CMC Mid-West 140 User manual

BULLETIN NO. ELEC-IM140/11A
Replaces ELEC-IM140-141/09A
Instrument
Mid-West®
ELECTRICAL
Gauges with switches have one or two SPST or SPDT
hermetically sealed adjustable set point reed switch
assemblies. Resistive load ratings and capabilities for each
reed switch type are defined as follows:
Type SPST(Norm Open) SPDT
*Power 25 W 3W
Max. Current 0.5 Amps 0.25 Amps
Max. Voltage 240 VAC/VDC 125 VAC/VDC
Setting (F.S.) 15% to 90% 15% to 90%
Hysterisis
(Max/Nom)
15% / 8%
Full Scale(F.S.)
10% / 5%
Full
Scale(F.S.)
Repeatability 1% F.S. 1% F.S.
* Product of the switching voltage and current shall
not exceed the power rating of the device.
Provide standard protection techniques for the switch
contacts for capacitive and inductive loads. Use current
limiting techniques near the switch to protect the contacts
due to high inrush (i.e.; in line resistor or inductor) for long
cable interfaces. Provide clamping devices at or near
inductive loads (i.e.; relay). Long cable runs can be
considered both inductive and capacitive, therefore also
clamp across the switch. We recommend for long cable
runs of 70 feet or greater that you use the SPST switch or
use a current limiting resistor wired in series and located near
the switch. Contact the factory if you need assistance.
Please note that the SPST switch is available in only the
Normally Open configuration
Both switch types are field adjustable from 15% to 90% of full
scale reading of the gauge.. All switches come with a decal
to identify adjustment direction to increase the set point. To
set the switch at a desired set point on increasing pressure
apply pressure to the gauge for the desired set point. Adjust
the switch so that it is adjusted above the set point (normally
open contacts are open) and slowly decrease the set point
until the switch activates (normally open contact closes).
Remove pressure and slowly reapply to determine the actual
setting. This process can be repeated to achieve a more
accurate setting.
All switch functionalities shown are with the gauge at 0 PSID.
The SPST switches are available in the Normally Open
configuration only.
Use the Mid-West Power Relay 1000TR or equivalent relay
for loads above the switch rating.
The following warnings apply to all gauge options with
electrical interface.
WARNING: ELECTRICAL CONNECTIONS SHOULD
BE PERFORMED BY QUALIFIED
PERSONNEL AND MEET THE
REPRESENTATIVE COUNTRY'S
NATIONAL ELECTRICAL CODE.
WARNING: FAILURE TO CONNECT TO THE
PROTECTIVE CONDUCTOR TERMINAL
MAY RESULT IN A SHOCK HAZARD.
WARNING: REMOVAL OR REPLACEMENT OF
INSTRUMENT HARDWARE VOIDS ALL
WARRANTIES AND CONFORMANCES TO
ANY STANDARDS (EXCEPT COVERS
AND OR SWITCH ADJUST PLUGS).
NEMA 4X (Plastic Weatherproof Enclosure)
(A & B options)
The reed switch(es) are located inside the enclosure, on the
top of the pressure housing, and are connected to a 7
position terminal strip. An opening is provided at the rear
of the enclosure for a 1/2" flexible weather-proof cable or
conduit connector (supplied by customer). Upon request the
hole may be sized to accommodate a PG-11 cable gland
connector.
Remove the switch enclosure cover by removing the (4)
screws. Insert wires through an appropriate (not supplied)
weatherproof connector into the enclosure and connect to
the terminal strip per the terminal strip diagram shown below
or on the underside of the switch enclosure cover. The
center connection is for connection of a protective conductor
and is connected to the body of the pressure gauge.
The terminal strip will accept wires in the range of 22 Awg -
16 Awg.. Reinstall the cover, gasket, and (4) screws. (Fig.
3) after connection of field wiring.
Wiring for the SPST switches is connected between NO and
CM connections on the terminal strip. Normally closed
switches are not available.
Access holes and plugs are provided for external adjustment
of the switches if required.
Gauge
Front NO NC CM CM NC NO
SINGLE DOUBLE
Model 140 Electrical
Installation and Operating Instructions
CMC TECHNOLOGIES
PTY LIMITED ACN: 47 085 991 224 ABN: 47 085 991 224
Phone: [phone] Unit 19, 77 Bourke Rd
Engineering & Fax: [phone] Alexandria
Industrial Email: [email protected] NSW 2015
Instrumentation Website: www.cmctechnologies.com.au AUSTRALIA

Division II Hazardous Ratings (E ,F, & W) options):
The E, F, & W Electrical Configurations are 3rd party certified
to both Canadian and U.S. standards for Class I, Division II,
Groups A, B, C, & D, Class II, Groups F & G hazardous
environments
Interface is identical to the plastic weatherproof enclosure
with the exception of a ½” FNPT conduit interface.
