HD 978TR3 Configurable converter signal amplifier with 4÷20mA (20÷4mA). Input measuring range -10 ..+60mVdc. Standard configuration 0÷20mVdc. Minimum measuring range 2mVdc. Configurable with HD778 TCAL
HD 978TR4 Configurable converter signal amplifier with 0÷10Vdc (10÷0Vdc).
Input measuring range -10 ..+60mVdc. Standard configuration 0÷20mVdc. Minimum measuring range 2mV.dc Configurable with HD778 TCAL
HD 778 TCAL Power generator in the range -60mV…+60mV, regulated by PC through RS232C serial port, DELTALOG-7 software for setting K, J, T , N thermocouple transmitters and HD 978TR3, HD 978TR4 converters.

HD 778TR1, HD 978TR1 and HD 978TR2
are 4…20mA two-wired passive transmitters
with a microprocessor.
These can be configured for thermocouple
sensors type K, J, T and N.

They convert the voltage value generated by
the thermocouple into an electric linear signal
within the 4…20mA range.
The use of digital devices obtains excellent
precision and stability in time.

The user can set the 4…20mA (or 20…4mA) output in any temperature range included in the measurement range of the individual thermocouples
with a minimum range of 50 °C. The range and type of thermocouple are simply set by using one button. A led signals the alarm situation (out of order or unconnected sensor) and helps the user during the programming phases. The transmitters are also protected against polarity inversion. HD778TR1 is specifically designed to be installed on DIN B connection heads; are suitable for mounting on 35 mm DIN bars. In addition to the 4…20mA output, HD978TR2 has a 31⁄2 digit display (height 10 mm) that allows the measured temperature to be displayed.