Maximum flow rate qs
- 12000 m³/h
- Minimum flow rate qi
- –
- Pressure loss at qp
- 2 kPa
- Ultrasonic channels
- 4
- Interfaces with part number
- M-Bus
BAWF0.10C.ABM
NB-IoTBAWF0.10C.ABN
The current technical documentation is binding.
All nominal sizes as a table
| Nominal size | Connection | qp | qs | qi | Δp (qp) | L |
|---|---|---|---|---|---|---|
| DN15 | G 3/4 B | 1.5 | 3 | 0.015 | 180 mbar | 110 mm |
| DN20 | G 1 B | 2.5 | 5 | 0.025 | 140 mbar | 130 mm |
| DN25 | G 1 1/4 B | 3.5 | 7 | 0.035 | 120 mbar | 260 mm |
| DN32 | G 1 1/2 B | 6 | 12 | 0.06 | 110 mbar | 260 mm |
| DN40 | G 2 B | 10 | 20 | 0.1 | 140 mbar | 300 mm |
| DN50 | DN50 | 15 | 30 | 0.15 | 4 kPa | 200 mm |
| DN65 | DN65 | 25 | 50 | 0.25 | 6 kPa | 200 mm |
| DN80 | DN80 | 40 | 80 | 0.4 | 9 kPa | 225 mm |
| DN100 | DN100 | 60 | 120 | 0.6 | 11 kPa | 250 mm |
| DN125 | DN125 | 100 | 200 | 1 | 7 kPa | 350 mm |
| DN150 | DN150 | 150 | 300 | 1.5 | 6 kPa | 350 mm |
| DN200 | DN200 | 250 | 500 | 2.5 | 4 kPa | 350 mm |
| DN250 | DN250 | 400 | 800 | 4 | 4 kPa | 400 mm |
| DN300 | DN300 | 600 | 1200 | 6 | 4 kPa | 450 mm |
| DN350 | DN350 | 800 | 1600 | – | 2 kPa | 500 mm |
| DN400 | DN400 | 1000 | 2000 | – | 2 kPa | 550 mm |
| DN450 | DN450 | 1300 | 2600 | – | 2 kPa | 600 mm |
| DN500 | DN500 | 1600 | 3200 | – | 2 kPa | 650 mm |
| DN600 | DN600 | 2300 | 4600 | – | 2 kPa | 800 mm |
| DN700 | DN700 | 3000 | 6000 | – | 2 kPa | 875 mm |
| DN800 | DN800 | 4000 | 8000 | – | 2 kPa | 1000 mm |
| DN900 | DN900 | 5000 | 10000 | – | 2 kPa | 1125 mm |
| DN1000 | DN1000 | 6000 | 12000 | – | 2 kPa | 1250 mm |
qp, qs, qi in m³/h. The current technical documentation is binding.
Even larger: DELTA III MAG
For very large pipe sizes, the DELTA III MAG is available: an electromagnetic flow sensor from DN100 to DN2000 with the DELTA III calculator in split-type design. The sensor requires an external power supply (230 V, optionally 24 V DC); flow velocity range 0.3 to 12 m/s.Flange data
Flanges, bolts and weights
For planning pipework and supports. D is the outer flange diameter, K the pitch circle, H the height.
| Nominal size | Ultrasonic channels | Bolts | Bolt hole diameter | Flange thickness | Flange outer diameter D | Pitch circle K | H | Weight |
|---|---|---|---|---|---|---|---|---|
| DN50 | 2 | 4 × M16 | 18 mm | 20 mm | 165 mm | 125 mm | 245 mm | 10 kg |
| DN65 | 2 | 4 × M16 | 18 mm | 20 mm | 185 mm | 145 mm | 255 mm | 10 kg |
| DN80 | 2 | 8 × M16 | 18 mm | 20 mm | 200 mm | 160 mm | 280 mm | 15 kg |
| DN100 | 2 | 8 × M16 | 18 mm | 22 mm | 220 mm | 180 mm | 295 mm | 18 kg |
| DN125 | 2 | 8 × M16 | 18 mm | 24 mm | 250 mm | 210 mm | 385 mm | 20 kg |
| DN150 | 2 | 8 × M20 | 22 mm | 24 mm | 285 mm | 240 mm | 415 mm | 20 kg |
| DN200 | 2 | 12 × M20 | 22 mm | 26 mm | 340 mm | 295 mm | 475 mm | 28 kg |
| DN250 | 2 | 12 × M24 | 26 mm | 29 mm | 405 mm | 355 mm | 535 mm | 30 kg |
| DN300 | 2 | 12 × M24 | 26 mm | 32 mm | 460 mm | 410 mm | 590 mm | 50 kg |
| DN350 | 4 | 16 × M24 | 26 mm | 35 mm | – | – | – | 80 kg |
| DN400 | 4 | 16 × M27 | 30 mm | 38 mm | – | – | – | 140 kg |
| DN450 | 4 | 20 × M27 | 30 mm | 42 mm | – | – | – | 160 kg |
| DN500 | 4 | 20 × M30 | 33 mm | 46 mm | – | – | – | 180 kg |
| DN600 | 4 | 20 × M33 | 36 mm | 55 mm | – | – | – | 202 kg |
Communication
Two communication paths in one meter
The DELTA III has two communication ports. Combinations such as M-Bus plus RS-485 or M-Bus plus LoRa can be ordered as separate versions.
