Operating instruction
Pressure Transmitter PT5N-…-FLR
for flammable refrigerants
Emerson Climate Technologies GmbH
Am Borsigturm 31 I 13507 Berlin I Germany
Date: 13.09.2019
PT5N-FLR_OI_ML_R05_866913.docx
G e n e r a l I nf o r ma t i o n :
The pressure transmitter PT5N-…P-FLR consists of a
hybrid film stainless steel measuring cell with a
diaphragm, installed in a stainless-steel housing. The
pressure measuring cell is fully welded. The pressure
transmitter is intended for use in flammable refrigerants
operated air conditioning and refrigeration systems as
well as heat pumps and it converts a pressure into a
linear electrical output signal.
PT5N-…P-FLR is preset to the specific measuring
range at the manufactures plant. An additional setting
is not possible. The pressure transmitter can only be
used in hazardous area defined by zone 2 (category 3).
S a f e ty i n s tr u c t i o n s :
•
The device may only be used for the purposes
specified in these instructions.
•
If the device is not used properly, serious bodily
injury and/or considerable damage to property
cannot be excluded. This should be kept in mind
particularly when the device was in use and is
replaced.
•
The installation, mounting and commissioning of
the
devices should be performed only by
trained personnel and should comply with the
standard EN 60079-14.
•
Flammable refrigerants require special handling
and care due to its flammability. Sufficient
ventilation is required during service of the
system. Contact with rapidly expanding gases can
cause frostbite and eye damage. Proper protective
equipment (gloves, eye protection, etc.) has to be
used.
•
Ensure that the system is correctly labeled with
applied refrigerant type and a warning for
explosion risk.
•
Do not release any refrigerant into the
atmosphere!
•
Do not exceed the specified maximum ratings for
pressure, temperature, voltage and current.
•
Before opening any system make sure pressure in
system is brought to and remains at atmospheric
pressure.
•
Before installation or service disconnect all
voltages from system and device.
•
Observe and avoid mechanical damage of housing
in order to maintain protection class.
•
Ensure that design, installation and operation are
according to European and national
standards/regulations.
I n s t a l l a t i o n ( F i g . 1 ) :
•
Before installation compare the controller data with
the data of the name plate.
•
The effects of UV radiation can cause materials to
become brittle. Protect the device from direct
sunlight.
•
Mounting directions per Fig.1 in order to prevent the
collection of contaminant in pressure sensing
element.
B r a z i ng ( F i g . 2 ) :
•
Perform and consider the brazing joint as per
EN 14324.
•
Before and after brazing clean tubing and brazing
joints.
•
Minimize vibrations in the piping lines by
appropriate solutions.
•
Use of flux and silver rod having a minimum of 30%
silver.
•
Do not exceed the max. body temperature of
120°C!
P r e s s ur e t e s t :
After completion of installation, a pressure test must be
carried out according to EN 378 for systems which
must comply with European pressure equipment
directive 2014/68/EU.
Warning:
•
Failure to do so could result in loss of refrigerant
and personal injury.
•
The pressure test must be conducted by skilled
persons with due respect regarding the danger
related to pressure
.
T i g h t n e s s t e s t :
Conduct Tightness test according EN378-2 with
appropriate equipment and method to identify tightness
of external joints. The allowable leakage rate must be
according system manufacturer’s specification.
E l e c t r i c a l c o n n e c ti o n :
•
Entire electrical connections have to comply with
local regulations.
•
Ensure that the system piping is grounded (Fig.3)
so housing of pressure transmitter has connection
to ground via brazed connection.
Note:
It is mandatory the electrical connection of
pressure transmitter housing to the ground
(grounding). If the connection is not
arranged/established via connection to grounded
piping system, it is necessary the electrical
connection via plug and cable assembly. It is required
an ATEX certified M12 plug and cable assembly
having 3 wires (2 wires for signal output and 1 wire
for grounding)
.
•
Connect the device to a low voltage power supply
with safe separation (SELV).
