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12
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37
Wiring diagrams
Electrical connection to site (flow computer) depends on:
•
Protection type (Intrinsic Safety, Explosion Proof)
•
Flow Computer inputs characteristics (Impedance …)
•
Connection wire characteristics (resistance, inductance …) …
Wiring diagrams (below) can be used as ‘typical’. Additional configurations available on FH web site
(
https://faureherman.zendesk.com
).
2 wires FH71
A
B
C
o
il
2
1
160
Ω
± 5% 0.5 W
4
7
0
Ω
±
5
%
1
W
Ref Power Supply (0V)
Protection
fuse > 100 mA
24 VDC
Power Supply
AWG 16 shielded wire L < 500 m (1,500 ft)
2.5 < VDT < 10 V
(VDT: Voltage Detection Threshold)
white
blue
Figure 10
. Typical wiring diagram for 2 wires FH71with Input Impedance greater than 10 kΩ
3 wires FH71
A
B
C
o
il
3
1
white
blue
2
3.5 < VDT < 20 V
Ref Power Supply (0V)
1
.5
k
Ω
±
5
%
0
.5
W
Protection
fuse > 100 mA
5 to 28 VDC
Power Supply
(VDT: Voltage Detetcion Threshold)
AWG 16 shielded wire L < 500 m (1,500 ft)
Figure 11. Typical wiring diagram for 3 wires FH71 (Open Collector)
0 < VDT < 12V
3 wires FH71
A
B
C
o
il
3
1
white
blue
2
AWG 16 shielded wire L < 500 m (1,500 ft)
1
k
Ω
± 5%
250 mW
4
5
1
14
13
11
12
+
-
+
-
+
-
MTL5532
0V
1
k
Ω
±
5
%
1
W
Ref Power Supply (0V)
24 VDC
Power Supply
Figure 12. Example wiring diagram for 3 wires FH71 (Open Collector) with isolator
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Safety Consideration
Important Information Needed for Installation
This manual contains important instructions and safety information. It is essential to read and
understand the operating procedures prior to installation, connection, and commissioning of the
equipment.
Failure to observe these instructions and warnings may damage the flowmeter and/or
endanger personnel.
Personnel Requirements
Make sure that operators and maintenance personnel have all safety equipment applicable to
the area (safety glasses, protective headgear, safety shoes …) and are trained to operate the meter.
Unauthorized personnel should not have access to the operation of the meter.
Hazards arising from failure to observe the instructions and warnings
Failure to observe these instructions and warnings may:
•
Expose personnel to mechanical, electrical, or chemical risk
•
Damage the equipment (meter)
•
Pollute the environment by releasing hazardous substances
Safety instructions
Power supply must be disconnected and flow meter must be depressurized before servicing to
avoid electrical and/or pressure hazards. The safety instructions in this manual, as well as all
accident prevention and occupational safety regulations in force in the country of installation, must
be observed.
Conditions of operation
Conditions of use indicated on the data plate must be observed; equipment reliability is
guaranteed only if it is installed and used as described in these manuals.
Installation and maintenance operation shall be done using the proper tools. Never use a
hammer or any tools which can create sparks or damage the equipment’s electrical protection
(enclosure, cable gland, conduit …). If impact wrenches are used, pay attention to torque
recommendations listed in TZN Manual.
Installation, maintenance and repair of the equipment shall be carried out by suitably trained
personnel; all spare parts shall be approved by Faure Herman. No operation or repair which can
affect the protective system can be done on this equipment without authorization by Faure
Herman.
For specific installation and maintenance advice, contact the Faure Herman Worldwide
Customer Support & Service via phone, email or website:
Hotline: +1 (713) 597 4827 (North America)
+33 (0)2 43 60 28 55
Email:
Online Assistance website:
https://faureherman.zendesk.com/hc/en-us
Repair and maintenance
Repair, maintenance or potential modifications are allowed only after consultation with Faure
Herman. If any parts other than those approved by Faure Herman are used, Faure Herman cannot
be held liable for the consequences.
Transport, handling, and storage
The flowmeter must be handled with care to avoid damage. End caps are used to protect the
flanges during transport and handling.