- M-Bus
- wired; can be powered via the M-Bus with backup battery
- Wireless M-Bus, 868 MHz
- total energy, flow rate, date and time, billing date, error code
- RS-485 · Modbus RTU
- direct connection to building automation and gateways
- LoRa, 868 MHz
- radio for widely spread metering points
- NB-IoT
- via the mobile network in all nominal sizes, without a radio network of your own. More
- 4–20 mA, option
- analogue output for the flow rate, plus a pulse input
Values in the calculator
- Heating energy and cooling energy in separate registers
- Volume
- Instantaneous power
- Instantaneous flow rate
- Flow temperature
- Return temperature
- Temperature difference
- Operating time and alarm time
- Error code
- Pulse input
Alarms
- Incorrect flow direction
- Negative temperature difference
- Sensor open circuit
- Sensor short circuit
- Air in pipe
- Low battery
Technical data
Helvatron DELTA III at a glance
- Nominal sizes
- DN15–DN1000 · Threaded DN15–DN40, flanged from DN50
- Approvals and standards
- MID, type examination PTB: DE-23-MI004-PTB007 · MID module D, METAS-Cert: 6030-03039 (notified body 1259) · EN 1434 · CE
- Dynamic range
- qp/qi R100, option R50 or R250
- Medium temperature
- 0.1 … 130 °C; 4 … 95 °C on request
- Ambient temperature
- +5 °C … +65 °C
- Environmental class
- Class C / EN 1434-1
- Ingress protection
- Calculator IP65, flow sensor IP68
- Nominal pressure
- PN16 / PN25
- Flow sensor
- Ultrasonic with metallic reflectors, self-cleaning, no moving parts. Flanged DN50–DN300: 2 ultrasonic channels, from DN350: 4 channels
- Sensor body
- Brass, DZR brass or stainless steel
- Temperature sensors
- Pt500, Pt1000 or Pt100, two-wire connection; cable 1.5 m (from DN50 3.0 m), up to 15 m on request
- Flow sensor cable
- Flow sensor cable 1.5 / 2.5 / 5 / 10 / 15 m, longer on request
- Units
- kWh, MWh, GJ, Gcal, m³
- Memory
- 24 months (daily and monthly values), archive 730 days
- Calculator mounting
- Calculator on DIN rail or with wall adapter (included); split type: calculator can be mounted separately
- Display
- 8-digit LCD, programmable display
- Power supply
- 3.6 V battery, replaceable, 11 to 20 years (standard 8500 mAh). Option: 24 V DC or power via M-Bus with backup battery
- Interfaces
- M-Bus · Wireless M-Bus 868 MHz · RS-485 (Modbus RTU) · LoRa 868 MHz · NB-IoT · 4–20 mA (flow rate, option) · Pulse input (option) · Optical interface
The current technical documentation is binding.
MID type examinationPhysikalisch-Technische Bundesanstalt (PTB)
DE-23-MI004-PTB007MID module DQuality assurance of production, METAS-Cert
6030-03039 · notified body 1259EN 1434Heat meters; compliance
Choice of sensors
Why do we recommend Pt1000 sensors?
Pt500 and Pt1000 are platinum resistance thermometers. The Pt1000 has a resistance of 1000 Ω at 0 °C, twice that of the Pt500. The resistance of the connecting cable therefore matters less, and the sensor is more linear over a wide temperature range. Pt1000 sensors are also widely available and easy to replace.
Part numbers
Part numbers by nominal size and interface
The suffix identifies the interface: ABM M-Bus, ABMO RS-485 Modbus RTU, ABL LoRa, ABN NB-IoT, ABA 4–20 mA, ABMM M-Bus and RS-485, ABML M-Bus and LoRa. All versions up to DN1000 are available.
