Duct top-hat rail airflow sensor KHSSFV-Modbus
temperature Strömung

Duct top-hat rail airflow sensor RHEASREG® KHSSFV-Modbus

Item no. 1701-5216-0302-000
EAN 4251325625461
Product group: WG01

Currently not available

359,47 €
427,77 € incl. VAT + shipping


Duct top-hat rail airflow sensor RHEASREG® KHSSFV
Electronic duct top-hat rail air flow sensor RHEASGARD® KHSSFV - Modbus with Modbus connection, housing for installation in distributions or control cabinets with 35 mm mounting rail, external flow probe incl. mounting flange, for determining the flow velocity (0.1...20 m/s). The following parameters can be queried via the Modbus:

The flow sensor is suitable for monitoring or controlling air flows in ducts, on fans, control dampers, for flow-dependent monitoring of humidifiers and electric heating registers in accordance with DIN 57100 Part 420 or for use in conjunction with DDC systems. Innovative Modbus sensor with galvanically isolated RS485 Modbus interface, switchable bus terminating resistor, DIP switch for setting the bus parameters and bus address in de-energised state, LEDs for telegram status display. The sensor is calibrated at the factory.

Technical details

LED operating status indicator
LED green [ok]
error-free protocol received

LED red [err.]
faulty protocol or checksum.
Measuring range Volume flow
0...200.000 m³/h
Voltage supply
24 V AC/ DC (± 10 %)
Data points
Flow velocity, volume flow
Start bridging
20 m/s for 60 s
(after applying the supply voltage).
Measuring accuracy
0.5 m/s + 3 % measured value
Warm up time
< 2 minutes
Response time
< 60 s
calorimetric, temperature compensated, sensor breakage protection, with manual zero point calibration (via push button).
± 1.0 % final value
Current consumption
approx. 4 VA
Measuring range
0,1...20 m/s
Measuring ranges
0,1...20 m/s
0...200.000 m³/h
Media temperature
0... 70 °C
Ambient temperature
storage –20...+ 50 °C
operation 0...+ 50 °C
pollutant-free, non-precipitating air
Bus protocol
Modbus (RTU mode),
address range 0...247 selectable
Signal filtering
0...30 values
Process connection
by mounting flange
(included in the scope of delivery)
Protective tube
Polyamide (PA6) material, white colour (blue sensor holder), with torsion protection, Ø 12 mm, EL = approx. 20–155 mm, vmax = 20 m/s (air)
Electrical connection
0.14 - 2.5 mm²
via terminal screws
Material PC / ABS (UL94-V0), colour light grey,
width 36 mm (2TE) for 35 mm mounting rail,
approx. 90 x 36 x 58 mm (HxWxD).
Screwed socket
Long-term stability
± 0.5 % final value per year
Permissible air humidity
< 98% RH, pollutant-free, non-precipitating air
Protection class
III (according to EN 60 730)
Protection type
IP 30, Sensors IP 20
Protection type (sensor)
IP 20 (according to EN 60 529)
Protection type housing
IP 30 (according to EN 60 529)
CE conformity,
according to EMC directive 2014/ 30/ EU,
according to EN 61326-1, according to EN 61326-2-3