Thermocouple Converter DAT2145 with DIP Switch programmability.
The thermocouple Converter DAT2145 is a Din Rail mount temperature Converter with DIP Switch programmability.
The output can be Voltage or Current.
Suitable for the following thermocouples.
K Type Thermocouples
J Type Thermocouples
S Type Thermocouples
R Type Thermocouples
T Type Thermocouples
The DAT2145 will linearize the voltage input and provide a 4-20mA output signal.
The DAT2145 is accurate to 0.1% full scale and has less than 0.02%/'f thermal drift.
It is possible to set the minimum and maximum values of the input and output ranges in any point of the scale, keeping the minimum span shown in the table below. Also high burn out indication or low burn out indication is selectable.
The DAT2145 is in compliance with the standard 89/336/CEE on the Electromagnetic Compatibility.
The DAT2145 is housed in a plastic enclosure of 12.5 mm thickness suitable for DIN rail mounting in compliance with EN-50022 and EN-50035 standards.
The DAT2145 has internal cold junction compensation.
The Calibration of zero and span values is made by the ZERO and SPAN potentiometers located on the top of device.
The converter DAT2145 must be powered by a direct voltage included in the 18 V to 30 V range. The power supply must be applied between the terminals R (+Vdc) and P (GND), or alternatively between the terminals Q (+Vdc) and O (GND).
The output connections must be made as shown in the section "Output connections".
The current or voltage output signal is measurable between the terminals N (OUT V/I) and P (GND), or alternatively between the terminals M (OUT V/I) and O (GND).
The input connections must be made as shown in the section "Input connections".
The thermocouple sensor must be connected between the terminals L (+TC) and I (-TC); in case of use of a shielded cable, connect the shield to the terminal I .
The configuration of input and output ranges values is made by DIP-switches (refer to the section “Input range table” and “Output range table”).
After the converter configuration, it is necessary to calibrate it using the ZERO and SPAN regulations; this operation is illustrated in the section “DAT2145:
Configuration and calibration”.
This operation can be made on field refer to a calibrated thermometer or using a simulator of thermocouple; in case of use of simulator of thermocouple with internal CJC, the value of voltage corresponding to the ambient temperature must be subtracted from the input voltage .
To install the device refer to the section “Installation instructions”.
The device DAT2145 is suitable for DIN rail mounting in vertical position. It is necessary to install the device in a place without vibrations .
Moreover, it is recommended to use shielded cable to connect signals and to avoid routing conductors near power signal cables.
1) Calculate the difference between the maximum and the minimum value of the input range (Span).
2) Refer to the “ Input ranges table " and determine in the column " SPAN" the position where the calculated value is included, then referring to the position obtained determine in the column “ZERO”, the line in which the minimum value is included . In the correspondent line is shown as to set the DIP-switches .
3) Set the DIP-switches as indicated .
4) Connect on input a 3 wire Pt100 simulator programmed to supply the maximum and minimum values of the input range or a fixed resistor of the same values.
5) Set the simulator at the minimum temperature or to connect a fixed resistor correspondent to the minimum value .
6) By the ZERO potentiometer calibrate the output at the 4 mA value .
7) Set the simulator at the maximum temperature or to connect a fixed resistor correspondent to the maximum value .
8) By the SPAN potentiometer calibrate the output at the 20 mA value .
9) Repeat the operation from the step 5 to the step 8 until the output value will be correct ( 3 attempts typically required).
Configuration ex. : 0/400 °C Tc “K” out 0÷10 Vdc
Span => 400°C;
Input switches configuration (DSI ): On, On, On, On.
Output switches configuration (DSO ): Off, On, Off, On, Off.