| Nominal size | M-Bus | RS-485 (Modbus RTU) | LoRa | 4–20 mA | NB-IoT |
|---|---|---|---|---|---|
| DN15 | BAAC.10C.ABM | BAAC.10C.ABMO | BAAC.10C.ABL | No part number with this interface. | BAAC.10C.ABN |
| DN20 | BABE.10C.ABM | BABE.10C.ABMO | BABE.10C.ABL | No part number with this interface. | BABE.10C.ABN |
| DN25 | BACF.10C.ABM | BACF.10C.ABMO | BACF.10C.ABL | No part number with this interface. | BACF.10C.ABN |
| DN32 | BADH.10C.ABM | BADH.10C.ABMO | BADH.10C.ABL | No part number with this interface. | BADH.10C.ABN |
| DN40 | BAEJ.10C.ABM | BAEJ.10C.ABMO | BAEJ.10C.ABL | No part number with this interface. | BAEJ.10C.ABN |
| DN50 | BAFFK.10C.ABM | BAFFK.10C.ABMO | BAFFK.10C.ABL | BAFFK.10C.ABA | BAFFK.10C.ABN |
| DN65 | BAGFM.10C.ABM | BAGFM.10C.ABMO | BAGFM.10C.ABL | BAGFM.10C.ABA | BAGFM.10C.ABN |
| DN80 | BAHFN.10C.ABM | BAHFN.10C.ABMO | BAHFN.10C.ABL | BAHFN.10C.ABA | BAHFN.10C.ABN |
| DN100 | BAIFO.10C.ABM | BAIFO.10C.ABMO | BAIFO.10C.ABL | BAIFO.10C.ABA | BAIFO.10C.ABN |
| DN125 | BAJFP.10C.ABM | BAJFP.10C.ABMO | No part number with this interface. | BAJFP.10C.ABA | BAJFP.10C.ABN |
| DN150 | BAKFQ.10C.ABM | BAKFQ.10C.ABMO | No part number with this interface. | BAKFQ.10C.ABA | BAKFQ.10C.ABN |
| DN200 | BALFS.10C.ABM | BALFS.10C.ABMO | No part number with this interface. | BALFS.10C.ABA | BALFS.10C.ABN |
| DN250 | BAMFU.10C.ABM | BAMFU.10C.ABMO | No part number with this interface. | BAMFU.10C.ABA | BAMFU.10C.ABN |
| DN300 | BANFV.10C.ABM | BANFV.10C.ABMO | No part number with this interface. | No part number with this interface. | BANFV.10C.ABN |
| DN350 | BAOFW.10C.ABM | BAOFW.10C.ABMO | No part number with this interface. | No part number with this interface. | BAOFW.10C.ABN |
| DN400 | BAPF0.10C.ABM | BAPF0.10C.ABMO | No part number with this interface. | No part number with this interface. | BAPF0.10C.ABN |
| DN450 | BAQF0.10C.ABM | BAQF0.10C.ABMO | No part number with this interface. | No part number with this interface. | BAQF0.10C.ABN |
| DN500 | BARF0.10C.ABM | BARF0.10C.ABMO | No part number with this interface. | No part number with this interface. | BARF0.10C.ABN |
| DN600 | BASF0.10C.ABM | BASF0.10C.ABMO | No part number with this interface. | No part number with this interface. | BASF0.10C.ABN |
| DN700 | BATF0.10C.ABM | No part number with this interface. | No part number with this interface. | No part number with this interface. | BATF0.10C.ABN |
| DN800 | BAUF0.10C.ABM | No part number with this interface. | No part number with this interface. | No part number with this interface. | BAUF0.10C.ABN |
| DN900 | BAVF0.10C.ABM | No part number with this interface. | No part number with this interface. | No part number with this interface. | BAVF0.10C.ABN |
| DN1000 | BAWF0.10C.ABM | No part number with this interface. | No part number with this interface. | No part number with this interface. | BAWF0.10C.ABN |
Questions
Frequently asked questions about the DELTA III
Does the DELTA III measure heating and cooling?
Yes. It keeps separate registers for heating energy and cooling energy, which makes it suitable for plants that both heat and cool during the year, and for district cooling.
Which nominal sizes are available?
Ultrasonic from DN15 to DN1000: DN15 to DN40 threaded, flanged from DN50. For DN100 to DN2000, the electromagnetic DELTA III MAG is also available.
Which approvals does the DELTA III have?
MID type examination by PTB (DE-23-MI004-PTB007) and MID module D by METAS-Cert (6030-03039, notified body 1259). It complies with EN 1434 and carries the CE mark.
Can I change the interface later?
Yes. The communication interface is on a card that can be replaced on site, for example to switch from M-Bus to LoRa.
Which units does the DELTA III display?
kWh, MWh, GJ, Gcal and m³. The displayed values are programmable.
How long does the battery last?
11 to 20 years. With M-Bus reading every 12 hours it is 19 + 1 years, with LoRa transmission every 24 hours 10 + 1 years.
A project with the DELTA III?
For boiler rooms, chilled-water plants and district cooling, we can advise you on nominal size, sensors and interface. Projects in the Middle East are handled by our team in Dubai.