MIDWEST INSTRUMENT

The Series 120 and Series 140 are both designed for medium and high operating pressures, but they differ in sensor type and housing materials. Series 120 models typically use a piston sensor and may have aluminum or 316 stainless steel housings. Series 140 models use a diaphragm sensor and are often constructed with 316 stainless steel housings. Both offer ±3-2-3% gauge accuracy and 1/4 in NPT female connections. The choice depends on the specific pressure range, media compatibility, and environmental conditions. Series 120 piston sensors are generally suited for higher pressure ranges, while Series 140 diaphragm sensors may be preferred for lower differential pressures or where a diaphragm seal is beneficial.

The 522P-015-LA features color-coded transition points to provide visual indication of differential pressure status. The green zone indicates 0 to 7.5 psid, which typically represents a normal or acceptable differential pressure. The yellow zone indicates a warning range, and the red zone indicates an alarm or high differential pressure condition. These color codes help operators quickly assess filter condition or flow status without needing to read a numerical value. The indicator also includes a switch that can be wired to alarms or control systems. The sensor is Buna-N and the housing is Acetal plastic, with an IP65 rating for protection against dust and water.

Midwest Instrument differential pressure gauges and indicators comply with several industry standards, depending on the model. Commonly referenced standards include ASME B1.20.1 for pipe threads, ASME B40.100 for pressure gauges, CSA-C22.2 No. 14 for industrial control equipment, EN-61010-1 for safety requirements of electrical equipment, NEMA Std. 250 for enclosures, and UL Std. No. 50 and 508. Some models are also CE marked and RoHS compliant. These standards ensure that the instruments meet requirements for safety, performance, and environmental protection. For specific compliance details, refer to the individual product specifications. 3G Electric provides this information to assist in selecting the appropriate model for your application.

Yes, Midwest Instrument differential pressure gauges are designed to measure pressure differences in both fluid and gas systems. The compatibility with specific media depends on the wetted materials of the sensor and housing. For example, models with Buna-N sensors are suitable for many oils, water, and air, but may not be compatible with certain solvents or aggressive chemicals. Models with 316 stainless steel housings and diaphragms offer broader chemical resistance. It is important to verify that the wetted materials are compatible with the process media. The product specifications list the sensor type and housing material, which can be used to assess compatibility. 3G Electric can provide additional details on request.

Midwest Instrument Series 130 differential pressure gauges have a gauge accuracy of ±3-2-3% of full scale. This means the accuracy is ±3% for the first quarter of the scale, ±2% for the middle half, and ±3% for the last quarter. This accuracy specification is common for differential pressure gauges and provides reliable measurement across the range. The Series 130 features a diaphragm sensor and a glass-reinforced plastic housing, with 1/4 in NPT female back connections. It is suitable for medium and high operating pressures. The IP65 rating ensures protection against dust and water ingress. For precise application requirements, consult the product datasheet or contact 3G Electric for assistance.

Yes — 3G Electric (S) Pte. Ltd. supplies MIDWEST INSTRUMENT products. We stock the MIDWEST INSTRUMENT catalog and supply genuine factory-original products with full manufacturer warranty and technical support.