Model 115
Bellows Type
Tank Level Gauge
±1% Full Scale Accuracy | Bi-Directional Over-Pressure Protection | Field-Adjustable Pointer
The Mid-West® Instrument Model 115 is a high-accuracy differential pressure gauge designed for liquid level monitoring in closed tank systems. Using a bellows-type sensing element and mechanical linkage, the gauge provides reliable, direct-acting differential pressure (ΔP) readings with ±1% full-scale accuracy.
The internal assembly includes a two-piece brass body, bellows sensor with over-pressure protection, torque tube mechanism, range spring, and a 6-inch gauge front with clear dial graphics. A built-in micro-adjust pointer allows the user to re-zero the gauge as needed.
To safeguard the system, the Model 115 includes a bi-directional Over-Pressure Relief Valve (OPV). When differential pressure exceeds 130% of the rated range, the OPV equalizes pressure between the high and low sides, protecting internal components.
Key Features:
- Bellows sensing element with mechanical linkage
- Micro-adjust pointer for easy re-zeroing
- Bi-directional over-pressure protection (activates at 130% of range)
- ¼” FNPT dual top and bottom process connections
- Brass body with 316 stainless steel internals
- Viton® seals standard (other materials available)
- 6” dial: white-on-black standard; black-on-white optional
- Temperature range: -40°F to 200°F
- Proof pressure: 2x working pressure at ambient temperature
The Model 115 is ideal for monitoring liquid levels in cryogenic and industrial gas tanks and can be configured with custom dial scales for specific applications.
Contact Us Today For Availability
Product Features/Benefits
- Rugged Bellows Sensing Element
- Micro-adjust pointer for easy re-zeroing
- Glass Reinforced Thermoplastic Dial case (Panel Mountable)
- Weather Resistant & Corrosion Resistant Gauge Front
- 270° Dial Arc
- Shatter Resistant Lens
- Over-Range Protection, High over Low and Low over High
- 1 Year Warranty
- For complete model details See Bulletin_115_116.pdf
- Installation and Operation Manual See Bulletin: IOM_115.pdf
Specifications / Configuration
- Dial Sizes available: 6” Diameters
- Dial Scale Ranges: 0-10” H2O to 0-69.9” H2O
- Differential Full Scale Ascending Accuracy available: ±1% (ASME B40.1 Grade 1A)
- Available in a Variety of Dial Scales: LOX, Ar, O2, N2, LBS. CO2, CM H2O, MM H2O, KGS, LNG, etc.
- Working Pressures 500 PSIG (34 Bar) 1000 PSI optional (69 Bar)
- Operating Temp -40°F to +200°F (-40°C to +93°C)
- Weather Protection & Corrosion Resistant
- Material of Construction of Body - Brass (Wetted Part)
- Internal wetted parts-316 Stainless Steel
- Dual Top and Bottom Process connections
- Brass Snubber fittings mounted in bottom process connections
- Optional O-rings Materials Buna-N, Viton, and Ethylene Propylene.
- For complete specifications see: Specificationsheet_115_116.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
Additional Options:
- ¾” FNPT Stainless Steel Stub Mount Bracket
- Pipe Mounting Kit - 2" U-Bolt
- Multiple 3-Valve Manifold Options
- Oxygen Cleaning
- CRN – Canadian Registration Number
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
Model 115Documents
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. |
