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- ESF is an airflow transducer with a wide application range.
- Linear output signal
- Converts air speed into a 4-20 mA or a 0-10V DC signal
- Fully electronic registration of airflow speed
- Compensates for air temperature changes
- Temperature output signal 0-10V
- Telescopic sensor
- Multifuse protection
- Made in non-corrosive material
- AC or DC power supply
Application
ESF is an airflow transducer with a wide application range. It may be used for control, monitoring and regulation of air flow speed in fresh air and ventilation systems etc.
- Measurement of airflow speed via PC/PLC/CTS systems
- As transducer for regulating flow speed
- Airflow monitoring via relay output (ESF-35-1).
Product Range
TypeProductEAN-Nr
ESF-35-1 Airflow transducer with built-in relay function5703502510798
ESF-35-2 Airflow transducer5703502510804
Function ESF-35-2
ESF-35-2 measures airflow speed according to the thermal principle based on the fact that the cooling effect of air increases with air speed. This cooling effect is measured and converted to a 4-20mA or 0-10V DC signal corresponding to an airflow speed from 0-8 m/s
or 0-16m/s.
At delivery the transducer is set to 0-8 m/s. If the jumper on the PCB is removed, the transducer is set to 0-16 m/s.
The µ-processor based electronic system ensures that the output signal is linear and that corrections are made if the temperature changes. If a standard analogue instrument is connected, the temperature and the airflow speed can be read remotely.
A second 0-10V DC output is provided as a measurement of the air temperature (range 0-50°C) and this can be used instead of the normal duct temperature sensor.
Function ESF-35-1
ESF-35-1 has the same functions as ESF-35-2, but in addition, ESF-35-1 has a built-in relay to provide a digital (S.P.C.O.) output. The required airspeed setpoint can be set on a potentiometer under the front cover (alarm set), and the relay will be activated whenever this airspeed is reached.
In order for the system to build up the correct duct velocity after standstill periods, the relay action can be delayed at start-up by 0-120 secs. on a second potentiometer behind the front cover.
Technical data
ESF-35-1 / 2
| AC voltage supply |
24V AC ± (120 mA)
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| DC voltage supply |
16-30V DC (80 mA)
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| Airflow speed |
0-8 m/s, 0-16 m/s |
| Output signal |
(flow)4-20 mA (RL<500Ohms) / 0-10V (max. 5 mA) |
| Output signal |
(temp.)0-10V (max. 5 mA) |
| Temperature range |
0-50°C |
| Air temperature range |
-10/+60°C |
| Ambient temperature |
-20/+50°C |
| Absolute accuracy |
±5% |
| Min. accuracy |
±0.4 m/sec. |
| Rise time |
0.5 m/sec - 16 m/sec: 20 sec. |
| Time constant |
5 sec. |
| Insertion depth on channel |
50-185 mm |
| Housing |
IP 54 |
| Dimensions H x W x D |
80 x 80 x 55 mm |
ESF-35-1
Adjustable switching setpoint for relay0.5-8 m/sec.
(0.5-16 m/s)
Alarm relay (switching function)Max. 6A / 250V AC
Time delay at relay switch-out0-120 sec.
Setting / Indication
ESF-35-1 and ESF-35-2 are set to 0-8 m/s airflow speed. If jumper SW1 is removed, see fig, the airflow speed is 0-16 m/s.
Airspeed setpoint for relay in ESF-35-1 can be set on potentiometer TP1. The delay on start-up is set on potentiometer TP2.
Red LED (ESF-35-1) lights when the relay is activated.
Mounting
ESF-35 must be mounted in such a way that the airflow passes the gap on the sensor tip.
The transducer can be mounted in air ducts with a diameter or channel width of 100-370 mm.
In order to ensure optimum operating conditions the ESF sensor tip must be placed in the middle of the duct. To avoid duct cavitations which will adversely effect the sensor, the ESF should be placed at least 6 duct diameters in front of an obstruction or bend in the ducting, and not closer than 3 duct diameters behind an obstruction.
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