MidWest_121_DifferentialPressureIndicator

MidWest_121_DifferentialPressureIndicator
BULLETIN NO. 121/11
(SUPERSEDES BULLETIN NO. 121/06)
®
Mid-West Instrument
“Piston Type” Model 121
Differential Pressure Switch & Transmitter
A low cost differential pressure indicating switch or transmitter for use in measuring the pressure drop
across filters, strainers, separators, valves, pumps, chillers etc., and for local flow indication and control.
• ½ NPT conduit connection with heavy duty Switch or Transmitter
cover and terminal strip
• Choice of 1 or 2 magnetically actuated hermetically sealed reed switches
to provide high and low limit alarm or control or 4-20mA transmitter.
• Transmitter accuracy ± 2% full scale (from 20% to 100% of scale, ascending)
• Body materials: Aluminum or 316L Stainless Steel
with 316 stainless steel internals.
Transmitter now
• Weather-resistant construction standard.
CSA Listed for
• Working pressure up to 6,000 PSIG (400 bar)
Division
2 Hazardous
• Over-range protection to maximum pressure.
Location
Service
• Shatter resistant acrylic lens.
• Variety of Dial type and Sizes: 2-1/2”, 3-1/2” & 4-1/2”
• Available DP Ranges: Inches H2O, PSID, bar, and Kpa
• Temperature Limits:
-40°F (-40°C) to +200°F (+93°C) (Switch Options)
-20° F to + 150° F (Transmitter Option)
Model 121 0-75 PSID
2-1/2” Dial. Shown with
End Connections & Transmitter
Model 121 Switch
¼” FNPT back
connections
Model 121
0-50 PSID 4-1/2” Dial
& Transmitter
Model
Body
Material
Gauge
Accuracy
Min. ΔP
Range
Max. ΔP
Range
MWP
PSIG (Bar)
Switch Options
121
Aluminum &
316L S.S.
±2%
0-5 PSID
(0-0.35 bar)
0-100 PSID
(0-7 bar)
ALM. = 3,000 (200)
S.S. = 6,000 (400)
1 or 2 switches or
4-20mA Transmitter
Model 121 Indicating Switch(es) or 4-20mA Transmitter SPECIFICATIONS
TRANSMITTER
Features:
Microprocessor based, external zero interface:
8-28 Vdc loop powered, 2 wire interface
Electrical:
Accuracy
Supply Voltage
Output
Max Loop Resistance
SWITCHES
Features:
1 or 2 hermetically sealed reed switches
Electrical:
0-3W, 25 Amp
125 VAC (Adjustable 15-95% F.S.)
60W, 3.0 Amp
240 VAC (Adjustable 20-95% F.S.)
±2% (from 20% to 100% of scale, ascending)
8-28 Vdc
4-20mA
1000 Ohms
Interface:
4 position terminal strip for 16-22 Awg wire
Pin 1 – return, Pin 2 = zero, Pin 3 = 8-28 Vdc, Pin 4-chassis
1/2” NPT conduit connection
Interface:
7 position terminal strip for 16-22 Awg wire
1/2“ NPT conduit connection
Environmental: Weatherproof
Environmental: Weatherproof
Rating:
Rating:
(NEMA 4X, IP65)
(NEMA 4X, IP65)
“Piston Type”
Differential Pressure
Switch & Transmitter Options
Model 121
Open back view
Model 121 reed switch
with terminal strip
Model 121 Transmitter show
with NEMA 4X plastic cover
Open view Model 121 Transmitter
4-20 mA terminal strip
w/ ¼” FNPT end connections
Piston-Type Differential Pressure Gauges are available with one or two hermetically sealed reed switches. The
switches are adjustable within a defined percentage of the full scale range of the gauge and are available in SPDT
and SPST, normally open or normally closed configurations for various load/power ratings. The switches can be set
to activate or deactivate on rising or falling pressure. Switches are "CE" marked per the EU low voltage directive.
Models 121 can be configured for use in Hazardous Locations.
Piston Type DP Gauge: ± 2% Full Scale Accuracy. They are primarily designed for liquid applications. They exhibit a
slight amount of bypass as the fluid crosses from the high to the low pressure port. Because gas molecules are
smaller, the crossover is often deemed too great for the application. Due to precision sizing of piston and body bore,
leakage across the piston will not exceed 15 SCFH air at 100 PSID at ambient conditions.
