MKM-250V2

MKM-250V2 gauge for aircraft oxygen systems

The MKM-250V2 is a compact aircraft pressure gauge used for monitoring gaseous oxygen pressure in onboard oxygen systems. It is installed where the crew, maintenance personnel, or service equipment needs a direct pressure reading from an oxygen line, cylinder group, distribution block, or oxygen unit. This is not a laboratory micromanometer for low-pressure measurements. The MKM-250V2 is an aviation oxygen manometer for high-pressure gas systems, with a scale intended for practical control of oxygen charge and system pressure on aircraft and helicopters.

Where the MKM-250V2 is installed

The MKM-250V2 can be mounted in aircraft oxygen equipment bays, on crew cabin panels, on oxygen distribution blocks, or directly on oxygen supply units, depending on the aircraft design. Its purpose is simple: to show whether the oxygen system has the required pressure and whether the cylinder or line is ready for use. In aircraft service, this matters before flight, during maintenance, and when checking portable or fixed oxygen equipment. The instrument is selected by pressure range, oxygen compatibility, connection type, and the requirements of the specific aircraft documentation.

Oxygen compatibility of the MKM-250V2

Since the MKM-250V2 works with gaseous oxygen, cleanliness is critical. The internal parts and connection surfaces must be free from oil, grease, and other contaminants that are dangerous in oxygen systems. For this reason, oxygen pressure gauges are handled differently from general-purpose pressure instruments. The scale or body is normally marked for oxygen use, and the instrument must not be installed in systems with incompatible media unless documentation permits it. Even a small contamination of an oxygen fitting can create a serious safety risk.

Pressure indication with the MKM-250V2

The MKM-250V2 measures pressure over a high-pressure oxygen range up to its upper scale limit. The instrument is intended for operational monitoring rather than laboratory reference measurement. At normal temperature, the indication accuracy is better than at extreme temperatures, which is typical for compact mechanical aircraft gauges. This should be considered during inspection and troubleshooting: a reading should be interpreted according to the allowed error, ambient conditions, and the pressure limits defined for the oxygen system being checked.

Vibration-resistant design of the MKM-250V2

The MKM-250V2 is made for aircraft conditions, where vibration and movement are normal operating factors. A small gauge installed on an oxygen block or panel must keep readable indication without rapid wear of the measuring mechanism. During maintenance, attention is usually paid to pointer behavior, glass condition, scale readability, threaded connection, case damage, and leakage signs. If the pointer sticks, does not return correctly, or the scale marking is unclear, the gauge should not be treated as reliable only because it is still installed in place.

Service life and supply of MKM-250V2

The MKM-250V2 is an aviation technical item with defined service and storage limits. When ordering, it is worth specifying the exact designation, because MKM-250V, MKM-250V2 and visually similar oxygen gauges may differ by execution, markings, or documentation. For supply, the key points are passport availability, acceptance or calibration status, oxygen-clean condition, storage history, and remaining service life. If the requirement is for an aircraft installation, the gauge should be checked against the oxygen system documentation, not only by the pressure range on the dial.

Product Type: Aircraft oxygen pressure gauge / manometer
Designation: MKM-250V2 / МКМ-250В2
Function: Measurement of excess pressure of gaseous oxygen
Application / Where Used: Aircraft and helicopter oxygen systems, oxygen units, cylinder blocks, distribution equipment
System / Installation Area: Onboard oxygen systems and oxygen equipment compartments
Measured Medium: Gaseous oxygen
Measurement Range: 0–250 kgf/cm²
Main Purpose: Pressure control in aircraft oxygen systems
Basic Error at +25 °C: Not more than ±6% of the upper measurement limit
Additional Error at Extreme Temperatures: Up to ±10%
Operating Temperature Range: −60 to +60 °C
Construction Type: Compact mechanical oxygen pressure gauge
Installation: Rear threaded connection to high-pressure oxygen line or oxygen unit, depending on configuration
Oxygen Safety Requirement: Degreased oxygen-compatible internal cavity and connection surfaces
Marking: Oxygen-use marking / “Oxygen” indication on scale or body depending on execution
Vibration Resistance: Aircraft vibration-resistant execution
Weight: Not more than 0.1 kg
Assigned Service Life: 15 years
Operating Resource: 5000 flight hours
Storage Life: 5 years
Technical Documentation: Product passport, calibration / acceptance documentation, aircraft oxygen system documentation as applicable

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Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.