ITT NEO-DYN 182P Manual de usuario
NEO-DYN
MODEL 182P,
ADJUSTABLE VACUUM SWITCHES,
ENCLOSURE 6N FOR EXPLOSIVE ATMOSPHERES AND
ENCLOSURE 3X FOR WEATHER PROOF APPLICATIONS
INSTALLATION AND
OPERATION MANUAL
PN 610-0021
Rev. C
Enclosure 6N Pressure Switches Page i
WARNING
CAUTION
NOTE
Manual No. 610-0021 Rev C
Neo-Dyn
28150 Industry Drive
Valencia, CA 91355
Tel: (661) 295-4000
Fax: (661) 294-1750
World Wide Web: www.neodyn.com
Copyright 2002
ITT Industries
Important Information
The product warranty applicable to this ITT Neo-Dyn®instrument
is as stated on page 13 of this manual.
Should any after-delivery problems arise, please contact
ITT Neo-Dyn’s Customer Service using the information above.
Our normal business hours are weekdays, 7:00 am to 3:30 PM,
Pacific Time.
Before installing this Vacuum Switch, become familiar with the
installation and adjustment instructions in Chapters 2 and 3.
Indicates a hazard which can cause severe personal injury,
death, or substantial property damage if the warning is
ignored.
Indicates a hazard which will or can cause minor personal injury
or property damage if the caution is ignored.
The Electrical Snap Switch Assemblies shall be installed such that
the equipment wiring is protected from mechanical damage by the
use of metal conduit or a method providing equivalent protection.
The equipment wiring must not be subjected to tension or torque.
If it is to be terminated within a potentially explosive atmosphere,
a suitably certified termination facility must be used.
Indicates additional information about a particular item necessary
to the operation of the unit.
This document contains proprietary information, which is the
property of Neo-Dyn, a unit of ITT Industries. This document
may not be reproduced, either in part or in full, without the
consent of ITT Industries.
SPECIAL
CONDITIONS
FOR SAFE USE
Enclosure 6N Pressure Switches Page ii
TABLE OF CONTENTS PAGE
CHAPTER 1 INTRODUCTION.................................................1
CUSTOMER SERVICE............................................................2
OTHER CONFIGURATIONS..................................................2
CHAPTER 2 INSTALLATION..................................................3
MOUNTING AND PROCESS CONNECTION.......................3
PROCESS MEDIA....................................................................3
POTENTIALLY EXPLOSIVE ATMOSPHERES......................
(HAZARDOUS LOCATIONS) ENCLOSURE 6N ONLY......4
ELECTRICAL CONNECTIONS..............................................5
CHAPTER 3 ADJUSTMENTS 6
CHAPTER 4 TROUBLESHOOTING ..........................................7
CHAPTER 5 SPECIFICATIONS................................................9
STANDARD .............................................................................9
WETTED MATERIALS AND ENCLOSURE 10
OPTIONS................................................................................10
LISTING AGENCIES 11
PRESSURE RATINGS 11
WEATHER PROOF RATINGS 11
TEMPERATURE RANGES FOR PROCESS MEDIA 11
ELECTRICAL AND AMBIENT TEMPERATUE RATINGS 12
WARRANTY INFORMATION.................................................13
Enclosure 6N Pressure Switches Page 1
CHAPTER
1
INTRODUCTION
The Neo-Dyn®Switches described in this manual are weather -
proof, electromechanical sensing devices designed for a wide
range of applications in pneumatic and hydraulic systems up to
150 psig. The Enclosure 6N Switches are for use in Zone 1
Potentially Explosive Atmospheres (Division 1 hazardous
locations).
The wetted material for these Vacuum Switches include a
polyimide (Kapton) sensing diaphragm, nitrile O-ring, corrosion
resistant steel (CRES) helical spring and aluminum alloy or CRES
pressure port. Viton or EPR O-rings are also available.
Set points are easily adjusted by turning an adjustment screw
located inside the pressure port. This is discussed further in
Chapter 3.
The standard configuration of these switches will switch up to 11 amp
at 125 or 250 VAC, 5 amp resistive at 28 VDC, or 0.5 amp
resistive at 125 VDC. When ordered with M Option, the switch is
rated for currents to 1 amp, but its bifurcated gold contacts will
reliably switch currents in the milliampere and microampere ranges.
These switches have CE Mark, with weatherproof enclosure,
IP 66 ingress protection that meet the requirements of NEMA 3.
3R, 3S, 4, 4X and 13.
The Enclosure 6 electrical subassemblies are approved by
Underwriters Laboratories, CSA International and Factory Mutual
as well as having SIRA approval for ATEX certification.
Enclosure 6N Pressure Switches Page 2
WARNING
Figure 1
182P Vacuum Switch
CUSTOMER SERVICE
If you have any questions about these Vacuum Switches that are
not covered in this manual, you can contact Neo-Dyn or our
representatives in several ways.
The Neo-Dyn customer service phone number is
(661) 295-4000. Our customer service department is open
from 7:00 am to 3:30 p.m. Pacific Time.
Our Internet site is www.neodyn.com; it includes lists of
sales representatives and distributors.
OTHER CONFIGURATIONS
The models described in this manual are also available in special
and factory-set configurations. For these units, follow the
installation and operating instructions herein, except adhere to
the pressure and electrical limits marked on the units.
