
The device supports a general-purpose analog input that can be used as a transducer
input. It supports voltage mode -5…5 V, ±300 mV (-10...+55°C, 0 V...+5 V).
The input can be used as current mode 4...20 mA using an external resistor.
4.5.1
Temperature measurement
The device has four temperature sensors.
4.5.1.1
Processor temperature
The ambient temperature of the process is measured by a sensor whose measurement
result is available on the System tab of the Web user interface and with the command
line command temperature. The measurement data of the sensor is not available with
protocol communication.
4.5.1.2
Communication module temperature
The internal temperature of the wireless communication module is available on the
Web user interface under
Tools/Modem Info
and with the command line command
modeminfo. The measurement data of the sensor is not available with protocol
communication.
4.5.1.3
Sensor for the temperature compensation of the charging voltage
The internal sensor of the device adjusts the battery charging voltage based on the
battery temperature. The data about the temperature is gained with the help of a 2.2 kΩ
NTC thermistor that is connected to pins 3 and 5 of the connector X2.1. The thermistor
is located between the batteries. The measurement data of the sensor is not available
with protocol communication but it is only used for adjusting the charging voltage.
4.5.1.4
Ambient temperature
The temperature of the device casing is used for estimating the ambient temperature.
Because the power consumption of the device affects the casing temperature, its effect
is compensated based on calculations. The compensation parameters are defined in
the setting file section [PHYSICAL_TEMP].
The ambient temperature calculated from the casing temperature is available with
protocol communication. The temperature object is defined in the setting file section
[TEMPERATURE_FPI]. This temperature is also used for temperature alarm
([TEMPERATURE_LOW_SPI], [TEMPERATURE_HI_SPI]), battery testing
temperature guard ([BATTERY_TEST]) and heater control ([HEATER]).
Example
Section 4
1MRS758459 C
Functional description
34
ARC600
User Manual