Yokogawa EJA530A Manuel d'utilisateur télécharger pdf (Page 9)

IM 01C21F01-01E

2-1

2. HANDLING CAUTIONS

This chapter describes important cautions regarding

how to handle the transmitter. Read carefully before

using the transmitter.

The EJA-A 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 2.1.1 is included. If the transmitter

was ordered without the mounting bracket, the trans-

mitter mounting hardware is not included. After

checking the transmitter, repack it in the way it was

delivered until installation.

U-bolt nut (S)

Plate

U-bolt nut (L)

U-bolt (L)

Mounting bracket

(Flat type)

F0201.EPS

Adapter

U-bolt (S)

Figure 2.1.1 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 *

F0202.EPS

: Refer to USER'S MANUAL

Figure 2.1.2 Name Plate

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.

thoroughly clean the chambers inside the body, so

that no measured fluid remains in it. Also make

sure before storing that the 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.

(b) Ambient Atmosphere

Avoid installing the transmitter in a corrosive

atmosphere. If the transmitter must be installed in

a corrosive atmosphere, there must be adequate

ventilation as well as measures to prevent

intrusion or stagnation of rain water in conduits.

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Yokogawa EJA530A Manuel d'utilisateur Page 9

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