Installation and Maintenance Instructions for
B700 ASHCROFT®Snap Action Switches
SIRA 02ATEX1391X; II 2GD; Ex d IIC T6 Gb;
Ex t IIIC T85° C Db IP 6X; (Ta = –20°C to +60°C)
NO (Normally Open) Blue
NC (Normally Closed) Red
C (Common) White
SPDT – Wire directly to the switch according to circuit
•
requirements.
• 2 SPDT – Wire to front switch terminal block (left) and rear
switch terminal block (right) as marked. Strip insulation
5
⁄
1
˝,
6
insert in proper terminal connector and tighten clamping
screw to secure.
8. Adjustment of Setpoint
Note – As indicated below, adjustment of setpoint is made by
7
use of
⁄
8˝ nut. Precision switch element mounting screws and
bracket adjusting screw are factory sealed and should not be
tampered with.
B700 Series – A single setpoint adjustment nut (7/8”) is located centrally at the bottom on the inside of the enclosure.
For accurate setpoint calibration, mount the switch on a calibration 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 electrical safety and to protect internal parts from the environment.
Note – Since vacuum models are already above setpoint at
atmosphere, the Normally Open (NO) circuit will be closed as
received.
D700 Series – A single setpoint adjustment nut (
7
⁄
8˝) is located
centrally at the bottom on the inside of the enclosure.
The direction of turning is indicated on a label affixed to the
inside of the control enclosure.
A typical calibration procedure would be as follows:
Static Working Pressure - 600 psig
Adjustable Differential Range - 5/200 psid
Differential Setpoint - 150 psi above static
working pressure.
Simultaneously raise the high and low side pressure to 600
psig. Maintain the low side pressure at 600 psig. Raise the
high side pressure to 750 psig to obtain 150 psi differential.
Turn the adjustment nut until the switch changes mode at 150
psi differential. When the setpoint has been achieved, raise
and lower the high side pressure to ensure that the differential
setpoint is correct.
D700 Series (low range differential) – A single setpoint
adjustment nut (
7
⁄
8˝) is located centrally at the bottom on the
inside of the enclosure.
The direction of turning is indicated on a label affixed to the
inside of the control enclosure. XG5 controls have a setpoint
indication scale adjacent to the adjustment nut. To adjust the
control, align the top of the adjustment nut hex with the indicator line on the scale. Do not force adjustment or attempt to
exceed the maximum setting shown on the scale or nameplate.
For accurate setpoint calibration or for controls without a scale
ount the control on a calibration stand so that the HIGH and
m
LOW pressures expected under operating conditions may be
obtained. Suitable reference standards are necessary for each
pressure.
Note – Due to the sensitivity of these controls it is imperative
that the LOW pressure side volume be large to prevent a set-
oint shift between calibration and field installation. If this is
p
not possible, an approximate setpoint under operating conditions can be obtained by setting the operating point with the
low side open to atmosphere. A final setpoint adjustment can
be made after installation.
Apply LOW pressure. Then apply HIGH pressure to the
required setpoint and turn the adjustment nut until the switch
operates. When the setpoint has been achieved, raise and
lower HIGH pressure to ensure that the differential pressure
between the HIGH and LOW pressures is correct.
After installation of the control, replace the cover to ensure
electrical safety and to protect the internal parts from the
environment.
T700 Series – A single setpoint adjustment nut (
7
⁄
8˝) is located
centrally at the bottom on the inside of the enclosure.
The bulb of the control should be immersed in a bath at the
desired setpoint temperature. Optimum performance will be
obtained if the bulb is fully immersed. Allow five minutes for initial stabilization.
As received, the temperature switch will normally be set to
approximately 90% of the indicated range. After stabilization,
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 jas been achieved raise and
lower temperature to insure that the setpoint is correct.
After installation of the control replace cover to insure electrical safety and to protect internal parts from the environment.
B750, D750 and T750 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 or temperature range depending on range segment
and type of diaphragm.
Adjustment of Setpoint – As received, the switch will normally be set to approximately 90% of range. Rotate the wheel on
the MICRO SWITCH all the way to the right; this will provide
smallest deadband. Pressurize, or increase bath temperature,
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.
© Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA, Tel: 203-378-8281, Fax; 203-385-0408, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M009-10120-10/02 ATEX Rev. 06/13
Installation and Maintenance Instructions for
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D
B700 ASHCROFT®Snap Action Switches
SIRA 02ATEX1391X; II 2GD; Ex d IIC T6 Gb;
Ex t IIIC T85° C Db IP 6X; (Ta = –20°C to +60°C)
Pressure switch – psi ranges
2.7 lb
(1.2 kg)
ABCDEFGHI J
53⁄4 57⁄32 43⁄8 35⁄8 37⁄8 25⁄16 17⁄325⁄16 331⁄32 115⁄16
146) (133) (111) (92) (98) (59) (31) (8) (101) (49)
(
Differential pressure switch –
psi differential ranges
Pressure switch –
inches of water ranges
.6 lb
3
1.6 kg)
(
BEGHI JKLMN
A
67⁄16 57⁄32 37⁄8 17⁄325⁄16 331⁄32 225⁄32 51⁄8 31⁄16 511⁄16 31⁄2
(164) (133) (98) (31) (8) (101) (71) (130) (78) (145) (89)
Differential pressure switch –
inches of water ranges
4.5 lb
(2.0 kg)
ABCDEFGHI O
725⁄32 57⁄32 43⁄8 35⁄8 37⁄8 25⁄16 17⁄325⁄16 331⁄32 311⁄16
(198) (133) (111) (92) (98) (59) (31) (8) (101) (94)
Temperature switch – direct mount
ABCDEFGHI JP
53⁄32 57⁄32 43⁄8 35⁄8 37⁄8 25⁄16 17⁄325⁄16 331⁄32 115⁄16 15⁄16
(129) (133) (111) (92) (99) (59) (31) (8) (101) (49) (33)
© Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA, Tel: 203-378-8281, Fax; 203-385-0408, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M009-10120-10/02 ATEX Rev. 06/13
3.7 lb
(1.7 kg)
ABCDEFGHI JQR
53⁄32 57⁄32 43⁄8 35⁄8 37⁄8 25⁄16 17⁄325⁄16 331⁄32 115⁄16 33
(129) (133) (111) (92) (99) (59) (31) (8) (101) (49) (76) (76)
3.6 lb
(1.6 kg)
ABEGHI JKLMN
67⁄16 57⁄32 37⁄8 17⁄325⁄16 331⁄32 225⁄32 51⁄8 31⁄16 511⁄16 31⁄2
(164) (133) (98) (31) (8) (101) (71) (130) (78) (145) (89)
Temperature switch – remote mount
4.5 lb
(2.0 kg)
Installation and Maintenance Instructions for
B700 ASHCROFT®Snap Action Switches
SIRA 02ATEX1391X; II 2GD; Ex d IIC T6 Gb;
Ex t IIIC T85° C Db IP 6X; (Ta = –20°C to +60°C)
© Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA, Tel: 203-378-8281, Fax; 203-385-0408, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M009-10120-10/02 ATEX Rev. 06/13
Installation and Maintenance Instructions for
TERMINAL BLOCK
FRONT SWITCH
TERMINAL BLOCK
REAR SWITCH
NC
NO
C
NC
NO
C
B700 ASHCROFT®Snap Action Switches
SIRA 02ATEX1391X; II 2GD; Ex d IIC T6 Gb;
Ex t IIIC T85° C Db IP 6X; (Ta = –20°C to +60°C)
1. Installation Requirements
• Ambient Temperature: –20 to 60°C
• Process Temperature: – 20 to 60°C
Other temperature limits are possible with different
diaphragm materials
• Refer to appropriate datasheet for materials of construction
and technical information.
• These controls are precision instruments and should never
be left with internal components exposed. During installation
nsure that covers are in place and conduit openings are
i
closed except when actually working on the control.
• To minimize the risk of injury, the control must be installed
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.
• Mounting position: Switch can be mounted in any position. It is
recommended that unit be set in intended operating poistion.
2. Cautions
• Always install the cover after wiring the switch and before
power is supplied.
• Before removing the cover in hazardous areas be sure there
6. 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 harden 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 personnel should check on the wiring, power supply and/or
mounting.
If the problem cannot be solved, please contact one of the
•
Dresser affiliates or distributors.
7. 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 connecting 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 and external ground screw
that must be connected.
• Micro switch terminals and wire color codes:
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 push any foreign objects (ex. Screwdrivers) against
the diaphragm.
• Do not exceed ranges, current and/or voltage limits.
3. Mounting
• Three holes external to the enclosure for surface mounting.
Location of these holes is shown in the general dimension
drawing.
• Units may also be mounted directly on the pressure line
using the pressure connection. When tightening control to
pressure line, always use the wrench flats or hex on the
lower housing.
4. Electrical Connections
• Before operating the switch all conduit entries and/or junction
boxes need to be closed according to the required safety and
electrical codes.
a) Standard product has two
permanent plug.
3
⁄
4 NPT conduit holes can be modified
3
⁄
4 NPT conduit holes with one
or reduced with ATEX approved adapters.
b) Available ATEX approved cable glands can be used.
• It is recommended that Teflon tape or other sealant be used
on conduit, bushing, gland or plug threads to ensure integrity
of the enclosure.
5. Cleaning
• Never use aggressive solvents.
• Do not use high-pressure water to clean the switch.
© Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA, Tel: 203-378-8281, Fax; 203-385-0408, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M009-10120-10/02 ATEX Rev. 06/13
TABLE 1: MICRO SWITCH ELECTRICAL RATINGS
MICRO SWITCH CODE ELECTRICAL RATING
Single Dual Single Dual Vac Vdc
K KK 20 61 15A, 250V 0.4A, 120V
W WW 21 65 5A, 250V
P PP 22 67 5A, 250V 2.5A, 28V
C N/A 23 N/A 22A, 250V
G GG 24 64 15A, 480V 0.25A, 250V
S N/A 25 N/A 10A, 250V 10A, 250V
F FF 26 62 15A, 250V 0.4A, 120V
Y YY 27 63 15A, 250V
U UU 28 N/A 15A, 250V
E EE 29 N/A 15A, 250V
M MM 31 70 1A, 250V 50mA, 60V
J JJ 32 68 11A, 250V 5A, 30V
L LL 42 71 1A, 125V
N/A N/A 50 N/A 15A, 250V
H HH 35 N/A 10A, 250V 0.3A, 250V
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