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If the flowmeter is equipped with lifting rings, they must be used. The flowmeter must never
be handled, lifted or secured by the electronic enclosures.
Unpacking
Upon receipt of the TZN turbine meter, inspect the packing case for any shipping damage. The
meter must be carefully removed from the packing case and inspected for potential damage or
missing parts (including documentation). Protective devices such as end caps must be removed
prior to installation.
Storage
If the flowmeter is not installed as soon as it is received, it must be stored and protected from
the elements. In case of extended storage (more than a year), check applicable regulation to ensure
that all calibration requirements have been met.
Return
Contact Faure Herman prior to any return. If the flowmeter has been used with hazardous,
corrosive, or toxic substances, the operator must make sure that it has been correctly rinsed,
cleaned, and decontaminated before being returned to Faure Herman.
ATEX & IEC Ex Installation
This equipment is ATEX and IEC Ex certified and complies with the essential Health and Safety
requirements relating to the design and construction of equipment intended for use in potentially
explosive atmospheres (2014/34/EU Directive).
Please ensure this equipment is used in total compliance with the instructions given on the
ATEX certificate and nameplate. Consult the user manuals, as well as equipment installation and
maintenance manuals for this device to ensure safe operation of this equipment.
This equipment contains non-electrical and electrical components which are both ATEX
certified relating to the design and construction of equipment intended for use in potentially
explosive atmospheres (Directive 2014/34/UE).
General Safety Information
The meter must be de-energized for all installation and maintenance activities.
For safe operation, the equipment must be used in compliance with its’ ATEX / IEC Ex
certificate and nameplate criteria. Observe all instructions for equipment and component parts
contained in user manual.
The equipment must be installed and operated only in areas complying with its hazardous
protection rating as specified on the plate attached to the meter.
If the equipment is connected to ancillary devices, check to ensure the electrical protection
systems are fully compatible.
According to ATEX Directive, turbine meter consists
of both mechanical and electrical parts. Each
component has its own certification which
combines to provide the complete meter protection
system and parameters.
Electrical components
ID plate
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Should a filter and air elimination system be used simultaneously, we recommend placing the
air eliminator as the last device upstream of flow conditioning.
In order to avoid erratic measurements caused by liquid cavitation, minimum back pressure
must remain greater than P
min
according to the expression:
v
min
P
25
.
1
P
2
P
×
+
∆
×
>
with
P
min
Minimum back pressure in bar [
psi
]
ΔP Meter pressure at flowing conditions in bar [
psi
]
P
v
Liquid vapor pressure at flowing conditions in bar [
psi
]
Note:
For LPG, minimum back pressure should be set at P
v
+ 1 bar [
+ 14.5 psi
]
Electrical Installation
TZN turbine meters integrate two (or three) detection systems allowing generation of two out
of phase pulse trains. An integrated preamplifier FH71 (required for distance between meter and
control room greater than 600 ft) receives low level signals from the pick-up coil, and converts
these into positive square wave signals for long distance transmission (greater than 600 ft).
Preamplifiers are available in either a 2-wire (Intrinsically Safe versions) or 3-wire (non IS)
configuration.
Connection between the coil and preamplifier (or terminal) is completed in factory.
2 or 3 wire preamp
No preamp
Figure 8. Factory wiring of pickup coil: with and without preamp
Hazardous area classification must be checked prior to connection (refer to ATEX or UL plate).
Depending on preamplifier type (2 wire Standard, NAMUR or 3 wire Open Collector); connect
the field shielded wire according to figures below.
2 wire preamp
(Standard / NAMUR)
3 wire preamp
(Open Collector)
Figure 9. Types of preamplifiers
