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directly to the circuit board of the measuring module with a spring loaded quick connector and the cable is
routed through an M12 gland in the rear of the enclosure which provides sealing to IP 65.
FT10-CS
This module is identical in operation and specification with FT10-ES with the exception that this module has
an externally accessible standard 4-pole M12 sensor connector (receptacle) mounted on the rear of the
enclosure. The module is supplied together with a compatible M12 plug connector which can be used to
connect the sensor.
FT10-RHT
This module measures both ambient temperature with an integrated Pt100 temperature sensing element
and relative humidity with a modern digital capacitive humidity sensor module. The humidity sensor is
mounted on a circuit board protruding from the bottom of the module. This circuit board and sensor are
protected with a replaceable filter element. The selected filter type defines the sealing class of the device
and also determines the response time of the humidity sensor and the type of environment where the
transmitter can be operated.
Just like other FT10 series measuring modules the FT10-RHT sends the temperature reading with the ID
marked on the connected radio transmitter module but the humidity reading is sent with ID+1000.
Preparations
The devices are delivered with the measuring and transmitter modules separated in order to conserve the
batteries during storage and transport. The device will start to measure and transmit as soon as the two
modules are put together. Prior to installing the radio transmitter modules at their target locations, the
devices should be put together and it should be checked that each device starts to transmit.
When putting the modules together, make sure that the two parts are pushed together all the way so that
the locking latches snap into position. This is important for ensuring the watertight sealing of the modules.
It is also important because when the temperature rises, the pressure inside the device will rise slightly as
the air caught inside cannot expand in the sealed space. Rising pressure could eventually push the modules
apart and compromise the sealing, if the latches are not properly locked.
It's always a good idea to make an installation plan of all the target locations and their names. It is then
easy to write down the ID numbers of the transmitters that are installed in these places.
Maximum number of transmitters
International radio standards limit the use of radio frequencies and they also limit the use of the license-
free ISM frequency band that Nokeval transmitters use. The maximum total number of Nokeval radio
transmitters that can be simultaneously used in the same coverage area depends on the transmit interval.
The following table gives guidelines on the maximum number of transmitters with different setups. The
default interval is 80 seconds for FT10-IS and FT10-RHT, and it is 40 seconds for FT10-ES and FT10-CS.
Transmit interval can be individually adjusted for each transmitter as instructed in the chapter Configuring.
Interval
Receiver(s) only
5 s
22
Installation
Receiver(s) and 1 repeater
11
5
Receiver(s) and 2 repeaters
7
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