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6.3. Technical Specifications
6.3.1. General Specifications
Category
Signals to Central
Controller
Power Supply and Relays
Wiring
Analog Current
Analog Voltage
Modbus RTU over
RS-485
Operating voltage
Inrush current
Operating power (max)
Relay rating
Audible alarm
Alarm delay
Power and analog signal
Modbus network
Cable gland
Table 6-1 - General Specifications
Specifications
Normal operation: 4 to 20mA (default)
Drift below zero: 3.8mA
Measuring range exceeded: 20.5mA
Instrument fault: ≤ 1.2mA
Fault on analog interface: > 21mA
Offline mode/Maintenance signal: 3mA steady
signal
0 to 5V; 1 to 5V; 0 to 10V; 2 to 10V
(selectable) During fault condition, 1 to 5V
and 2 to 10V outputs are 0V.
Baud rate: 9,600 or 19,200 (default)
(selectable)
Start bits: 1
Data bits: 8
Parity: None, Odd, Even (default) (selectable)
Stop bits: 1 or 2 (selectable)
Retry time: 500 ms, min time between retries
End of message: Silent 3.5 characters
19.5 to 28.5VDC; 24VAC ± 20%, 50/60 Hz
1.5 A
MRLDS-450: 4W, 170mA @ 24VDC
3 SPDT
1 A at 24VAC/VDC, resistive load
Internal Buzzer ≥72 dB at 4" (10cm)
0 to 15 minutes (selectable)
2-core shielded cable, 16 to 20 AWG (0.5 to
1.5mm2)
3-core, 2 twisted pair + ground, shielded cable
with 120 Ω characteristic impedance, 16 to 24
AWG (0.5 to 1.5 mm2)
M20, 10-14mm cable outer diameter
M16, 4-8mm cable outer diameter
29
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