YOKOGAWA Dpharp EJA438N, Руководство пользователя

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IM 1C22J1-01E 2-1
2. HANDLING CAUTIONS
2. HANDLING CAUTIONS
This chapter describes important cautions regarding
how to handle the transmitter. Read carefully before
using the transmitter.
The EJA Series pressure transmitters are thoroughly
tested at the factory before shipment. When the
transmitter is delivered, visually check them to make
sure that no damage occurred during shipment.
Also check that all transmitter mounting hardware
shown in Figure 2.1 is included. If the transmitter was
ordered without the mounting bracket, the transmitter
mounting hardware is not included. After checking the
transmitter, repack it in the way it was delivered until
installation.
Mounting bracket
U-bolt nut
U-bolt
Transmitter
mounting bolt
F0201.EPS
Figure 2.1 Transmitter Mounting Hardware
2.1 Model and Specifications
Check
The model name and specifications are indicated on the
name plate attached to the case. If the reverse operat-
ing mode was ordered (reverse signal), ‘
REVERSE ’
will be inscribed in field *1.
Figure 2.2 Name Plate Example of JIS Flameproof Type
2.2 Unpacking
When moving the transmitter to the installation site,
keep it in its original packaging. Then, unpack the
transmitter there to avoid damage on the way.
2.3 Storage
The following precautions must be observed when
storing the instrument, especially for a long period.
(a) Select a storage area which meets the following
conditions:
• It is not exposed to rain or water.
• It suffers minimum vibration and shock.
• It has an ambient temperature and relative
humidity within the following ranges.
Ambient temperature:
–40 to 85
°
C without integral indicator
–30 to 80
°
C with integral indicator
Relative humidity:
5% to 100% R.H. (at 40
°
C)
Preferred temperature and humidity:
approx. 25
°
C and 65% R.H.
(b) When storing the transmitter, repack it as nearly
as possible to the way it was packed when
delivered from the factory.
(c) If storing a transmitter that has been used,
thoroughly clean the diaphragm surface of the
diaphragm seal (pressure-detector section), so that
no measured fluid remains on them. Also make
sure before storing that the pressure-detector and
transmitter assemblies are securely mounted.
2.4 Selecting the Installation
Location
The transmitter is designed to withstand severe
environmental conditions. However, to ensure stable
and accurate operation for years, observe the follow-
ing precautions when selecting an installation loca-
tion.
(a) Ambient Temperature
Avoid locations subject to wide temperature
variations or a significant temperature gradient. If
the location is exposed to radiant heat from plant
equipments, provide adequate thermal insulation
and/or ventilation.