Output; Output Signal; Signal On Alarm; Load - Endress+Hauser Promass 84F Technical Information

Proline Promass 84F

Output signal

Signal on alarm

Load

Low flow cutoff

Galvanic isolation

Switching output

Endress+Hauser

Output

Current output, HART
Active/passive selectable, galvanically isolated, time constant selectable (0.05 to 100 s), full scale value
selectable, temperature coefficient: typically 0.005% o.r./°C, resolution: 0.5 μA
< 700 Ω (for HART: R
• Active: 0/4 to 20 mA, R
L
• Passive: 4 to 20 mA; supply voltage U
Pulse / frequency output, HART
For custody transfer measurement, two pulse outputs can be operated.
Passive, galvanically isolated, open collector, 30 V DC, 250 mA
• Frequency output: Full scale frequency 2 to 10000 Hz (f
2 s. In "Phase-shifted pulse outputs" operating mode, the end frequency is limited to a maximum of 5000 Hz.
• Pulse output: Pulse value and pulse polarity selectable, pulse width configurable (0.05 to 2000 ms)
Pulse / frequency output, MODBUS
Active/passive selectable, galvanically isolated
• Active: 24 V DC, 25 mA (max. 250 mA during 20 ms), R
• Passive: Open Collector, 30 V DC, 250 mA
• Frequency output: Full scale frequency 2 to 10000 Hz (f
2 s.
• Pulse output: Pulse value and pulse polarity selectable, pulse width configurable (0.05 to 2000 ms)
MODBUS interface
• MODBUS device type: slave
• Address range: 1 to 247
• Functions codes supported: 03, 04, 06, 08, 16, 23
• Broadcast: supported with the function codes 06, 16, 23
• Physical interface: RS485 in accordance with standard EIA/TIA-485
• Baud rate supported: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 Baud
• Transmission mode: RTU or ASCII
• Response time:
Direct data access = typically 25 to 50 ms
Auto-scan buffer (data area) = typically 3 to 5 ms
• Possible output combinations → ä 9
• Current output: Failsafe mode selectable (e.g. in accordance with NAMUR Recommendation NE 43).
• Pulse/frequency output: Failsafe mode selectable.
• Relay output: De-energised by fault or power supply failure.
• MODBUS RS485: If an error occurs, the value NaN (not a number) is output for the process variables.
See "Output signal"
Switch points for low flow cutoff are selectable.
All circuits for inputs, outputs, and power supply are galvanically isolated from each other.
Relay output
• max. 30 V / 0.5 A AC; 60 V / 0.1 A DC
• galvanically isolated
• Normally closed (NC or break) or normally open (NO or make) contacts available
(factory setting: relay 1 = NO, relay 2 = NC)
≥ 250 Ω)
L
≥ 150 Ω
18 to 30 V DC; R
S i
= 12500 Hz), on/off ratio 1:1, pulse width max.
max
> 100 Ω
L
= 12500 Hz), on/off ratio 1:1, pulse width max.
max
7