Rotronic HygroFlex5-EX Humidity Temperature Transmitter Instruction Manual

The HygroFlex5-EX is a humidity/temperature transmitter for fixed installation mounting in applications that require high measurement accuracy. The transmitters are compatible with all Rotronic ATEX sensors from the AirChip 3000 series. Standard sensors must not be used. The op-erating temperature range of the electronics is limited to -40…60 °C (-10…60 °C with optional LCD display).

Further information can be found at ProcessSensing.com or rotronic.com, or scan the QR code to access the Rotronic online manual with further explanations.

COMMISSIONING

HygroFlex5-EX (2-wire circuit, loop-powered): 10…28 VDC depending on the depending on the loads connected to the outputs. The minimum supply voltage can be determined as follows: V min = 10 V + (0.02 A x load*) *load resistance in ohms. For the maximum load of 500 Ω, the minimum supply voltage is 10 V + (0.02 A x 500 Ω ) = 20 VDC. If both output circuits are closed, the maximum current consumption is consumption is 40 mA during operation. The device must be correctly closed during operation to ensure explosion protection.

GROUNDING

STARTING THE DEVICE

The device needs approx. 1 minute for the entire start-up process. After approx. 20 seconds, “Please wait” appears on the display. During this time, both analog signals increase to approx. 21 mA. The device then starts operation and the analogue outputs are set to the corresponding measured value after the first measuring interval.

SERVICE CONNECTOR

The service connector (UART interface with a mini-USB connector) ena-bles the HygroFlex5-EX to be connected to a PC running the Rotronic Hy-groSoft software. A service cable is required. See chapter “Maintenance” for the location of the service connector and the type of service cable.

WARNING:

The service interface is a UART interface with a mini-USB connector. Do not connect the service interface directly to a USB port, but only via service cable AC3006!
The service interface is located inside the device. To access it, the device cover must be removed after loosening the 4 screws. The device must not be located in an explosive zone during service work!

ELECTRICAL SCHEME

VERDRAHTUNG

According to EN60079-14 in accordance with ATEX, no SELV device is required for the power supply (SELV supply = with limited transients). The measuring transducer can also be operated with only one closed measuring loop.

Connection terminals
Permitted conductor cross-section (rigid)	Permitted conductor cross-section (flexible)	Stripping length
0.2 mm²…4 mm²	0.2 mm²…2.5 mm²	10 mm

Clamps	Description
K1: CH1-	Relative humidity output 1 (4…20 mA)
K1: CH1+	Power supply: 10…28 VDC
K2: CH2-	Temperature output 2 (4…20 mA)
K2: CH2+	Power supply: 10…28 VDC

Cable gland

Clamping range

4.5 – 10 mm (nicht armiertes Kabel)

Tightening torque

10 Nm

PERIODIC CHECK (CALIBRATION) OF THE SENSOR

The PT-100 RTD temperature sensor used in the probe and the electronics are very stable over the long term and generally require no further calibration after the initial factory adjustment. The long-term stability of the hygrometer humidity sensor from Rotronic is generally better than 1%rh per year. For maximum accuracy, the calibration of the sensor should be checked every 6 to 12 months. Applications where the sensor is exposed to significant contamination may require more frequent checks.

Note: The HygroClip 2 sensor cannot be adjusted when connected to the HygroFlex5-EX transmitter.

REPAIR

Do not repair defective appliances yourself. The appliance must be sent to the manufacturer’s service center for repair.

REPLACEMENT FILTER

Steel sintered filter: SP-FN15

POWER SUPPLY

There are two separate connections for the humidity and temperature sensors. The measuring device connections include the power supply and sensor signal. The supply voltages of the two sensors may be different because they are decoupled via two internal diodes. The device can also be operated with only one loop.

Device input voltage

USupply = 20 V…28VDC [24 V +/- 15%]

Maximum Power

ISupply max.= 50 mA [sum of both input currents]

Resistance

RM = 0…500 Ω [measuring voltage 0V…10V]

Ambient temperature range

Measuring sensor: TA = [- 40 °C…+ 85 °C]

Transmitter with LCD: TA = [- 10 °C…+ 60 °C]
Transmitter without LCD: TA = [- 40 °C…+ 60 °C]

The usual ATEX standards only apply for normal temperature [-20 °C…+40 °C] and for a pressure range of [0.8 bar…1.1 bar]. The extended temperature range must be noted on the rating plate.

