Ashcroft P-N7 pressure switches - Manual

INSTALLATION 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:
NO (Normally Open) Blue
NC (Normally Closed) Red
C (Common) White
Ground Green (F-Series only)
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 6A, 30V
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, 125V 10A, 125V
F FF 26 62 15A, 250V 0.4V, 120V
Y YY 27 63 15A, 250V
U UU 28 N/A 15A, 250V 6A, 30V
E EE 29 N/A 15A, 250V 6A, 30V
M MM 31 70 1A, 125V 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 0.25A, 250V
© 2007 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M009-10030-10/00 (250-3136) AMR 5/07
Installation and Maintenance
Instructions for CE Mark on ASHCROFT
®
Switches/Low Voltage Directive 73/23/EEC
TABLE 1: MICRO SWITCH ELECTRICAL RATINGS