Model 115

Bellows Type

Tank Level Gauge

Mid-West^® Instrument Model 115 Tank Level ΔP Gauge – ± 1% Full Scale Accuracy. System pressure is applied to the internal volume of a bellows and mechanical linkage assembly. As pressure changes, the bellows and linkage assembly is mechanically coupled to the gauge indicator pointer. The major components of the Model 115 are a two-piece body, bellows sensing element and over-pressure assembly, a torque tube assembly, a range spring and the gauge front assembly.

This assembly incorporates a bi-directional over-pressure relief valve (OPV) which provides protection in both directions. When the Differential Pressure exceeds 130% of the range the OPV equalizes the pressure between the Hi and Lo sides. ¼” FNPT Dual top and bottom connections are provided as standard. Model 115 Tank Level gauge is also equipped with a Micro adjust pointer. If necessary, the pointer can be re-zeroed. Body is made of brass with 316 Stainless Steel internals. Viton Seals are provided as standard. The Dial is 6” diameter with white lettering on a black dial. (White dial with black lettering optional) The 115 temperature limits are rated at -40° F to 200°F. Proof pressure is Two Times working pressure at ambient temperature.

Product Features/Benefits

Rugged Bellows Sensing Element
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.