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MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120 - Medium & High Operating Pressure Differential Gauges with Switch
MIDWEST INSTRUMENTMedium & High Operating Pressure Differential Gauges with Switch

MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120

The MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back is a medium and high operating pressure differential gauge with switch from the Series 120. It features a piston sensor type, a 4 1/2 in dial, and a…

SKU 3G-OTH-174638

Also listed as: 120AC00OAA50P · 120AC 00 O AA 50P

Brand
MIDWEST INSTRUMENT
Item
Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120
Category
Medium & High Operating Pressure Differential Gauges with Switch
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

MIDWEST INSTRUMENT
Manufacturer Part Number
120AC-00-O-AA-50P
Series
120
Type
120
Dial
4 1/2 in
NPT Female
1/4 in
Sensor Type
Piston
Gauge Accuracy
±3-2-3%
Housing Material
Aluminum
Certificate of Calibration
Not Included

Technical Documents

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MIDWEST INSTRUMENT Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back is a medium and high operating pressure differential gauge with switch from the Series 120. It features a piston sensor type, a 4 1/2 in dial, and a 1/4 in NPT female connection, with an aluminum housing and a gauge accuracy of ±3-2-3%. The manufacturer part number is 120AC-00-O-AA-50P, and a certificate of calibration is not included.

Frequently Asked Questions

What is the MIDWEST INSTRUMENT 120AC-00-O-AA-50P differential pressure gauge and switch used for?

This Series 120 gauge with switch monitors and controls differential pressure in medium to high operating pressure systems. It is used in industrial filtration, pump monitoring, and HVAC applications where a piston sensor and 4 1/2 in dial provide reliable readings.

What are the specifications of the MIDWEST INSTRUMENT 120AC-00-O-AA-50P?

The gauge has a 4 1/2 in dial, 1/4 in NPT female back connection, piston sensor, aluminum housing, and ±3-2-3% accuracy. It is part of the Series 120 and does not include a certificate of calibration. The manufacturer part number is 120AC-00-O-AA-50P.

Where to buy the MIDWEST INSTRUMENT 120AC-00-O-AA-50P worldwide?

3G Electric supplies the MIDWEST INSTRUMENT Series 120 differential pressure gauge and switch to customers worldwide. We handle full logistics and customs clearance, ensuring delivery to your site. Contact us for availability and lead time on this piston-type gauge.

How to install a MIDWEST INSTRUMENT Series 120 differential pressure gauge with switch?

Mount the gauge using the 1/4 in NPT female back connection, ensuring proper sealing with thread tape. Connect impulse lines to the high- and low-pressure ports. For the switch, wire according to the electrical rating specified on the nameplate. Always depressurize the system before installation.

Used in

Common applications for MIDWEST INSTRUMENT
Filter monitoring in industrial water treatment — MIDWEST INSTRUMENT 522 series 3-color differential pressure indicators
Flow measurement in chemical processing — MIDWEST INSTRUMENT Series 120 piston-type differential pressure gauges
Liquid level indication in oil and gas storage tanks — MIDWEST INSTRUMENT Model 142 diaphragm-type differential pressure gauges
HVAC system filter condition monitoring — MIDWEST INSTRUMENT Series 130 differential pressure gauges with glass-reinforced plastic housing
Pump differential pressure monitoring in industrial plants — MIDWEST INSTRUMENT 522 series indicators with switch for alarm output

MIDWEST INSTRUMENT Products

3G Electric supplies MIDWEST INSTRUMENT medium & high operating pressure differential gauges with switch. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Compatible alternatives & equivalents

Cross-referenced by specification & description
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 4 1/2 in Dial (MPN 120AC-00-O-AA-20P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 4 1/2 in Dial (MPN 120AC-00-O-AA-20P)
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 4 1/2 in Dial (MPN 120AC-00-O-AA-15P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 4 1/2 in Dial (MPN 120AC-00-O-AA-15P)
This differential pressure gauge with switch from the Series 120 is designed for medium and high operating pressure applications. It features a 4 1/2 in dial, 1/4 in NPT female back connection, and a piston sensor type. The aluminum housing provides structural integrity, and the gauge accuracy is ±3-2-3%. Certificate of calibration is not included
MIDWEST INSTRUMENT
This differential pressure gauge with switch from the Series 120 is designed for medium and high operating pressure applications. It features a 4 1/2 in dial, 1/4 in NPT female back connection, and a piston sensor type. The aluminum housing provides structural integrity, and the gauge accuracy is ±3-2-3%. Certificate of calibration is not included
This differential pressure gauge with switch from the Series 120 features a piston sensor and a 4 1/2 in dial with ±3-2-3% accuracy. The 1/4 in NPT female back connection and aluminum housing suit medium to high operating pressure applications such as filtration monitoring, pump protection, and flow measurement where both local indication and electrical switch output are required
MIDWEST INSTRUMENT
This differential pressure gauge with switch from the Series 120 features a piston sensor and a 4 1/2 in dial with ±3-2-3% accuracy. The 1/4 in NPT female back connection and aluminum housing suit medium to high operating pressure applications such as filtration monitoring, pump protection, and flow measurement where both local indication and electrical switch output are required
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 4 1/2 in Dial (MPN 120AC-00-O-AA-30P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 4 1/2 in Dial (MPN 120AC-00-O-AA-30P)
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 4 1/2 in Dial (MPN 120AC-00-O-AA-5P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 4 1/2 in Dial (MPN 120AC-00-O-AA-5P)

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