Available Electrical Configurations (CE marked, except E, F, J & K)
One (1) Reed switch in NEMA 4X/IP65 Plastic enclosure with terminal strip (1/2” FNPT Conduit Connection)
Two (2) Reed switches in NEMA 4X/IP65 Plastic enclosure with terminal strip (1/2” FNPT Conduit Connection)
One (1) Switch in general purpose enclosure, Division 2 Hazardous Locations (1) (2)
Two (2) Switches in general purpose enclosure, Division 2 Hazardous Locations (1) (2)
4-20 mA Transmitter in NEMA 4X/IP65 Plastic enclosure with terminal strip
(1/2” FNPT Conduit Connection) (3)
4-20 mA Transmitter in NEMA 4X/IP65 Plastic enclosure. Division 2 Hazardous Locations with terminal strip
(1/2” FNPT Conduit Connection) (1) (2) (3)
(1) Complete assembly 3rd Party Certified Class I, Div.2, Groups A, B, C, & D; Class II, Div.2, Groups F and G.
(2) 5000 PSIG SWP for Stainless Steel: 3000 PSIG SWP for Aluminum
(3) Contact factory for flow applications with transmitter configuration
Available Electrical Specifications (For Resistive Loads)
SPDT 3W, 0.25 Amp, 125 VAC/VDC (standard) (Switch adjustable range of 15-95%)
SPST 60W, 3.0 Amp, 240 VAC/VDC (Normally Open) (Switch adjustable range of 20-95%)
SPST 60W, 3.0 Amp, 240 VAC/VDC (Normally Closed) (Switch adjustable range of 20-95%)
SPST 60W, 3.0 Amp, 240 VAC/VDC (1) Normally Open, (1) Normally Closed (Switch adjustable range of 20-95%)
4-20 mA Transmitter (8-28 VDC Loop Power) ( ±2% accuracy from 20% to 100% of scale. Ascending)
Proof Pressure: Two times rated working pressure at ambient temperature.
Temperature Limits:
Switch Options: -40°F to + 200°F
Transmitter Options: -20° F TO + 150° F
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.
Standards: Model 121 Gauge either conforms to and/or is designed to the requirements of the following standards:
ASME B1.20.1
NACE MR0175
ASME B40.100
NEMA Std. No. 250
CSA-C22.2 No. 14.25 and 30
SAE J514
EN-61010-1
UL Std. No. 50,508 and 1203
6500 Dobry Dr. • Sterling Heights, MI 48314 USA • Tel: 800-648-5778 Tel: 586-254-6500 Fax: 586-254-6509
Web Site: www.midwestinstrument.com • Email: sales@midwestinstrument.com
®
Mid-West Instrument
Standard Dial Ranges: Model 121
PSID
0-5 PSID
0-10 PSID
0-15 PSID
0-20 PSID
0-25 PSID
0-30 PSID
0-50 PSID
0-60 PSID
0-75 PSID
0-100 PSID
Range Type
Kpa
0-100 Kpa
0-160 Kpa
0-250 kpa
0-400 Kpa
0-600 Kpa
0-700 Kpa
Bar
0-1.0 Bar
0-1.6 Bar
0-2.0 Bar
0-2.5 Bar
0-4.0 Bar
0-6.0 Bar
0-7.0 Bar
The above mentioned ranges are some of the most popular requested today.
Mid-West Instrument can provide special un-cataloged dial range
requirements. As well as multiple scale dials, multiple color dials and special
decals. Please consult factory for complete information.
Model
Min. ΔP Range
Max. ΔP Range
121
0-5 PSID (0-0.35 bar)
0-100 PSID (0-7 bar)
Proof Pressure: Two times rated working pressure at ambient temperature.
Temperature Limits:
Switch Options: -40°F to + 200°F
Transmitter Options: -20° F TO + 150° F
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.
