Technical Specifications
Additional Information • 37
6.3. Technical Specifications
6.3.1. General Specifications
Category
Specifications
Signals to Central
Controller
Analog Current
Normal operation: 4 to 20mA
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
Analog Voltage
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.
Modbus RTU over RS-485
Baud rate: 9,600 or 19,200 (selectable)
Start bits: 1
Data bits: 8
Parity: None, odd, even (selectable)
Stop bits: 1 or 2 (selectable)
Retry time: 500 ms, min time between retries
End of message: Silent 3.5 characters
Power Supply and
Relays
Operating voltage
19.5 to 28.5VDC; 24VAC ± 20%, 50/60 Hz
Inrush current
1.5 A
Operating power (max)
MRLDS-450: 4W, 170mA @ 24VDC
Relay rating
3 SPDT
1 A at 24VAC/VDC, resistive load
Audible alarm
Internal Buzzer ≥72 dB at 4” (10cm)
Alarm delay
0 to 15 minutes (selectable)
Wiring
Power and analog signal
2-core shielded cable, 16 to 20 AWG (0.5 to 1.5mm
2
)
Modbus network
3-core, 2 twisted pair + ground, shielded cable with 120
Ω characteristic impedance, 16 to 24 AWG (0.5 to 1.5
mm
2
)
Cable gland
M20, 10-14mm cable outer diameter
M16, 4-8mm cable outer diameter
Table 6-1
- General Specifications
