Model 114
Diaphragm Type
Tank Level Gauge
±3-2-3% Accuracy (Descending) — ASME B40.100, Grade B
The Mid-West Instrument Model 114 is a high-sensitivity differential pressure gauge designed specifically for tank level measurement. Using a flexible elastomer diaphragm, it accurately converts liquid head pressure into a clear, easy-to-read analog dial reading.
Engineered for both mobile and stationary tanks, the Model 114 works with air, gas, and compatible liquids—including cryogenic applications. Available in multiple dial sizes and scales, it’s ideal for monitoring helium, argon, nitrogen, oxygen, CO₂, and more.
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Product Features/Benefits
- Competitively Priced Rugged Convoluted Diaphragm Design
- Glass Reinforced Thermoplastic Dial case (Panel Mountable) (Anodized Aluminum Dial Case Option available contact sales for more information)
- Weather Resistant & Corrosion Resistant
- Shatter Resistant Lens
- Over-Range Protection, High over Low and Low over High
- Terminal Strip Switch & Transmitter options
- 5 Year Warranty
- For complete model details See Bulletin_114.pdf
- Installation and Operation Manual See Bulletin: IOM_114.pdf
Specifications / Configuration
- Dial Sizes available: 2-1/2”, 4-1/2” and 6” Diameters
- Dial Scale Ranges: 0-20” H2O to 0-600” H2O
- Differential Full Scale Descending Accuracy ±2% (ASME B40.100)
- Available in a Variety of Dial Scales: LOX, Ar, O2, N2, LBS. CO2, CM H2O, MM H2O, KGS, LNG, etc.
- Working Pressures up to 1000 PSIG (69 Bar)
- Operating Temp -40°F to +200°F (-40°C to +93°C)
- Weather Protection NEMA 4X/IP66
- Material of Construction of Body - Aluminum, Brass, 316/316L Stainless Steel (Wetted Part)
- Internal wetted parts-316 Stainless Steel, Ceramic Magnet and Teflon Guide Bushings
- Multiple instrument process connection size and locations available
- Elastomers (O-ring and Diaphragm Matertials): Buna-N, Viton, Ethylene Propylene.
- For complete specifications see: Specificationssheet_114.pdf
Common Applications
- Pressurized Tank Level Monitoring
- Stationary Tanks – Horizontal or Vertical
- Tanker Transport / Over the road trailers For materials such as LOX, CO2, Ammonia, Nitrogen Helium, Nitrogen, Hydrogen and Argon
Electrical Options – Model 114:
Switch & Transmitter Configurations
Model 114 diaphragm-type tank level gauges can be equipped with up to two hermetically sealed reed switches for high and/or low level alarms. Switches are mechanically adjustable, allowing users to fine-tune the set point across a defined portion of the scale. Upon request, Mid-West Instrument can factory-set switch points to your specifications.
- Switch Output Options:
- SPDT: 3W, 0.25A, 125 VAC/VDC
- SPST (Normally Open): 25W, 0.5A, 230 VAC/VDC
- No external power required to operate switches
- CE marked to EU Low Voltage and RoHS Directives
- NEMA 4X / IP66 weather-resistant enclosures
- Field-wired terminal strip included
Transmitter Option
The Model 114 also offers a 2-wire, loop-powered 4–20 mA differential pressure transmitter. This microprocessor-based system uses a magnetic angle sensor to precisely track pointer movement and convert it into an analog signal.
- Loop Power: 8–28 VDC
- Accuracy: ±2% (20%–100% of scale, descending)
- Aluminum enclosure with ½″ FNPT conduit connection
- Individually calibrated using an 11-point linearization technique
- Optional CE marking to EMC Directive available upon request
Additional Options:
- ¾” FNPT Stub Mount
- Pipe Mounting Kit - 2" U-Bolt
- Wall Mounting Kit
- Multiple 3-Valve Manifold options
- Oxygen Cleaning
- Maximum Follower Pointer
The Mid-West Advantage
- 1 year warranty
- 30 + Years Hazardous Location product manufacturer.
- OEM and Private Label Capabilities
- Fast on-time Deliveries
- Friendly Customer Support
- Certified Quality System CSA B51-09 SAI GLOBAL
Tank Level , Diaphragm Type
| 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 |
Tank Level , Bellows Type
| Model No. | Differential Pressure Range | Accuracy | Working Pressure | Electrical Available | Specifications | Installation/ Operation Manual | Electrical IOM | Drawing |
|---|---|---|---|---|---|---|---|---|
| Model 115 | 0-10" H2O to 0-69.9" H2O Tank Level Applications |
±1% | 500 PSI (Optional 1,000 PSI) | None available | N/A | |||
| Model 116 | 0-70" H2O to 0-800" H2O Tank Level Applications |
±1% | 500 PSI (Optional 1,000 PSI) | MICRO SWITCHES 0-80" H2O to 0-800" H2O NEMA 4X, CSA LISTED IND. CONT. EQUIP. |
