Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

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 2 1/2 in dial, and a…

SKU 3G-OTH-174596

Also listed as: 120AA00OAA25P · 120AA 00 O AA 25P

Brand
MIDWEST INSTRUMENT
Item
Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120
Category
Medium & High Operating Pressure Differential Gauges with Switch
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

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
120AA-00-O-AA-25P
Series
120
Type
120
Dial
2 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

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

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 2 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 120AA-00-O-AA-25P, and a certificate of calibration is not included.

Frequently Asked Questions

What is the MIDWEST INSTRUMENT 120AA-00-O-AA-25P differential pressure gauge and switch used for?

This MIDWEST INSTRUMENT Series 120 gauge with switch monitors and controls differential pressure in medium to high operating pressure systems. It is commonly used in filtration, pump, and HVAC applications where a piston sensor provides reliable switching at a set point.

What are the specifications of the MIDWEST INSTRUMENT 120AA-00-O-AA-25P?

The gauge has a 2 1/2 in dial, 1/4 in NPT female back connection, aluminum housing, and piston sensor. Accuracy is ±3-2-3%. It is part of Series 120 and does not include a certificate of calibration. The manufacturer part number is 120AA-00-O-AA-25P.

Where to buy the MIDWEST INSTRUMENT 120AA-00-O-AA-25P worldwide?

3G Electric supplies the MIDWEST INSTRUMENT 120AA-00-O-AA-25P differential pressure gauge and switch to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this Series 120 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 the piston sensor is oriented per manufacturer guidelines. Connect impulse lines to the high- and low-pressure ports. Wire the switch contacts according to your control circuit. 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.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-20P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-20P)
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-10P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-10P)
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-15P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-15P)
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-30P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-30P)
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-50P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-50P)
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-75P)
MIDWEST INSTRUMENT
MIDWEST INSTRUMENT Differential Pressure Gauge & Switch: Back, 1/4 in NPT Female, 120, 2 1/2 in Dial (MPN 120AA-00-O-AA-75P)

More from MIDWEST INSTRUMENT

View all MIDWEST INSTRUMENT parts
This differential pressure gauge with switch features a piston sensor and aluminum housing. It has a 2 1/2 in dial with 1/4 in NPT female back connections and an accuracy of ±3-2-3%. Suitable for monitoring filter condition, pump performance, and flow in hydraulic, pneumatic, and process lines
MIDWEST INSTRUMENT
This differential pressure gauge with switch features a piston sensor and aluminum housing. It has a 2 1/2 in dial with 1/4 in NPT female back connections and an accuracy of ±3-2-3%. Suitable for monitoring filter condition, pump performance, and flow in hydraulic, pneumatic, and process lines
This differential pressure gauge with switch from the Series 220 uses a piston sensor and provides ±3-2-3% gauge accuracy. The 316 stainless steel housing and 1/4 in NPT female connection suit medium to high operating pressure systems. Typical applications include filtration monitoring, pump protection, and flow measurement in industrial processes. Rated IP65 4X for environmental protection
MIDWEST INSTRUMENT
This differential pressure gauge with switch from the Series 220 uses a piston sensor and provides ±3-2-3% gauge accuracy. The 316 stainless steel housing and 1/4 in NPT female connection suit medium to high operating pressure systems. Typical applications include filtration monitoring, pump protection, and flow measurement in industrial processes. Rated IP65 4X for environmental protection
This medium and high operating pressure differential gauge with switch from the Series 220 uses a piston sensor and provides ±3-2-3% accuracy. It features a 316 stainless steel housing, 1/4 in NPT female connection, and IP65 4X rating. Typical applications include monitoring differential pressure in filtration, pump protection, and flow measurement systems
MIDWEST INSTRUMENT
This medium and high operating pressure differential gauge with switch from the Series 220 uses a piston sensor and provides ±3-2-3% accuracy. It features a 316 stainless steel housing, 1/4 in NPT female connection, and IP65 4X rating. Typical applications include monitoring differential pressure in filtration, pump protection, and flow measurement systems
This differential pressure gauge with switch from the Series 140 features a diaphragm sensor and a 2 1/2 in dial. It has a 1/4 in NPT Female back connection and a 316 stainless steel housing. Gauge accuracy is ±3-2-3%. Suitable for monitoring differential pressure in medium to high operating pressure systems, such as filtration and pump applications
MIDWEST INSTRUMENT
This differential pressure gauge with switch from the Series 140 features a diaphragm sensor and a 2 1/2 in dial. It has a 1/4 in NPT Female back connection and a 316 stainless steel housing. Gauge accuracy is ±3-2-3%. Suitable for monitoring differential pressure in medium to high operating pressure systems, such as filtration and pump applications
This differential pressure gauge with switch from the Series 120 features a piston sensor and a 4 1/2 in dial. It has a 1/4 in NPT Female back connection and a 316 stainless steel housing. Gauge accuracy is ±3-2-3%. Certificate of calibration not included. Typical applications include monitoring and controlling differential pressure in industrial filtration, pump protection, and process monitoring systems
MIDWEST INSTRUMENT
This differential pressure gauge with switch from the Series 120 features a piston sensor and a 4 1/2 in dial. It has a 1/4 in NPT Female back connection and a 316 stainless steel housing. Gauge accuracy is ±3-2-3%. Certificate of calibration not included. Typical applications include monitoring and controlling differential pressure in industrial filtration, pump protection, and process monitoring systems
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
Medium and high operating pressure differential gauge with switch from the Series 142. Features a diaphragm sensor, aluminum housing, and 2 1/2 in dial with 1/4 in NPT Female back connection. Gauge accuracy is ±3-2-3%. Used for measuring and controlling pressure differences in industrial fluid systems such as filtration monitoring and pump protection
MIDWEST INSTRUMENT
Medium and high operating pressure differential gauge with switch from the Series 142. Features a diaphragm sensor, aluminum housing, and 2 1/2 in dial with 1/4 in NPT Female back connection. Gauge accuracy is ±3-2-3%. Used for measuring and controlling pressure differences in industrial fluid systems such as filtration monitoring and pump protection
This differential pressure gauge with switch from the Series 120 features a piston sensor and an aluminum housing. It has a 4 1/2 in dial with ±3-2-3% accuracy and a 1/4 in NPT Female back connection. Suitable for monitoring and controlling differential pressure in medium to high pressure systems, such as filtration, pump monitoring, and HVAC applications
MIDWEST INSTRUMENT
This differential pressure gauge with switch from the Series 120 features a piston sensor and an aluminum housing. It has a 4 1/2 in dial with ±3-2-3% accuracy and a 1/4 in NPT Female back connection. Suitable for monitoring and controlling differential pressure in medium to high pressure systems, such as filtration, pump monitoring, and HVAC applications