NEMA 7 (Explosion-proof ) Enclosure
(C & D options)
WARNING: THE COVER AND/OR SWITCH ADJUST
ACCESS PLUGS MUST NEVER BE REMOVED WHEN
THERE IS POWER TO THE UNIT. MAKE ALL
ADJUSTMENTS IN A NONHAZARDOUS AREA.
The gauge and switches are mounted inside the enclosure.
A 1/2"-14 FNPT conduit connection is provided in the bottom
side of the enclosure. A proper explosion proof, dust tight
sealing fitting with appropriate sealing cement must be used
when making connections to the 24", 18 Awg. wire leads.
Adjustment of the set point can be accomplished by removing
the switch adjustment access plug(s). Insert the screw driver
through the hole into the switch adjustment slot and rotate
until the desired set point is reached. A clockwise rotation
will increase the set point for the right side switch access
and a clockwise rotation will decrease the set point for left
switch access. Do not use excessive force. Reinstall the
access plugs for 5 full threads of engagement after
completion.
SPDT Switch leads are color coded and labeled as follows:
White- 1 or 2 Com (1 Right Access 2 Left Access)
Black- 1 or 2 NC
Red - 1 or 2 NO
SPST Switch leads are black in color and are labeled:
1 or 2 Com (1 Right Access 2 Left Access)
1 or 2 NO
A green / yellow wire is provided for proper electrical bonding
of the enclosure chassis.
Enclosures with SPDT and SPST switches comply with NEC
Class 1, Groups C & D, Class 2 Groups E, F, & G, NEMA 7 &
9, and are CSA & UL listed.
Transmitter Option: (T & W ) Electrical Configuration)
The Model 140/141 Transmitter is intended for use in
General Purpose Locations (T electrical configuration) or
Division 2 locations (W electrical configuration). In both
cases the enclosure carries a NEMA 4X IP65 environmental
rating.
The transmitter assembly as a component has passed
numerous European EMC standards (ie; Compliance to IEC
EN61326). Contact the factory if additional low pass filtering
is necessary.
The Model 140/141 indicating / non-indicating differential
pressure transmitter is a 2 wire loop powered microprocessor
based 4-20 ma transmitter. The magnetic angle sensor &
electronics senses the angle (relative to the transmitter
sensor) of the magnet which moves linearly in the bore.
Each transmitter is individually calibrated to the gauge using
an 11 point calibration linearization technique. This method
results in a <2% full scale accuracy for the upper 80% of the
range.
In addition, an external zero pin is available for simple
remote zeroing (instead of supplied local zero) after
installation.
Caution:
Do not attempt to reposition the transmitter assembly
within the enclosure. This voids the warranty and will
“knock” the unit out of calibration. Disassembly and re-
assembly of any internal process parts will also require
the unit to be re-calibrated. Calibration must be
performed at the factory.
The weather-proof enclosure comes standard with a ½”
FNPT conduit interface. Internal to the enclosure is a 4
position terminal strip. The terminal strip accepts wire sizes
22 AWG – 16 AWG. Connections are defined in Figure 4.
Zero Return
8-28 Vdc
Zero Switch
Figure 4
CMC TECHNOLOGIES
PTY LIMITED ACN: 47 085 991 224 ABN: 47 085 991 224
Phone: [phone] Unit 19, 77 Bourke Rd
Engineering & Fax: [phone] Alexandria
Industrial Email: [email protected] NSW 2015
Instrumentation Website: www.cmctechnologies.com.au AUSTRALIA

Connect loop power between the connections labeled
8-28 Vdc and RTN. Connect the protective conductor
wire to the terminal with the symbol. A zero
pushbutton is also included. Zero the transmitter
with the transmitter powered and no differential
pressure applied by depressing the switch for a
minimum of 2 seconds.
The maximum loop resistance is 1000 ohms (@
28Vdc Input). Use the following formula to
determine the maximum loop resistance at other
input voltages:
((Vs – 8) *1000)/ 20
The interface schematic shows an implementation of
the Remote Zero function. The supplied unit
incorporates an internal pushbutton for zeroing the
unit locally (non-hazardous locations only "T"
electrical configuration).
Occasionally the transmitter may require a “re-zero” .
The “re-zero” may be necessary due to stray
magnetic fields or a large change in temperature
from when the unit was originally calibrated.
Warning: If zeroing in the Hazardous Location
environment use a switch approved for that
location.
