Ashcroft B400 pressure switches Uživatelský manuál stáhnout pdf (Strana 2)

NSTALLATION

hese controls are precision instruments and should never be

left with internal components exposed. During installation insure

that covers are in place and conduit openings are closed except

when actually working on the control.

MOUNTING B400 AND B700 SERIES

Three holes external to the enclosure for surface mounting.

ocation of these holes is shown on the general dimension

rawing.They may also be mounted directly on pressure line

sing the pressure connection.

hen tightening control to pres-

sure line, always use the wrench flats or hex on the lower housing.

ELECTRICAL CONNECTIONS

Remove cover

B400 Series – two screws hold cover to enclosure

B700 Series – cover unscrews

CONDUIT CONNECTIONS

Note –

It is recommended that Teflon tape or other sealant be

used on conduit, bushing or plug threads to ensure integrity of

the enclosure.

B400 Series standard – one

⁄

4˝ NPT conduit hole right side.

B700 Series standard – two

⁄

4˝ N PT conduit holes with one

permanent plug. NEMA 7 & 9 enclosures require proper conduit

seals and breathers as per the National Electrical Code.

B400 & B700 Series – XJL variation – two

⁄

4˝ NPT conduit

holes with two

⁄

4˝ to

⁄

2˝ NPT reducing bushings.

B400 Series – XJK v

ariation – tw

⁄

4˝ NPT conduit holes

B400 SERIES

SPDT

–

Wire directly to the s

witch according to circuit require

ments. On controls with pilot lights wire lights according to circuit

diagram on inside of cover. See special wiring instruction tag for

single switches with two pilot lights and dual switches with one

or more lights.

2 SPDT – Dual s

witching elements consist of two SPDT s

witches

mounted together in a bracket. Switches are calibrated to have

simultaneous operation within 1% of range either on increasing

or decreasing pressure b

ut not in both directions

Wire directly to

the front and rear switch according to circuit requirements.

Leads are provided on rear switch color coded as follows:

Common – White

Normally Closed – Red

Normally Open – Blue

See SPDT instructions for pilot light hook-up.

hen hermetically sealed switch elements(s) are supplied, the

ead color coding is as follows:

Common – White

Normally Closed – Red

Normally Open – Blue

B700 SERIES

SPDT

– Wire directly to the switch according to circuit requirements.

SPDT

–

Wire to front switch terminal block (left) and rear

witch terminal block (right) as marked. Strip insulation

⁄

16˝

nsert in proper terminal connector and tighten clamping screw

to secure.

ADJUSTMENT OF SETPOINT

B400 & B700 Series

– A single setpoint adjustment nut (

⁄

8˝) is

located centrally at the bottom on the inside of the enclosure.

For accurate setpoint calibration, mount the switch on a cali-

bration stand, a pump or catalog No.1305 deadweight gauge

tester. A suitable reference standard such as an Ashcroft

Duragauge or Test Gauge is necessary to observe convenient

changes in pressure.

As received, the pressure switch will normally be set to

approximately 90% of the indicated range.Pressurize the

system to required setpoint and turn the adjustment nut until

switch changes mode. Direction of turning is indicated on a label

affixed to the inside of the control enclosure.When setpoint has

been achieved raise and lower pressure to insure that setpoint

is correct.

After installation of the control replace cover to insure electri-

cal safety and to protect internal parts from the environment.

B450 and B750 VARIABLE DEADBAND SWITCHES

Deadband is varied by rotating the wheel on the precision

switch.When viewed from the front of the enclosure, rotation to

the left increases deadband – rotation to the right decreases

deadband. Letters on the wheel may be used as a reference.

Deadbands obtainable will vary from 0.5% to 9% of pressure

range depending on range segment and type of diaphragm.

ADJUSTMENT OF SETPOINT

As received, the pressure switch will normally be set to approxi-

mately 90% of range.Rotate the wheel on the MICRO SWITCH

all the w

y to the r

ight; this will provide smallest deadband.

Pressur

ize the system to the required setpoint and turn the

adjustment nut until the switch changes mode. Lower the

pressure to reset the switch.

Rotate the wheel on the MICR

SWITCH until the desired deadband is obtained.The upper

setpoint will be changing upward with this adjustment. Lower the

pressure to reset the switch.Then increase the pressure to the

desired setpoint and turn the adjusting nut until the switch

changes mode. Lower the pressure and check resetpoint and

deadband.

Note – As indicated above, adjustment of setpoint is made by

use of

⁄

8˝ n

ut.

Precision s

witch element mounting screws

and bracket adjusting screw are factory sealed and

should not be tampered with.

Installation and Maintenance Instructions for

B400 & B700 ASHCROFT

Snap Action

Switches for Pressure Control

TERMINAL BLOCK

SWITCH A

ERMINAL BLOCK

SWITCH B

Note – Since vacuum models are already above setpoint at

atmosphere

, the Nor

mally Open (NO) circuit will be

closed as received.

All sales subject to standard terms and conditions of sale. I&M009-10008-10/00 (250-2246E) AMR 1/07

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