Mid-West® Instrument Diaphragm ΔP Gauges- Our diaphragm type gauge, the high and low-pressure ports are completely isolated from each other. There is no bypass and therefore they can be used for air, gas and liquids. They also come in a variety of dial scales allowing for very sensitive measurements. The Differential Pressure is sensed by the movement of an elastomer diaphragm against a precision calibrated range spring. The change in position of the diaphragm in response to the change in Differential Pressure moves an internal magnet. This magnet, in turn, causes a rotary magnet external to the gauge body to rotate and indicate ΔP on a dial.
Diaphragm-Type Differential Pressure Gauges are available with one or two hermetically sealed reed switches or a 4-20mA transmitter model dependent. 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 configurations for various load/power ratings. The switches can be set to activate or deactivate on rising or falling pressure. Models 130, 140, 142, 522, & 522A Switches are “CE” marked per the EU Low Voltage and RoHS Directives.
The Model 700 series uses a piezoresistive differential pressure sensor element. Silicone oil is filled between the die and 2 stainless steel diaphragms. The measured differential is amplified into a usable voltage or converted into a 4-20 ma output.
Hazardous location switches Models 140, and 142 are certified CSA and UL to Canadian & US Standards. Model 240 is CSA, UL Listed and CE marked to the ATEX directive and KOSHA certified along with the option for DPDT relays for higher load applications. The CSA & UL listings are for the entire assembly and not just the enclosure. See individual models for complete specifications.
Mid-West Instrument has the capability to design and engineer a Differential Pressure Gauge, Switch or Transmitter to the exact requirements of the customer. Dial size, Process connection Size and location, etc. can also be customized to the customer’s requirements. Mid-West has one of the fastest production times in the Industry. Our standard production time on most gauges is 7-10 business days or less.
Mid-West Instrument has the equipment and printing technology to provide color dials, flow scales and customer logo dials.
Please contact your Sales Coordinator for additional information and terms.
| Model No. | Differential Pressure Range | Accuracy | Working Pressure | Electrical Available | Specifications | Installation/ Operation Manual | Electrical IOM | Drawing |
|---|---|---|---|---|---|---|---|---|
| Model 114 | 0-0.72 PSID (0-20" H20) to 0-20 PSID (0-600" H2O) Tank Level Applications |
±3/2/3% | 1000 PSI | CE / LVD, RoHS Compliant, NEMA 4X, 4-20mA Transmitter | ||||
| Model 130 | 0-5" H2O to 0-15 PSID (0-400" H2O) | 0-5" H2O to 0-9.9" H2O ±5% 0-10" H2O to 0-15 PSID ±3/2/3% |
Up to 500 PSI | CE / LVD, RoHS Compliant, NEMA 4X, Class 1-Div. 1 | ||||
| Model 140 | 0-50" H2O to 0-100 PSID | 0-50" H2O to 0-399" H2O ±5% 0-15 PSID to 0-100 PSID ±3/2/3% |
Up to 3,000 PSI | CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter | ||||
| Model 142 | 0-20" H2O to 0-25 PSID | ±3/2/3% | Up to 3,000 PSI | CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 2, 4-20mA Transmitter | ||||
| Model 522 | 0-5 PSID to 0-50 PSID | ±5% | 1,000 PSI | CE / LVD, RoHS Compliant | N/A |
| Model No. | Differential Pressure Range | Accuracy | Working Pressure | Electrical Available | Specifications | Installation/ Operation Manual | Electrical IOM | Drawing |
|---|---|---|---|---|---|---|---|---|
| Model 240 | 0-20" H2O to 0-100 PSID | ±3/2/3% | Up to 1500 PSI | CE / ATEX / RoHS Compliant CSA, UL & KOSHA CERTIFIED, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter | N/A | |||
| Model 700 / 710 / 715 | 0-5 PSID to 0-300 PSID | ±0.50% | 2,900 PSI | 2-Wire 4-20 mA Transmitter 15-28 VDC, LCD = 4-20 mA Transmitter 18-28 VDC, LED = 4-20 mA Transmitter 20-28 VDC 3 Wire 15-28 VDC/1-5 VDC, 15-28 VDC/0-5 VDC, 15-28 VDC/0-10 mADC, 15-28 VDC/0-20 mADC, 15-28 VDC/0-10 VDC |
N/A |
| Model No. | Differential Pressure Range | Accuracy | Working Pressure | Electrical Available | Specifications | Installation/ Operation Manual | Electrical IOM | Drawing |
|---|---|---|---|---|---|---|---|---|
| Model 522C3-Color Dial | 0-5 PSID to 0-50 PSID | ±5% | 1,000 PSI | CE / LVD, RoHS Compliant | N/A | N/A | ||
| Model 555A3-Color Dial | 0-3.5 PSID to 0-43 PSID | ±5% | 300 PSI | Not Available | N/A | N/A | N/A |