Occasionally the transmitter may require a “re-zero” .
The “re-zero” may be necessary due to stray
magnetic fields or a change in temperature from
when the unit was originally calibrated.
Trouble Shooting
1. Switch doesn't function. (Assuming Indication is good)
i. Make sure that the switch load does not exceed the
specified wattage rating of the switch. (steady-
state and transient). Contact factory for assistance
for excessive loads, otherwise proceed to the next
step.
ii. Perform a continuity check of the switch contacts
by trying to actuate the switch using an external
magnet. An operational switch usually indicates a
problem with the gauge. If not operational proceed
to the next step.
iii. Verify the reed switch wires are connected to the
terminal strip (NEMA 4X enclosure only). Contact
the factory for assistance if the switch is connected
and/or request an "RGA" number.
2. Transmitter doesn't function
A. Make sure you have supplied power (proper
voltage) to the unit.
B. Check that you are wiring to the correct
Interface terminals.
C. Check the transmitter interfaces to the terminal
board for loose connections.
D. Make sure that the loop resistance does not
exceed the specified rating.
3. Gauge accuracy and set point problems:
i. Verify gauge is not in an electromagnetic /
magnetic environment. i.e.; close proximity to high
current power lines.
ii. All others, contact the factory for assistance.
4. When contacting the factory please have the following
information available if possible:
1. Gauge / Switch Serial Number
2. Model Number of the Gauge / Switch
3. Description of the problem and events prior to
failure.
4. Interface Information such as switching voltage,
switching current, cable lengths, etc.
RLoo
p
To Transmitter
8-28 Vdc Pin 3
To Transmitter
GND Pin 1
Interface Schematic
8-28Vdc To Transmitter
Zero Pin 2
4-20 ma
3
2
1
DP Transmitter
Customer Interface
1
2
3
1 Zero switch not present for hazardous locations product
2 Optional remote zero (customer supplied)
3 Loop Resistor can be located in the ground leg
CMC TECHNOLOGIES
PTY LIMITED ACN: 47 085 991 224 ABN: 47 085 991 224
Phone: [phone] Unit 19, 77 Bourke Rd
Engineering & Fax: [phone] Alexandria
Industrial Email: [email protected] NSW 2015
Instrumentation Website: www.cmctechnologies.com.au AUSTRALIA

TRANSMITTER SPECIFICATIONS:
Transmitter Dimensional
Transmitter Specifications: (Calibrated on Increasing pressure) Comments:
Differential Pressure Range 0-50” H2O to 0 -100 PSID
Leakage None Hi to Lo
Pressure (Ratings)
Max Working See Specifications
Gauge Accuracy 2% ASME B40.100 GRADE B
Operating Temperature (Max.) -20F - 150F
ELECTRICAL:
Min Typ Max
Transmitter Accuracy (FSR) 2% Upper 80% of Full Scale
Range
Supply Voltage (3) (Vdc) 8 28 Pin 3 Reverse Polarity
Protected
Output Current (ma)
Zero Floating (2) 4.0 – 20.1 ma 4.0 – 21.0 4.0 – 22.0 Pin 2
Zeroed (1 connected to 2) 8
Voltage (Pin 2 to 1) 4.8 6.3
Zero Time (seconds) 2
Max Loop Resistance (ohms) 1000
Max Loop Resistance Formula ((Vs – 8)*1000)/ 20
INTERFACE:
Electrical:
Connections: 4 Position Terminal Strip; ½” NPT Conduit
1= Rtn, 2= Zero, 3 = 8-28 Vdc In 4= Chassis
22 Awg – 16Awg Wire
Environmental Rating: NEMA 4X
Certifications: CSA (Canadian & US Standards; Division 2 Locations)
Electrical Configuration: T or W
Model 140/141 End Connected
With Transmitter 2 ½” Dial
Electrical Configuration: T or W
Model 140/141 End Connected
With Transmitter 4 ½” Dial
W option= Class I, Div. 2, Groups A, B, C,D
Class II
,
Div 2
,
Grou
p
s F & G
CMC TECHNOLOGIES
PTY LIMITED ACN: 47 085 991 224 ABN: 47 085 991 224
Phone: [phone] Unit 19, 77 Bourke Rd
Engineering & Fax: [phone] Alexandria
Industrial Email: [email protected] NSW 2015
Instrumentation Website: www.cmctechnologies.com.au AUSTRALIA

Electrical Configuration: C or D
Explosion-Proof Enclosures Class I, Groups C & D
Class II, Groups E, F, & G Dial Size
DIM 2 ½ 2 ½ 4 ½
A 7.12
(180.9)
6.53
(163.3)
8.50
(215.9)
B 4.15
(105.4)
2.12
(53.84)
2.50
(62.5)
C 3.15
(80.01)
3.12
(79.24)
4.35
(110.5)
