The HF1 series offers the following user functions:
• User configurable settings
• 1-point humidity adjustment
Variants
Two types of electronic circuit are available: HF120: 2-wire, loop powered (4…20 mA current signal) and HF13x: 3-wire (voltage or current signal). Both circuit types provide linear analog outputs signals for transmission over a length of cable to a remote display, recorder, controller or data processing unit. The HF1 transmitters can be used to measure humidity only, temperature only or both parameters.
Wire |
Mount type |
Output |
Display |
|
HF120 |
2-Wire |
W/D/F/S |
4...20mA |
W/D/F/S |
HF132 |
3-Wire |
W/D/F/S |
4...20mA |
W/D/F/S (With HygroSoft the backlight can be switched on/off) |
HF135 |
3-Wire |
W/D/F/S |
0...10V (With HygroSoft the range can be changed to 0-1V/5V/10V) |
W/D/F/S (With HygroSoft the backlight can be switched on/off) |
W = Wall, D = Duct 100mm probe length, F = Duct 300mm probe length, S = Space
Display option
The upper line of the display corresponds to relative humidity and the bottom line corresponds to temperature.
The display option for the HF13x has a backlight. The display option for the HF120 does not have a backlight.
Power supply
HF120 |
2-wire, loop powered |
10…28 VDC - depending on the load connected to the output(s). The minimum supply voltage can be determined as follows:
V min = 10 V + (0.02 x Load*) *Load resistance in Ω.
For the maximum load of 500 Ω, the minimum supply voltage is 10 + (0.02 x 500) = 20 VDC. With both output circuits closed, the maximum current consumption is 40 mA. |
HF33 |
3-wire, analog outputs |
15 to 40 VDC (see note below) or 12 to 28 VAC. with voltage output < 15 mA with current output < 55 mA
maximum load of 500 Ω |
Measured parameters
The HF1 measures relative humidity with a ROTRONIC Hygromer® IN-1 capacitive sensor and temperature with a Thermistor.
Analog output signals (HF120 and HF13x)
HF120 and HF13x:
The ROTRONIC HW5 or HygroSoft software allows changing the scale of the output signal to one of the following:
2-Wire: can't be changed, only 4…20mA output
3-Wire: 0…1V, 0…5V or 0…10V.
Both output signals are automatically configured with the same signal type. No calibration or adjustment is required after changing the type of output signal.
The scale of each analog output can be set within the numerical limits of -999.99 and 9999.99.
Service connector
The service connector is a mini-USB type. This allows connecting the HF1 to a PC running the ROTRONIC HW5 or HygroSoft software. In both cases a mini-USB cable is required. See “Maintenance” for the location of the service connector and for the type of service cable to be used.
•Connecting the HF1 to a PC is used to configure the HF1, gain access to the HF1 functions such as humidity and temperature adjustment, read data from the HF1 on the PC.
Sensor protection (dust filter)
The HF1 is supplied with a Polyethylene filter to protect the sensors against dust particles and high air velocity.