Installation and Maintenance Instructions for B400 & B700 ASHCROFT ® Snap Action Switches for Pressure Control INTRODUCTION The Ashcroft pressure switch is a precision built agency appr
Trang 2PRESSURE GAUGE INSTALLATION, OPERATION AND MAINTENANCE
PRESSURE SWITCHS PRESSURE GAUGE INSTALLATION, OPERATION AND MAINTENANCE
Trang 3Installation and Maintenance Instructions for
B400 & B700 ASHCROFT ® Snap Action
Switches for Pressure Control
INTRODUCTION
The Ashcroft pressure switch is a precision built agency
approved control device which features a mechanical snap
action switch Controllers are available for operation on pressure
or vacuum with fixed or variable differential Also manual reset
types for operation on increasing or decreasing pressure The
manual reset types remain tripped until reset by pressing a
but-ton on top of the enclosure Standard electrical switch is SPDT,
available with various electrical characteristics Two SPDT switch elements mounted together are available except on variable Deadband and manual reset types Various wetted material con-structions for compatibility with a range of pressure media may
be obtained.
The Ashcroft snap action pressure switch is furnished in the standard NEMA 4 and explosion-proof NEMA 7 & 9 enclosure styles Both enclosures are epoxy coated aluminum castings.
4.03 (102)
Ø 0.28 X 3 HOLES (7) 0.22
(6)
3.32
(83) 5.95
(151)
1.25
(32)
0.50
(13)
0.14
2.78 (71) 3.50 (89)
Ø 5.12 (130)
Ø 0.34
2 HOLES 0.36 (9)
0.25 (6)
2.27 (58) 1.25 (32)
2.77 (70)
5.62 (143)
3.06 (78)
2.84 3/4 NPT
1/4 NPT FEMALE
BRACKET WHEN REQURIED “XBP”
VARIATION
(72)
3.32 (84)
0.22 (6)
Ø 0.28 X 3 HOLES (7)
3.26 (83)
5.68 (144)
4.03 (102)
2.77 (70)
2.27 (58)
0.25 (6)
5.11 (130) 2.50 (64)
1.25 (32)
Ø 2.31 (59) 3/4 NPT B400
B700
5.20 (132)
3.62
(92)
2.18 (55) 0.32 (8)
4.37
(111)
1.37
(35)
Ø 0.28 x 3 HOLES
(7)
1.11
(28)
Ø 5.12 (130)
1.93 (49)
2.78 (71) 3.50 (89)
0.36 (9) 1.39 (35)
6.43
163
0.50
(13)
0.36
(9)
Ø 0.34 X 2 HOLES (9)
Ø 3.90 (99)
0.03 (1)
3.58 (91)
0.31 (8)
5.62 (143) 3.06 (78) 1.22 (31)
1/4 NPT FEMALE
3/4 NPT
2 HOLES
BRACKET WHEN REQUIRED "XBP"
VARIATION
1.93 (49)
5.20 (132)
3.62 (92)
2.18 (55)
0.32 (8)
4.37 (111)
1.37 (35)
5.73 (146)
Ø 0.28 x 3 HOLES (7)
Ø 3.90 (99)
0.03 (1)
3.58 (91)
2.31 (59)
0.31 (8)
1.22 (31)
1/4 NPT FEMALE 3/4 NPT 2 HOLES
1.8 lb (.81 kg)
2.7 lb (1.2 kg)
2.7 lb (1.2 kg) 3.6 lb
(1.6 kg)
STANDARD RANGES
15, 30, 60, 100, 200, 400, 600 psi
1000, 3000 psi 30˝Hg vac.-0
STANDARD RANGES
10, 30, 60, 100, 150 ˝H2O
15˝H2O vac.-15˝H2O
© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
Trang 4These 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.
Location of these holes is shown on the general dimension
drawing They may also be mounted directly on pressure line
using the pressure connection When 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.
permanent plug NEMA 7 & 9 enclosures require proper conduit
seals and breathers as per the National Electrical Code.
B400 SERIES
SPDT – Wire directly to the switch 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 switching elements consist of two SPDT switches
mounted together in a bracket Switches are calibrated to have
simultaneous operation within 1% of range either on increasing
or decreasing pressure but 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:
Normally Closed – Red
See SPDT instructions for pilot light hook-up.
When hermetically sealed switch elements(s) are supplied, the lead color coding is as follows:
Normally Closed – Red
B700 SERIES SPDT – Wire directly to the switch according to circuit requirements.
2 SPDT – Wire to front switch terminal block (left) and rear
insert in proper terminal connector and tighten clamping screw
to secure.
ADJUSTMENT OF SETPOINT
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 way to the right; this will provide smallest deadband Pressurize 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 MICRO 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
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
TERMINAL BLOCK SWITCH B
2
1 3
2
1 3
NC NO C
NC
NO
C
Note – Since vacuum models are already above setpoint at
atmosphere, the Normally Open (NO) circuit will be closed as received.
Trang 5INSTALLATION REQUIREMENTS
• To minimize the risk of injury, the switch enclosure must be
selected according to the area classification and installed
according to the required safety and electrical codes.
• Before operating the switch all conduit entries and/or junction
boxes need to be closed according to the required safety and
electrical codes.
• To attain the degree of protection listed on the switch it may
be necessary to add required conduit fittings.