D 6.00
(152.4)
6.56
(166.6)
6.25
(158.8)
E 8.75
(222.2)
7.75
(196.9)
9.12
(231.6)
F 7.35
(186.7)
6.68
(169.7)
7.75
(196.9)
G 3.80
(96.52)
3.80
(96.52)
3.80
(96.52)
H 8.12
(206.3)
7.43
(188.7)
7.75
(196.9)
Electrical Configuration: A or B
NEMA 4X 2 ½ INCH DIAL
Electrical Configuration: A or B
NEMA 4X 4 ½ INCH DIAL
Electrical Configuration: E or F
NEMA 4X METAL ENCLOSURE
Class I, Div. 2, Groups A, B, C,D
Class II, Div 2, Groups F & G
CMC TECHNOLOGIES
PTY LIMITED ACN: 47 085 991 224 ABN: 47 085 991 224
Phone: [phone] Unit 19, 77 Bourke Rd
Engineering & Fax: [phone] Alexandria
Industrial Email: [email protected] NSW 2015
Instrumentation Website: www.cmctechnologies.com.au AUSTRALIA

BULLETIN NO. ELEC-IM140/11A
Replaces ELEC-IM140-141/09A
Instrument
Mid-West®
CE Marking Statements:
The Electrical Configurations A,B, E, & F of this product are CE marked in compliance with the Low Voltage Directive to EN-61010-1.
These products shall not be placed in an Explosive atmosphere as defined by the ATEX Directive 94/9/EC except if evaluated to be “Simple
Apparatus”.
They may be classified as simple apparatus. However, the evaluation to the relevant portions of the applicable standards and clearly
identifying the product as simple apparatus shall be the responsibility of the end user.
The Pressure Equipment Directive has been determined to be non applicable for CE marking. These products are manufactured in accordance
with article 3, paragraph 3 of the directive, “sound engineering practice”. They fall below category I for non-hazardous gases, hazardous liquids,
& non-hazardous liquids. This product also falls below category I for hazardous gases at or below 200 bar.
Simple Apparatus NEC 504.2
The A, B, E, & F Electrical configurations of this product meet the simple apparatus definition as defined in NEC 504.2 of Article 504
(Intrinsically Safe Systems). Because of this classification, equipment listing is not required (504.4) and ordinary wiring methods shall be
permitted (504.20). Proper installation of this product in a hazardous location to the applicable requirements is the responsibility of the end user /
equipment installer.
EMC Directive:
The transmitter design has been evaluated to and passed the following “EN” Standards as they relate to the EMC directive. However, the
units are not CE marked for compliance to the EMC directive.
IEC EN61326:1997 Environment Industrial, Electrical Equipment for measurement, Control and Laboratory use,
EMCrequirements from which:
EN55011:1998Emission standard for Industrial, Scientific and Medical Equipment, Class A
EN61000-4-2:1995 Electrostatic discharge (ESD) immunity
EN61000-4-3:1996 Radiated EM field immunity
ENV50204:1995 Radiated EM field immunity from digital telephones (GSM)
EN61000-4-4:199 5Electrical fast transient (EFT) immunity
EN61000-4-5:1995 Surge immunity
EN61000-4-6:1996RF conducted immunity
EN61000-4-8:1993 Power Frequency magnetic field
Warning: The suitability of the application and installation of this differential pressure switch / transmitter is the
responsibility of the end user. The applicable certifications, listings apply to the differential
pressure switch / transmitter only.
Mid-West
Instrument
6500 Dobry Dr. Sterling Heights, MI 48314
[phone] FAX [phone]
E-Mail: [email protected]
Web Page: www.midwestinstrument.com
PROOF PRESSURE: 2X Working Pressure Warranty: 5 Years Transmitter (1 Year)
WORKING PRESSURE: 3,000 PSI (AL, SS) 1500 PSI (Brass)
TEMPERATURE LIMITS: -40F to + 200F(Switch Options); -20F TO + 150F (Transmitter Option)
These limits are based on the entire instrument being saturated to these temperatures. System (process) temperatures may exceed
these limitations with proper installation. Contact our customer service representative for details.
CMC TECHNOLOGIES
PTY LIMITED ACN: 47 085 991 224 ABN: 47 085 991 224
Phone: [phone] Unit 19, 77 Bourke Rd
Engineering & Fax: [phone] Alexandria
Industrial Email: [email protected] NSW 2015
Instrumentation Website: www.cmctechnologies.com.au AUSTRALIA