General description, Power supply options, Measured parameters – ROTRONIC HF5 User Manual

Page 6: Calculated parameters, E-m-hf5-v2_12, 3general description, 1 power supply options, 2 measured parameters, 3 calculated parameters

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E-M-HF5-V2_12

Rotronic AG
Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF5 Humidity Temperature
Transmitters: User Guide

Instruction Manual

Document Type

Page

6 of 36

Document title

© 2009-2013; Rotronic AG E-M-HF5-V2_12

3

General description

3.1 Power supply options

Depending on the circuit type, the HF5 requires the following power supply:

a) HF52 (2-

wire loop powered, analog outputs): 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 ohms.

For the maximum load of 500 , the minimum supply voltage is 10 + (0.02 x 500) = 20 VDC. With both
output circuits closed, the maximum current consumption is 40 mA.

b) HF53, HF54 and HF56 (3-wire, analog outputs optionally combined with a digital output):


- HF53: 15 to 40 VDC or 12 to 28 VAC
- HF54: 9 to 36 VDC or 7 to 24 VAC, galvanic isolation of the analog outputs and power supply
- HF56

: 85…240 VAC, galvanic isolation of the analog outputs and power supply


HF53 and HF54: with both output circuits closed, the typical current consumption is 100 mA.
HF56: typical current consumption <50 mA at 85 VAC and <35 mA at 240 VAC

Please verify the product identification label to determine which power supply option is installed on your
transmitter.


c) HF556, HF557 and HF566 (digital output only):


- HF556: 5 to 40 VDC or 12 to 28 VAC
- HF557: PoE (power over Ethernet).The HF557 is not available with a RS-485 interface and can be
powered only via a LAN.
- HF566

: 85…240 VAC


Typical current consumption

HF556 with USB interface

: 100 mA

HF556 with Ethernet (TCP/IP) interface and HF557 : 300 mA
HF566 USB interface

: <50 mA at 85 VAC and <35 mA at 240 VAC

HF566 with Ethernet (TCP/IP) interface

: <50 mA at 85 VAC and <35 mA at 240 VAC


3.2 Measured parameters

The HygroClip 2 probe used with the HF5 transmitter measures relative humidity with a ROTRONIC
Hygromer

®

IN1 capacitive sensor and temperature with a Pt100 RTD.

3.3 Calculated parameters

Using the ROTRONIC HW4 software, the HF5 can be configured by the user to calculate one of the following
parameters:

o

Dew point (Dp) above and below freezing

o

Frost point (Fp) below freezing and dew point above freezing

o

Wet bulb temperature (Tw)

o

Enthalpy (H)

o

Vapor concentration (Dv)

o

Specific humidity (Q)

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