Sensor Error Adjustment Using Callendar Van Dusen Coefficients; Mounting; Installation Options; Installation In The Cover Of The Connection Head - ABB TTH300 Operating Instruction

3.1.3

Sensor error adjustment using Callendar van Dusen coefficients

Under normal circumstances, the standard Pt100 characteristic curve is used for resistance
thermometer measurement.
Recent technology has made it possible to achieve maximum measuring accuracy where
necessary, by means of individual sensor error adjustment. Sensor characteristic curves are
optimized through a Pt100 polynominal in accordance with ITS-90 / IEC 751 and EN 60150, and
by applying A ,B, C, or Callendar van Dusen coefficients.
The DTM or EDD can be used to set and store these sensor coefficients (Callendar van Dusen)
in the transmitter as a CVD characteristic curve. Up to five different CVD characteristic curves
can be stored for HART and PROFIBUS PA, while up to two can be stored for FOUNDATION
Fieldbus.
4

Mounting

4.1

Installation options

There are three options for installing the transmitter:
• Installation in the cover of the connection head (without springs)
• Direct installation on the measuring inset (with springs)
• Installation on a top-hat rail
4.1.1

Installation in the cover of the connection head

Fig. 4
1. Release the screw plug (3) for the cover of the connection head.
2. Open the cover (1).
3. Secure the transmitter (2) at the proper position on the cover, using the captive screws found
in the transmitter.
OI/TTH300-EN TTH300
Mounting
1
2
3
A00067
17