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Model 3112 Portable Live Pressure Tester

Product Details

The Model 3112 Portable Live Pressure Calibration and Test System is a compact, completely self-contained unit designed for calibrating and testing pressure gauges, transducers, pressure switches, and other pressure-sensitive instruments up to 2,000 psi with an accuracy of ±0.5% of full scale. Two large, legible gauges, reading from 0 to 100 psig and 0 to 2,000 psig respectively, and controlled by an automatic transfer valve, permit precise stepless measurements over the entire range of the system. Other pressure ranges and units of measure (e.g., kPa) are available upon request.

An internal nitrogen cylinder with a capacity of 90 cubic inches (7.1 std. cubic feet when charged at 2,250 psi at 70°F), permits the Model 3112 Portable Live Pressure Calibration and Test System to be easily transported to remote locations—no external gas or power sources are required. The cylinder can be charged using any available high pressure nitrogen source, and is wire-wound for protection against impact. Additional safety features include “blow-out back” master gauges to protect the operator from glass breakage in the event of a malfunction, burst discs to guard against inadvertent over-pressurization, and a relief valve designed to protect the test item and master gauges from damage.

  • Housed in a weatherproof, compact, and rugged aluminum carrying case with a locking hinged lid.
  • Internal nitrogen cylinder with a capacity of 90 cubic inches (7.1 std. cubic feet when charged at 2,250 psi at 70°F), permits the Model 3112 Portable Live Pressure Calibration and Test System to be easily transported to remote locations—no external gas or power sources are required.
  • Additional safety features include “blow-out back” master gauges to protect the operator, burst discs to guard against over-pressurization, and a relief valve designed to protect the test item and master gauges from damage.
  • No external gas sources required: Instrument case houses one 90 cubic inch (7.1 std. cubic feet when charged to 2,250 psi at 70°F) nitrogen cylinder.
  • Automatic cut-out valve for stepless measurements between the two test gauges.
  • Built-in 65 to 250 VAC electrical test with LED lamp for convenient pneumatic switch testing.

Master Gauges:

  • Accuracy: 0.25% of Full Scale
  • Range: 0 to 100 psig, 0 to 2000 psig Standard*
    *Custom ranges available by request

Supply Gauge: Range: 0 to 3000 psig

Fill and Test Port Material: 300-Series Stainless Steel, AND 10056-4 (1/4” flare)

Internal Supply Cylinder:
Capacity: 7.1 Standard Cubic Feet
Rating: ICC 3AA to 2,250 psig. Retest due date noted on panel face

Plumbing: Material 300-Series Stainless Steel

Filtration: 10µm nominal

Test Hose: 5 Feet with AN Flare Swivel Fittings

Electrical Tester:
Voltage Range: 65 to 250 VAC
Test Lead Length (qty. 2): 5 Feet
Terminations: Male Plugs and Alligator Clips

Dimensions, excluding handle: 16”W x 8”H x 9”D

Weight: 22 lbs.

During setup, the Model 3112 Portable Live Pressure Calibration and Test System is first connected to the item to be calibrated using a 5-foot-long braided test hose. The hose is terminated at both ends with 1/4″ female swivel AN fittings and doubles as a charging hose for the nitrogen cylinder.

To test an item, gas from the nitrogen cylinder is metered into the test circuit via a precision soft seat control valve (see diagram below), and applies pressure simultaneously to the item undergoing calibration and the master reference gauges. This enables the operator to easily perform comparative readings.

As the pressure is increased during testing, readings are transferred automatically from the low range (0 to 100 psig) gauge to the high range (0 to 2,000 psig) gauge. A second control valve is used for venting, allowing precise downscale measurements to be performed. As the test pressure drops, the transfer valve automatically switches from the high range gauge to the low range gauge.

pressure-vacuum-calibrators-portable-live-pressure-tester-circuitA 65 to 250 VAC electrical tester is built into the Model 3112 Portable Live Pressure Calibration and Test System for convenient pneumatic switch testing. The electrical tester is connected from the front panel of the test system to the switch being tested using two 5-foot leads terminated with alligator clips. The presence of electrical current is shown using a neon lamp. The lamp will illuminate to indicate that voltage is present; when applied pressure trips the switch, the lamp will turn off.

All components of the Model 3112 Portable Live Pressure Calibration and Test System, including the test hose, technical manuals, and other supplies, are housed in a weatherproof, compact, and rugged aluminum carrying case with a locking hinged lid. A pressure relief valve built into the storage case protects the system from internal gas leakage during storage.

Ordering Information

Standard versions of the Model 3112 Portable Live Pressure Calibration and Test System are equipped with a 0 to 100 psig low-range master gauge and a 0 to 2,000 psig high-range master gauge. NSN (National Stock Number) 6685-821-0798 is applicable to this standard version.

The Model 3112 Portable Live Pressure Calibration and Test System may also be ordered with customer-specified measurement ranges for the master gauges. The minimum range available for the low-range master gauge is 0 to 15 psig. The maximum range for the high-range master gauge is 0 to 3,000 psig. Other modifications, such as metric scale units, are available upon special request.

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