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3.1 Functional description
The DTI is used for measuring inputs from two PT100 sensors in the range 0 to 360
Ω
(-200
to 750
°
C). The two sensors are connected to the connectors in the top plate. The input signal
is compared to the two internal resistor references from which the input signal can be
determined.
The DTI operates with a 2*20 character display, which continuously read out the two inputs.
The input value can be shown as the actual read value for both sensors, the peak values for
sensor 1 or 2, the differential value for the two sensors or as the differential peak value for the
two sensors.
The input value can be shown in
Ω
,
°
C,
°
F or K selected by the user.
The resolution in temperature can be 0.1 or 0.01 for both models and also 0.001 for DTI 1000.
The 4th order polynomial coefficients can be inspected by the user and changed in the
software program.
The DTI 1000 also has analog output which corresponds to the temperature value for the
input where the signal range is from -0.5 to 3.75 volt. The gain and offset can be altered by
the user in the software program.
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The power supply is made by eight 1.5 Volt batteries or a mains adapter (optional extra). Use
only mains adapter supplied by AMETEK in order to comply with the requirements in
EN50081-1 (1992) and EN50082-1 (1992).
It is possible to connect the shields from the cables to the cabinet, in order to reduce the
influence of noise.
Both models are supplied with RS232 and software, in order to have the possibility of saving
the measured data and to recalibrate the DTI or the sensors.
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Note:
If the temperature is outside the range set by gain and offset, the value of the
analog output signal is undefined.