WARNING
WARNING
WARNING
WARNING
CAUTION
WARNING
CHAPTER
2
INSTALLATION
Installation of these Neo-Dyn®Vacuum Switches is
straightforward. However, they must be installed by a qualified
electrician, in compliance with all local and national electrical
codes.
Electrical Hazard
Do not make electrical connections while power is on.
Always check for multiple circuits.
Always make sure grounding is adequate.
MOUNTING AND PROCESS CONNECTION
The switch is mounted directly to the process connection.
The switch’s process connection is ¼” - 18 NPT male.
When installing the Vacuum Switch, always:
Make sure that the unit and your system have matching threads.
Use the wrench flats provided.
Seal all joints with pipe-joint sealing compound.
Avoid excessive torque on all threaded connections.
Do not exceed the marked Maximum Operating Pressure in
normal operation.
The marked Proof Pressure is provided to give the maximum
allowable pressure without causing permanent damage to the
pressure switch in the event of an over-pressure condition. Set
pressure relief/safety valves below this setting.
PROCESS MEDIA
Process media must be compatible with the wetted materials listed
in Chapter 5 on page 10. Compatibility is defined by an “A”
rating in the Chemical Resistance Guide for Metals and Alloys,
the Chemical Resistance Guide for Plastics, and the Chemical
Resistance Guide for Elastomers, all published by Compass
Publications, and available from the National Association of
Corrosion Engineers (NACE), Houston, Texas; telephone
(281) 228-6200.
POTENTIALLY EXPLOSIVE ATMOSPHERES
(HAZARDOUS LOCATIONS) ENCLOSURE 6N ONLY
Suitable for Zone 1, Ex d IIC explosive atmospheres, in
accordance with Potentially Explosive Atmospheres Directive
94/9/EC.
Suitable for Division 1; Class 1, Groups A, B, C and D; Class II,
Groups E, F and G hazardous locations, in accordance with the
National Electric Code (NEC), and applicable UL, FM and CSA
specifications.
WARNING
ELECTRICAL CONNECTIONS
18 AWG free leads 18 in (46 cm) long are standard, with a green
wire grounded to the case. 72 inch (183 cm) leads are available as
R Option, and other lead lengths may be ordered as special
configurations. The leads are intended for installation in conduit
capable of withstanding possible explosion pressures, and the
leads are factory sealed. See Figure 2 below for color codes.
All field wiring must comply with requirements of the NEC or
applicable local or national electrical codes, including wire
gauges and insulation temperature ratings. Conduit seals may
be required.
Figure 2.
Pressure Switch Schematics Shown above Zero PSIG
INC INC
VAC VAC
RED
BRN
BLU
BLK
Y
EL
VIO
GRN
RED
BRN
BLU
GRN
FORM CC FORM C
CHAPTER
3
ADJUSTMENTS
SET POINT ADJUSTMENT
The factory-set set point or adjustable set point range is marked
on the face of the switch. This section describes the adjustments
needed after an Adjustable Vacuum Switch has been properly
installed.
1. Disconnect the electrical power. Check for multiple circuits.
2. Remove the pressure connection to allow access to the
adjustment nut inside the pressure port.
3. To change the set point use a 3/32 Allen wrench to rotate the
adjustment nut clockwise to increase the vacuum set point,
and counterclockwise to decrease it. It takes approximately 3
to 5 turns to move from one end of the adjustable range to the
other. Check the set points per paragraphs 4 and 5 below for
precise adjustments.
4. To check the increasing vacuum set point, connect a vacuum
source and a calibrated pressure gauge or transducer to the
pressure port and slowly apply increasing vacuum until the
switch actuates. Actuation can be noted by listening to the
audible snap of the Belleville spring, or with an ohmmeter
across the appropriate free leads.
5. If you want to check the decreasing vacuum set point, slowly
decrease the vacuum after the switch has actuated and note
the value at which the audible snap or an ohmmeter indicates
deactuation. Deadband may be calculated if desired by
subtracting the increasing set point reading from the
decreasing set point reading.
4
TROUBLESHOOTING
TROUBLESHOOTING
In-service problems are unlikely, but the following paragraphs
suggest ways to verify any problems that might arise:
1. Vacuum Switch Leaks
If a leak is suspected, isolate the Vacuum Switch from the
rest of the system. Connect the switch and a calibrated
pressure gauge downstream from a pressure source and
shutoff valve. Apply normal system pressure, isolate the
gauge and Vacuum Switch from the pressure source with the
shutoff valve for at least one minute, and check for leaks as
evidenced by a drop in the gauge reading.
If a leak is verified, return the unit for repair. Contact ITT
directly, or your local sales representative or distributor (see
www.neodyn.com for a contact list).
2. Failure to Switch
If application of vacuum 10% greater than the adjusted set
point fails to produce actuation, first check for contamination
in the process connection, and verify that the expected
pressure is reaching the sensing diaphragm or piston.
If the Belleville spring can be heard to audibly snap, but an
ohmmeter indicates no electrical switching, the cause is
probably stuck or burned switch contacts, or the switch
element has moved away from the position where it was
synchronized with the snap action. Return theunitfor repair.
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