Wika BWX Uživatelský manuál stáhnout pdf (Strana 3)

INSTRUCTION MANUAL

NI-222E

Rev. 1 12/02

Fig. 2 -

Electrical connections and adjustment screws

One contact instruments

Two contact instruments

Microswitch electrical circuit

State of the contacts at at-

mospheric pressure

1 - Microswitch set point calibration screws

3 - Terminal block

4 - Electrical connection identification plate

1 - Microswitch 2 set point calibration screws

2 - Microswitch 1 set point calibration screws

3 - Terminal block

4 - Electrical connection identification plate

Designation of the contacts:

C - common

NA - Normally open

NC - Normally closed

5 - SET POINT CALIBRATION

In order to proceed with the calibration and the periodical

functional verification of the instrument a suitable cali-

bration circuit (fig. 5) and an adequate pressure source

is required.

5.1 PRELIMINARY OPERATIONS

Weatherproof pressure switches (BWX)

Remove the blocking device fixed to the side of the in-

strument case and the adjustment screw access plate

(Fig. 3). Remove the cover by rotating it in an anticlock-

wise direction.

Fig. 3 - Weatherproof pressure switch blocking device -

a - Plumbing wire

b - Plumbing

c - Blocking nut

d - Blocking bracket

e - Adjustment screw access

plate

Explosionproof pressure switches (BAX) (Fig. 4)

CAUTION: do not open the cover of explosionproof

pressure switches (Series BAX) when energized, in

explosive atmospheres.

Loosen the locking headless screw situated on the

cover using a 1,5 hexagonal key then unscrew the cover.

Remove the internal blocking device inserted on the

closure plugs and slide out the plugs.

Fig. 4 -

Explosionproof pressure switch blocking device

5.2 CALIBRATION CIRCUIT AND OPERATIONS

Prepare the control circuit as indicated in Fig.5.

The warning lamps should be connected to contact 1 or

2 in the NO or NC position according to the required

contact action.

Connection of C and NO terminals

• If the circuit is open at the working pressure, the

switch closes the circuit as the pressure increases

when the desired value is reached.

• If the circuit is closed at the working pressure, the

switch opens the circuit as the pressure decreases

when the desired value is reached.

Connection of C and NC terminals

• If the circuit is closed at the working pressure, the

switch opens the circuit as the pressure increases

when the desired value is reached.

1 2 3 4 5 6 7

INSTRUCTION MANUAL 1
NI-222E 1

Komentáře k této Příručce

Žádné komentáře

Wika BWX Uživatelský manuál Strana 3

Komentáře k této Příručce

Související produkty a manuály pro Měřící nástroje Wika BWX