User Manual - PolyXeta
®
2 Detector with HL Sensor
for Refrigerant Gases - May_2020
Page
10
PolyXeta
is a registered trademark of MSR
Made in Germany
GAPX2_Freon_E_2020_05_18
Phone: +49 8531 9004-0 Fax: +49 8531 9004-54
Specification subject to change without notice
MSR-Electronic GmbH, Buergermeister-Schoenbauer-Str. 13, D 94060 Pocking
www.msr-electronic.de
4
Electrical Installation
The instrument PX2-1 must only be opened under gas-free and voltage-free conditions.
The instrument PX2-2 should only be opened under gas-free and voltage-free
conditions.
The enclosed cable gland has to be checked for admissibility for the requested
requirements before installation in position “Entry 3”. If the
instrument is supplied
without cable gland, a special cable gland approved for Ex protection class Ex db (PX2-1)
or nA (PX2-2) and for the requirements of the application has to be mounted there.
When inserting the cables, you have to strictly follow the instructions enclosed to the
cable glands.
No insulating sealing material must be poured into the NPT ¾ "threads of the cable
gland and blanking plugs because the potential equalization between housing and cable
gland / blind plugs is via the thread.
The cable gland / blind plugs must be tightened with a torque key with 15 Nm. Only
when doing so you can ensure the required tightness.
After completion of work, the instrument must be closed again. The cover has to be
completely screwed in and secured with the locking screw against inadvertent
loosening.
4.1
General Notes
•
In the version with display, the terminals are located behind the display. The required disassembly
and subsequent assembly of the display is described in chapter 11.
•
Only a professional should perform the wiring and the connection of the electrical installation
according to the wiring diagram in compliance with the relevant regulations and only when de-
energized!
•
When connecting cables and conductors, please observe minimum length of 3 m according to EN
60079-14.
•
Connect the housing to the equipotential bonding via the external ground terminal.
•
Depending on the model there are female threads NPT ¾ inch on the housing at the positions "Entry
2 and 4" for placing additional cable glands. These inlets are factory sealed with original plugs. After
completing the installation work, make sure that all unused entries are closed with blind plugs
approved for Ex
db (PX2-1) or nA (PX2-2)
and for the requirements of the application. Thread adapters
for reducing the cable glands or dummy plugs are not admitted.
•
All terminals are Ex e type with spring contact and push actuation. The permissible conductor cross
section is 0.2 to 2.5 mm
2
for single wires and multi-wire cables.
•
Use cables with a braided shield with > 95 % coverage for compliance with the interference
immunity. The shield must be connected to the inside connection of the housing with a maximum
length of about 35 mm.
•
For the recommended cross sections and lengths please refer to the table 4.1 "Cables".
•
The analog output signal of warning devices without display can be used for the measurement
control. To carry out these regular checks with the housing closed it is recommended to lead the
analog signal out to the safe area via a cable.
•
To comply with the requirements of servicing or operating the device without opening it, it is
possible to calibrate or operate the device remotely via the central bus. For this it is necessary to
lead the central bus out to the safe area via a cable.
