
4-CHANNEL SCANNER-8204
REF NO: m82/om/101
Issue NO: 09
User‟s Manual - 9 -
Input Impedance: >1 Mohm for thermocouple/ mV/RTD/Volts inputs
Noise Rejection Ratio:
NMRR (Normal mode rejection ratio) > 40 dB (50/60 Hz) or more
CMRR (Common mode rejection ratio) > 120 dB (50/60 Hz) or more
Allowable wiring resistance for RTD: Maximum 15 ohms/wire (Conductor
resistance between three wires should be equal).
Retransmission Output: (Optional)
Number of outputs: 1
Output signal: 0-20 mA, 4-20 mA, 0-5 V, 1-5 V or 0-10 V DC.
Voltage or current output can be selected through software and internal jumper
settings.
Load resistance: 500 ohms Max. Or less for current output. 3k or higher for voltage
output
Output accuracy: ±0.25% of span
Relay Contact Outputs:
Number of outputs: 4
Output signal: Two terminals (NC/NO and C) (NC/NO is selectable by jumper setting)
Relay Contact rating: 250 V AC or 30 V DC, 2A (resistive load)
Communication:
Communication Type: Half duplex/Asynchronous (RS-485)
Communication Protocol: MODBUS RTU
Baud rate, Parity and Stop bit are selectable form the key board.
All parameters are Configurable through MODBUS.
Connectable number of unit: 32
Communication error Detection: CRC Check
Display Specifications:
PV display: 4-digits, 7-segment, Red LEDs, character height of 0.56‟‟
Channel No. Display: 1-digit, 7-segment, Green LEDs, character height of 0.56‟
Statu s ind icatin g l amps: 4-Red LEDs for Relay status ,1-Red LED Manual mode
status, 2-Red LEDS for Communication.
Power Supply Specifications:
Power supply: Rated voltage of 85 to 260V AC at 50/60 Hz, Rated Dc voltage 100 to
300VDC / Rated Voltage of 18V to 36V DC(Optional)
Power consumption: Max. <10 VA
Data backup: Non-volatile memory (can be written up to 100000 times)
Withstanding Voltage:
Between primary terminals* and secondary terminals** at
least 1500VAC for 1 minute
Between secondary terminals at least 500V AC for 1 minute