Yokogawa EJA530A Manuel d'utilisateur télécharger pdf (Page 52)

IM 01C21F01-01E

9-3

9. MAINTENANCE

9.4 Disassembly and Reassem-

bly

CAUTION

Precautions for CENELEC and IECEx Flame-

proof Type Transmitters

• Flameproof type transmitters must be, as a

rule, removed to a non-hazardous area for

maintenance and be disassembled and reas-

sembled to the original state.

• On the flameproof type transmitters the two

covers are locked, each by an Allen head bolt

(shrouding bolt). When a shrouding bolt is

driven clockwise by an Allen wrench, it is going

in and cover lock is released, and then the

cover can be opened by hand.

When a cover is closed it should be locked by a

shrouding bolt without fail. Tighten the shroud-

ing bolt to a torque of 0.7 N·m.

This section describes procedures for disassembly and

reassembly for maintenance and component replace-

ment.

Always turn OFF power and shut off and release

pressures before disassembly. Use proper tools for all

operations. Table 9.4.1 shows the tools required.

Table 9.4.1 Tools for Disassembly and Reassembly

Tool RemarksQuantity

Phillips screwdriver

Slotted screwdriver

Allen wrenches JIS B4648

One each, nominal 3 and

5 mm Allen wrenches

Wrench

Torque wrench

Adjustable wrench

Socket wrench

Socket driver

Tweezers

JIS B4633, No. 2

Width across flats, 17 mm

Width across flats, 16 mm

Width across flats, 5.5 mm

T0902.EPS

Shrouding Bolt

F0902.EPS

Figure 9.4 Shrouding Bolts

9.4.1 Replacing the Integral Indicator

CAUTION

Cautions for Flameproof Type Transmitters

Users are prohibited by law from modifying the

construction of a flameproof type transmitter.

This would invalidate the agency approval and

the transmitter’s use in such rated area.

Thus the user is prohibited from using a flame-

proof type transmitter with its integral indicator

removed, or from adding an integral indicator to

a transmitter. If such modification is absolutely

required, contact Yokogawa.

This subsection describes the procedure for replacing

an integral indicator. (See Figure 9.4.1)

 Removing the Integral Indicator

1) Remove the cover.

2) Supporting the integral indicator by hand, loosen its

two mounting screws.

3) Dismount the LCD board assembly from the CPU

assembly.

When doing this, carefully pull the LCD board

assembly straight forward so as not to damage the

connector pins between it and the CPU assembly.

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 66 67

Commentaires sur ces manuels

Pas de commentaire

Yokogawa EJA530A Manuel d'utilisateur Page 52

Commentaires sur ces manuels

Produits connexes et manuels pour Capteurs Yokogawa EJA530A