INPUT PROTECTION CIRCUIT

The device is protected against reverse polarity by two diodes. In addition, two Z-transit diodes protect against static and transient overvoltages. These measures are not required by ATEX. However, they have been implemented as supplementary protective measures that are easy to realise.

UM = 28 V DC

Supply circuit sensor

Maximum output voltage: UO ≤ 6.6 V
Maximum output current: IO ≤ 82 mA
Maximum output power: PO ≤ 485 mW
Capacity: CO = 22 μF
Inductance: Lo = 2 μH
HC2-LDPxxx-EX

Sensor circuit

Maximum input voltage: UI ≤ 6.6 V
Maximum input current: II ≤ 82 mA
Maximum input power: PI ≤ 485 mW
Internal capacitance: CI = 19 μF

Internal inductance: LI = 0
All other sensors

Sensor circuit

Maximum input voltage: UI ≤ 6.6 V
Maximum input current: II ≤ 82 mA
Maximum input power: PI ≤ 485 mW

Internal capacitance: CI = 15 μF
Internal inductance: LI = 0

Type of ignition protection intrinsic safety Ex ia IIC.

ATEX-DATA

Measuring probe	For operating temperature Tamb = [-40…+60 °C]
II 1/2 G Ex ia IIC T5 Ga/Gb	Zone 0, gas, intrinsically safe, temp. 100°C
II 1/2 D Ex ia IIIC T80°C Da/Db	Zone 20, dust, intrinsically safe, Temp. 80°C
IP66	IP protection 66
or	For operating temperature Tamb = [-40…+85 °C]
II 1/2 G Ex ia IIC T4 Ga/Gb	Zone 0, gas, intrinsically safe, temp. 130 °C
II 1/2 D Ex ia IIIC T110°C Da/Db	Zone 20, dust, intrinsically safe, Temp. 110 °C
IP66	IP protection 66
(1/2 – 1: Zone 0 and 2: Zone 1 suitable for installation in zone partition wall) (Ga – very high protection level (zone 0), Gb – high protection level (zone 1)) (Da – very high protection level (zone 0), Db – high protection level (zone 1)) (Ga/Gb, Da/Db suitable for installation in zone partition wall)

Transmitter	For operating temperature Tamb = [-40…+60 °C] (without LCD display) For operating temperature Tamb = [-10…+60 °C] (with LCD display)
II 2(1) G Ex eb mb [ia Ga] IIC T5 Gb	Zone 1, 2, gas, (intrinsically safe), Temp. 100 °C
II 2(1) D Ex tb [ia Da] IIIC T80°C Db	Zone 21, 22, dust, (intrinsically safe), Temp. 80 °C
IP66	IP protection 66
(2(1) – 2: Zone 1, (1): contains circuits that may be routed in Zone 0) (Ex e mb [ia Ga] several types of protection: Ex-e, Ex-mb and output Ex-ia)

Complete system

II 1/2 G Ex eb ia mb IIC T5 Ga/Gb

II 1/2 D Ex ia tb IIIC T80°C Da/Db

NAMEPLATE INFORMATION

Manufacturer Company	Rotronic AG, CH-8303 Bassersdorf
Type Description	HF520-EX
Series number	< Number >
Measurement probe	II 1/2 G Ex ia IIC T5…T4 Ga/Gb II 1/2 G Ex ia IIC T5…T4 Ga/Gb, IP66
Measuring transmitter	II 2(1) G Ex eb mb [ia Ga] IIC T5 Gb II 2(1) D Ex tb [ia Da] IIIC T80 °C Db IP66
Certification organization	Eurofins, Fehraltorf (CH)
Certificate no.	SEV 14 ATEX 0107 IECEx SEV 14.0002 CML 22UKEX3190
Date	09.09.2024
Operating temperature range	Tamb = [-10 °C…+60 °C] with LCD Tamb = [-40 °C…+60 °C] without LCD
In	[20 VDC…28 VDC], 2 W
Out	[4 mA…20 mA], 2-Wire Current Loop
Symbols

MORE INFO

ProcessSensing.com

Rotronic.com

Documents / Resources

Rotronic HygroFlex5-EX Humidity Temperature Transmitter [pdf] Instruction Manual
HF520-EX, HygroFlex5-EX Humidity Temperature Transmitter, HygroFlex5-EX, Humidity Temperature Transmitter, Temperature Transmitter, Transmitter

References

User Manual

Rotronic HygroFlex5-EX Humidity Temperature Transmitter

FAQs

OVERVIEW