Standards: Model 121 Gauge either conforms to and/or is designed to the requirements of the following
standards:
ASME B1.20.1
NACE MR0175
ASME B40.100
NEMA Std. No. 250
CSA-C22.2 No. 14.25 and 30
SAE J514
EN-61010-1
UL Std. No. 50,508 and 1203
Standard Model Specifications: 121-AA-00-O(TT)
3000 PSIG Working Pressure, Aluminum Body, Adjusting Screws & End Plugs, Stainless Steel Piston,
Ceramic Magnet, Buna-N Seals, ¼” FNPT Back Connections, 2-1/2” round dial,
Engineered Plastic Case with Shatter Resistant Acrylic Lens,
4-20mA, 8-28 VDC Loop powered Transmitter in NEMA 4X/IP65 Plastic enclosure
with terminal strip, & ½” FNPT Conduit Connection, Accuracy ±2% Full Scale (Ascending)
Mid-West Instrument
1-800-648-5778
Range 0-5 PSID to 0-100PSID (0-.35 bar to 0-7.0 bar)
1
1
2
2
3
4
5
6
1
Basic Model
Range:_________________
2
A
S
Z
Material
Aluminum Body / Stainless Steel Piston
316 S.S Body / Stainless Steel Piston
Special (Un-coded Options)
3
A
C
E
G
T
Z
Dial Size & Type
2-1/2" Round Uni-Directional Dial w/Engineered Plastic Dial Case
4-1/2" Round Uni-Directional Dial w/Engineered Plastic Dial Case
3-1/2" Round Uni-Directional Dial w/Anodized Aluminum Housing Dial Case
4-1/2" Round Uni-Directional Dial w/Anodized Aluminum Housing Dial Case
Non-Indicating DP Switch Only
Special (Un-coded Options)
4
0
1
2
4
5
6
9
5
Seal Materials
Buna-N (Standard)
Viton®-A Registered Trademark of Dupont
Neoprene
Teflon®-A Registered Trademark of Dupont
Ethylene Propylene
Perfluorelastomers
Special (Un-coded Options)
Process Connections
0
1/4" FNPT Back Connections (Standard)
2
1/4" FNPT End Connections
3
1/4" FNPT Bottom Connections
4
1/2" FNPT End Connections
6
7/16"-20 Straight Thread "O" Ring Port (Back Connection)
9
Special (Un-coded Options)
Factory preset switches at no charge (Specify Setting)
7
8
Standard Model Specifications – continued Model 121
6
O
F
G
K
L
M
N
Q
S
T
U
W
Z
Additional Options
None
Carbon Steel 2" Pipe Mounting Kit
Stainless Steel 2" Pipe Mounting Kit
1/2" FNPT Stainless Steel Adapter
Liquid Fill (4-1/2" available with "G" option Aluminum Dial Case only) (not available with shatterproof lens)
Maximum Indicator Follower Pointer (Not available with Liquid fill option) (not available with shatterproof lens)
NACE
CRN (Canadian Registration Number) (2)
Shatter Proof Glass Lens (Available only with 4-1/2” Aluminum Dial Case) (not available with liquid fill)
Oxygen Cleaning
Stainless Steel Tag with S.S. Wire
Wall Mount Kit (Not available with back connections)
Special (Un-coded Options)
7
Electrical Configurations
A
B
E
F
One (1) Reed switch in NEMA 4X/IP65 Plastic enclosure with terminal strip (1/2” FNPT Conduit Connection)
Two (2) Reed switches in NEMA 4X/IP65 Plastic enclosure with terminal strip (1/2” FNPT Conduit Connection)
One (1) Switch in general purpose enclosure, Division 2 Hazardous Locations (1) (2)
Two (2) Switches in general purpose enclosure, Division 2 Hazardous Locations (1) (2)
4-20 mA Transmitter in NEMA 4X/IP65 Plastic enclosure with terminal strip
T
(1/2” FNPT Conduit Connection) (3)
4-20 mA Transmitter in NEMA 4X/IP65 Plastic enclosure. Division 2 Hazardous Locations with terminal strip
W
Z
(1/2” FNPT Conduit Connection) (1) (2) (3)
Special (Un-coded Options)
(1) Complete assembly 3rd Party Certified Class I, Div.2, Groups A, B, C, & D; Class II, Div.2, Groups F and G.
(2) 5000 PSIG SWP for Stainless Steel: 3000 PSIG SWP for Aluminum
(3) Contact factory for flow applications with transmitter configuration
8
A
E
F
G
T
Z
Electrical Specifications (For Resistive Loads)
SPDT 3W, 0.25 Amp, 125 VAC/VDC (standard) (Switch adjustable range of 15-95%)
SPST 60W, 3.0 Amp, 240 VAC/VDC (Normally Open) (Switch adjustable range of 20-95%)
SPST 60W, 3.0 Amp, 240 VAC/VDC (Normally Closed) (Switch adjustable range of 20-95%)
SPST 60W, 3.0 Amp, 240 VAC/VDC
(1) Normally Open, (1) Normally Closed (Switch adjustable range of 20-95%)
4-20 mA Transmitter (8-28 VDC Loop Power) ( ±2% accuracy from 20% to 100% of scale. Ascending)
Special (Un-coded Options)
MID-WEST INSTRUMENT has been serving a variety of industries (Power, Chemical, Petro-Chemical,
HVAC, Water Filtration etc…) for over 50 years. Over 700,000 piston type units have been produced bearing the MidWest name or private branded for our OEM customers!
Mid-West understands that in today’s demanding environment, flexibility, quick response time and the ability
to ship product in 2 weeks or less is essential to our customers. Standard configurations can be customized and
modified to suit our customer’s needs for ease of installation or retrofit.
If you are in need of additional information please visit our web site at www.midwestinstrument.com or
contact us toll free at 1-800-648-5778 and one of our knowledgeable sales coordinators will be happy to assist you…
6500 Dobry Dr. • Sterling Heights, 48314 MI USA • Tel: 800-648-5778 Tel: 586-254-6500 Fax: 586-254-6509
Web Site: www.midwestinstrument.com • Email: sales@midwestinstrument.com
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