•
The device should only be supplied with limited
energy according to UL 61010-1 Second Edition,
Section 9.3 or LPS in conformance with UL 60950-1
or class 2 in compliance with UL 1310 or UL 1585.
•
Use only prewired M12 Connector PT4-M60-FLR
for connection to the pressure transmitter. PT4-M60-
FLR can be used in zone 2 (category 3).
•
During operation, the connector PT4-M60-FLR must
be protected by an appropriate housing against
external mechanical damage or shock (min. required
protection up to a mechanical action of 7 J - in
accordance with EN60079-0)
•
Cable end of PT4-M60-FLR must be connected to a
driver/controller in compliance with applicable
directives/standards for installation in hazardous
location.
-
If driver/controller is located out of hazard zone,
appropriate ATEX approved cable gland shall be
used in boundary of hazard zone and out of hazard
zone.
-
Applicable Driver/controller must contain
istrincally-safe
resistive
circuit and insured
maximum supply voltage below 30VDC and
maximum current below 100 mA.
-
If the cable needs to be extended (maximum total
length 6 m) in hazard zone, it is mandatory to use
ATEX approved type coupling or junction box.
Wiring and mounting of plug PT4-M60-FLR:
•
Do not bend or mechanically stress the cable outlet,
maintain a clearance of 20 mm to neighboring parts.
•
Ensure that the cables are mounted without tension;
always leave the cable a bit loose, but fixed.
•
Ensure that cables are not mounted near sharp edges.
•
Prewired plug and cable assembly
is ready for
connection to the Pressure transmitter.
•
Allow enough space on top of pressure transmitter to
mount plug as shown in Fig.5. The plug can be
mounted on pressure transmitter only in one position
(Fig.4 marking:
).
•
Prewired plug and cable assembly is ready for
connection to the transmitter.
1.
Push the plug on pins on top of the pressure
transmitter. (Fig.4)
2.
Rotate the nut one turn in clockwise direction and
push the plug.
3.
Repeat this procedure until the plug is tightened.
•
Disconnection of electrical plug from device only
when the power is switched off.
•
Ensure polarity for connection of 2-wire cable to
controller:
-
+24V DC to be connected to brown wire
-
Output Signal / 0V to be connected to white wire
O p e r a t i o n :
•
Perform a functional test of electrical circuit
before charging the system with refrigerant.
S e r v i c e / Ma i n t e na n c e :
•
The transmitter is maintenance-free. Defective
PT5N-…P-FLR must be replaced; they cannot be
repaired.
•
Disconnect electrical power before service.
•
Before any debrazing ensure that the flammable
refrigerant is pumped out of the system and the
room around the system is well vented so no
refrigerant left.
T e c h ni c a l d a ta o f P T 5 N - … P - F L R :
Supply voltage
10...30VDC, class III
Output signal
4…20 mA
Instrincally-safe
resistive circuit
Ui ≤ 30 V
Ii ≤ 100 mA
,
Pi ≤ 750 mA
internal inductance Li = 0 nH
internal capacitance Ci = 0 nF
Protection class
(EN 60529)
IP67 (PT4-M60-FLR)
Medium temperature
-30…+120°C
Ambient temperature
-25…+85°C
Released/compatible
for
All flammable refrigerants of
A3 group; mineral-, alkyl
benzene and ester lubricants
Marking
2014/34/EU
II 3 G
Ex ec IIC T4 Gc
Date of manufacture visible on label
YYMMDD-XXX-XX-XXXX
Date (year-month-day)
3 digits of the order number
Order position
Single part number
Only PT5N-…P-FLR types / PT4-M60-FLR, listed
in the following table, are released for use with
flammable refrigerants!
Type
Sensing
pressure
range
Max.
standstill.
Pressure
Part No.
PT5N-07P-FLR -0.8…7 bar
27 bar
805390/M
PT5N-10P-FLR -0.8…10 bar 27 bar
805391/M
PT5N-30P-FLR
0…30 bar
60 bar
805389/M
Type
Description
Part No.
PT4-M60-FLR
6.0 m cable length,
2-wire, ATEX certified
804806
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