• The switch must be protected from moisture, shock and/or
extreme vibration.
• The ambient temperature limits for switches are –20 to 150°F,
(–28 to 65°C).
CAUTIONS
• Always install the cover after wiring the switch and before
power is supplied.
• Before removing the cover in hazardous areas be sure there
is no explosive atmosphere present and the power supply is
turned off.
• For ATEX approved switches all safety locking devices and
electrical earthing must be installed or connected before
operating.
• Never carry a temperature switch by holding only the stem,
bulb or capillary.
• Do not exceed ranges, current and/or voltage limits.
• The protection degree of the switch is only valid when the
switch is installed in accordance with all safety and electrical
codes and regulations.
CLEANING
• Never use aggressive solvents.
• Do not use high pressure water to clean the switch.
MAINTENANCE/TROUBLESHOOTING
• All Ashcroft switches require little or no maintenance.
• Be sure that the case is closed at all times.
• When the switch is exposed to process media that may
hard-en and/or build up in the pressure port, the switch should be
removed and cleaned as needed.
• If the switch does not function, only trained and skilled
per-sonnel should check on the wiring, power supply and/or
mounting.
• If the problem can not be solved, please contact one of the
Ashcroft affiliates or distributors.
ELECTRICAL CONNECTIONS
• Only trained and skilled personnel are allowed to install the
wires to the electrical terminals of the switch.
• Cable couplers, glands and conduit connectors must have the
correct electrical approvals.
• Always follow safety and electrical regulations when
connect-ing these devices.
• The system ground of the device is marked with a green
colored screw and/or by the ground symbol.
• ATEX approved switches have an external ground screw that
must be connected.
• Micro switch terminals and wire color codes:
© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
Installation and Maintenance
Instructions for CE Mark on ASHCROFT®
Switches/Low Voltage Directive 73/23/EEC
TABLE 1: MICRO SWITCH ELECTRICAL RATINGS
Trang 6électriques
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en apte v
1) V=
Druck-/Differenzdruck- und Tempera- turschalter 400er und 700er Serie
Pressure-/differential pressure- and temperature sw
Instruction de Service Pressostat, pressostat différentielle et thermostat série 400 et 700 Ashcroft Instruments GmbH Germany
England/Angleterre Unit 5 William James House Cowley Road, Cambridge CB4 0WX
France/Frankreich „206“ ZA Le Mandinet Rue des Campanules
Trang 7n e
English 1 Installation
2 Mounting -
B/D/T450 and B/D/T750 h
5 Caution -
6 Cleaning -
7 -
Français 1 -
2 Montage -
Trang 8eau du mano est supérieure à la température
-20 … 60 °C Les températures max
remplis d’un bain d’huile amortisseur Température du "process" max
pression doit être amenée à la pression Fermer l’ensemble des v
tie basse pression a des fuites Si le la coté basse pression et ouv
sinon les ergots de la lunette pourraient être endommagés Pour retirer la lunette, tapoter dans
Faire tourner le bouton „B“ pour ajuster le zéro Serrer la v
Ausführung ex
liquid filled à bain
- 18 65 - 45 65
Pressure- and DP gauge Instruction de Service Manomètre et Manomètre différentiel Ashcroft Instruments GmbH Germany
England/Angleterre Unit 5 William James House Cowley Road, Cambridge CB4 0WX
France/Frankreich „206“ ZA Le Mandinet Rue des Campanules
Trang 9Betracht kommenden Anforderungen
stellung übereinstimmen Ohne Angabe auf dem Zifferblatt ist die Gebrauchslage 90°
plosionsfähiger Atmosphäre (Modell T5500/T6500): -20 … 60 °C
Bei gasförmigen Stoffen kann sich die Temperatur durch Kompres- sionsw
- Ventile innerhalb des Anzeigebereiches Fällt der Zeiger, ist die Plusleitung un- dicht oder das Ausgleichsv
stehen 6 Nullpunktkorrektur -
(1) gegen den Uhrzeigersinn lösen Nach der Nullpunktkorrektur Schr
fester Ausführung eine 1/8 Umdrehung, bei hermetisch dichter und gefüllter Ausführung eine 1/3 Umdrehung nachziehen
Gehäuseseite - (siehe Bild 2)
Feststellschraube A lösen Mit der Justierschraube B den Nullpunkt einstellen Feststellschraube A in Justierschraube B eindrehen
2 Mounting -
feature (liquid filled or pulsation dampener) The measuring instrument must be protect against damages, great pollution,
one-sided heat radiation for the dp gauge Please note the freezing point of media and choose a frost-protected place for the dp gauges
3 Operation - mark
-20 … 60 °C The admissible temperature of the process media depends on the instrument construction as w
For gaseous media the temperature can rise as result of compres- sion Therefore the max
and the pressure has to be released to atmosphere The pointer tip must stay w
5 Maintenance - -
Rotated knob B until required adjustment Tighten screw
2 Montage -
Noter la point de gel du fluide et choisir une place protégée du gel pour les ma- no’s différentiels
...liquid filled à bain
- 18 65 - 45 65
Pressure- and DP gauge Instruction de Service Manomètre et Manomètre différentiel Ashcroft... media the temperature can rise as result of compres- sion Therefore the max
and the pressure has to be released to atmosphere The pointer tip must stay w
5 Maintenance