Description - Nokeval FT10 Series Manual

Description

General
FT10 series modules are housed in impact resistant plastic enclosures which, when properly connected
together, are watertight to IP 66. The joint between the two modules is sealed with two rubber O-rings.
The devices fulfill the mechanical and measuring accuracy requirements of the EN 13485 standard. They
also conform to the requirements of the standards EN 13486 and EN 12830 where applicable.
A complete FT10 series transmitter always consists of a transmitter module FT10-RT433 and one of the
measuring modules. The name and order code of the complete product is formed by combining the names
of the modules as in the following examples:
FT10-RT433 + FT10-IS = FT10-RT433-IS
FT10-RT433 + FT10-RHT = FT10-RT433-RHT
FT10-RT433
This is the radio transmitter module that is compatible and interchangeable with all FT10 series measuring
modules. It operates on the power supplied by the battery located in the measuring module and sends the
measurement results wirelessly over the 433.92 MHz license-free ISM (Industrial, Scientific and Medical)
band. The transmitting frequency and power have been carefully selected so that wireless measurements
are possible even from closed cold storage rooms with stainless steel walls. The power consumption of the
radio transmitter is so low, however, that it does not cause any adverse effects to living organisms or to
other nearby radio devices operating on other frequencies.
Each radio transmitter module has a unique ID number that is used to distinguish the measuring results
coming from each individual transmitter. The device is attached to the measuring target from the radio
transmitter module's mounting flanges, so when the measuring module is replaced the ID number does not
change.
FT10-IS
This module measures the ambient temperature using its internal Pt100 temperature sensing element, a
24-bit AD converter, a micro controller and a 1.5 V size AA alkaline battery. In typical use the endurance of
the battery is over two years which is longer than the predefined two-year calibration period of the
measuring module. Temperature measuring accuracy and stability of the device is very good. All units are
factory calibrated and individually adjusted for guaranteed accuracy better than ±0.5 °C over the
temperature range of -30...+50 °C.
Nokeval offers a very competitively priced calibration service for this measuring module type. The
calibration service is implemented with factory calibrated replacement measuring modules. The old
modules can be returned to the factory after the new ones have been received and installed, and only a
calibration fee will then be charged.
FT10-ES
This module measures the temperature with an external Pt100 temperature sensor. The measurement
technique is the same as in FT10-IS. The module can be ordered preinstalled with one of several different
types of Pt100 sensors or it can be ordered without a sensor. The module can also operate with most other
common resistive temperature sensing devices, e.g. Pt1000, Ni or Cu sensors. The sensor is connected
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