Data Sheet for Product

Siemens

Datasheet

A6V11600411_en

Smart Infrastructure 2019-08-07

A transformer for safety extra low-voltage (SELV) with separate windings for 100 % duty is

required to power the sensor. When sizing and protecting the transformer, the local safety

regulations must be complied with.

When sizing the transformer, the power consumption of the room sensor must be taken into

consideration.

For correct wiring of the sensor, refer to the Data Sheets of the devices with which the

sensor is used.

The permissible line lengths must be considered.

Cable routing and cable selection

It must be considered for routing of cables that the longer the cables run side by side and the

smaller the distance between them, the greater the electrical interference. Shielded cables

must be used in environments with EMC problems.

Twisted pair cables are required for the secondary supply lines and the signal lines.

Note to QFA2079

Terminals G1(+) and I1(-) of the humidity output must always be connected to power, even if

only terminals G2(+) and I2(-) of the temperature output are used!

G1(+) and I1(-) are galvanically isolated towards G2(+) and I2(-).

Mounting

Location

Inside wall (not on outside wall!) of the room to be air conditioned; not in recesses, behind

curtains, above or close to heat sources or shelves not on walls behind which a chimney is

located. The unit must not be exposed to spot lights or direct solar radiation.

Install the sensor in the occupied space about 1.5 m above the floor and at least 50 cm from

the next wall.

The end of the conduit at the sensor must be sealed to prevent false measurements due to

draughts through the conduit.

Mounting instructions

Mounting instructions are printed on the inner side of the package.

Chemical vapors

It is of great importance to understand that a humidity sensor is a sensitive measure device

and needs to be handled with care. Chemical vapors at high concentration in combination

with long exposure times may offset the sensor reading.

NOTICE

Avoid

direct contact with chemicals in any form. Do not touch sensitive components with

bare hands or tools this will negatively impact measurement accuracy.

Commissioning

Check wiring before switching on power. The temperature measuring range must be

selected on the sensor, if required.

Wiring and the output signals can be checked by making use of the test function (refer to

Mechanical design [➙ 2]).

We recommend not to use voltmeters or ohmmeters directly at the sensing element.