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1. SAFETY PRINCIPLES
before you start to use the device, become familiar with the present instructions;
in order to avoid electrocution or damage to the device, its mechanical and electrical installation must be
performed by qualified staff;
before switching on the power supply, make sure that all cables and wires are properly connected;
before making any modifications to the wire and cable connections, switch off the device's power supply;
ensure proper operating conditions compliant with the technical specification of the device (power supply
voltage, humidity, temperature - see chapter 5).
2. INSTALLATION GUIDELINES
The device is designed so as to ensure an appropriate level of immunity to most interferences that may occur in
industrial environments. In environments of unknown level of interferences, it is recommended to implement the
following measures so as to prevent potential interference with the operation of the device:
do not supply the device from the same lines as high-power equipment without using appropriate power line
filters;
use cable shields on power supply cables, sensor cables, and signal cables, whereby the earthing of the shield
should be single-point and located as close to the device as possible;
avoid running instrument (signal) cables in the direct vicinity of and parallel to power distribution and power
supply cables;
it is recommended to use twisted pair signal cables;
in the case of sensing resistors in 3-wire connections, use identical wires;
avoid locating remotely controlled, electromagnetic meters, and high-power loads, loads with phase or group
power control, and other devices producing large impulse interferences close to one another;
ground or zero metal rails on which rail-mounted devices are installed.
Make sure to remove the protective film from the LED display before the first use of the device.
3. GENERAL CHARACTERISTICS OF THE METERS
measurement of temperature and other physical values (humidity, pressure, level, speed, etc.) processed to a
standard electrical signal (0/4÷20mA, 0÷10V, 0÷60mV, 0÷2,5kΩ);
1 universal measurement input (thermoresistance, thermocouple, and analog) with memory of the minimum
and maximum measured value and a remote data display function (over the MODBUS-RTU protocol); (except
for AR500)
programmable digital input (except for AR500) for changing the operation mode of the meter:
manual/automatic mode for the analog output, keypad block, stopping the display indications (HOLD
function)
analog output (except for AR500) 0/4÷20 mA or 0/2÷10 V (retransmission, alarm/control, manual)
manual mode for the analog output (open control loop) enabling setting the output signal value in the range
of 0-100% (except for AR500)
digital LED readout with programmable color (only AR517) and illumination brightness
signaling of alarm status with variable display color (only AR517)
integrated 24 V DC power supply supplying the field transducers (except for AR500)
RS485 serial interface (galvanically isolated, MODBUS-RTU protocol, except for AR500)
compensation of line resistance for resistance sensors and of temperature of cold thermocouple tips;
programmable type of input, range of indications (for analog inputs), alarm, display, communication, and
access options, and other configuration parameters
access to configuration parameters protected with a user password
parameter configuration methods:
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