IMD-300

Miniature high-pressure transmitter IMD-300

IMD-300 is a miniature inductive pressure transmitter used for remote measurement of excess pressure in aircraft and industrial systems. The transmitter is intended for neutral gases, liquids, oils, fuel and aviation hydraulic fluids such as NGZh, when these media are permitted by the equipment documentation. It is installed directly in the pressure line, on a system unit or on a mounting panel, while the pressure value is displayed by a remote cockpit or operator-panel indicator. The unit itself does not show pressure locally. Its task is to convert the pressure of the working medium into an electrical signal for a compatible indicator.

Pressure conversion principle of the IMD-300 sensor

The IMD-300 works by an inductive measuring principle. Pressure enters the transmitter through the fitting and acts on an internal sensing element, such as a metal diaphragm or pressure spring. The deformation of this element moves a connected armature or core inside the electromagnetic system. As the armature position changes, the magnetic resistance and inductance of the coils change as well. The transmitter is connected with the remote indicator through an electrical bridge circuit. When pressure changes, the bridge becomes unbalanced and the indicator pointer moves according to the pressure value.

IMD-300 in aircraft hydraulic and fluid systems

The IMD-300 is used in aircraft systems where high-pressure monitoring is required. Typical installation areas include hydraulic circuits, fuel pressure lines, oil systems and pressure control points for special fluids. In hydraulic systems, the transmitter can be installed near hydraulic accumulators, pump stations, distribution blocks or main and emergency pressure circuits. In oil systems, it may be used to monitor pressure at the inlet to engine or gearbox lubrication circuits. In fuel systems, it may be installed after high-pressure fuel pumps if the specific equipment documentation requires pressure indication in this range.

Mounting locations for the IMD-300 transmitter

The IMD-300 is mounted in technical compartments, engine areas or hydraulic equipment zones, depending on the aircraft or industrial system layout. The transmitter fitting is screwed into a threaded seat on the pipeline, manifold, adapter or mounting panel. Sealing elements are used according to the installation documentation. In areas with strong vibration, the transmitter may be connected through a damped transition or impulse line instead of being mounted directly on a vibrating unit. The body should be protected from excessive water exposure, mechanical damage and unnecessary thermal influence where the installation permits it.

Indicators and signal chain around IMD-300

The IMD-300 operates with compatible “I” series indicators and UI1, UI2 or UI3 type pressure indicators. For high-pressure applications, it may be connected with indicators such as UI1-300 or UI2-300, depending on the equipment set. The transmitter and the indicator must match by pressure range and electrical parameters. If the transmitter range does not correspond to the indicator scale, the reading will be incorrect even if both units are serviceable. During troubleshooting, the full measuring chain should be checked: pressure source, transmitter, connector, wiring, power supply, bridge circuit and remote indicator.

Identification and modification options for IMD-300

The IMD-300 designation may appear together with related versions such as IMD-300S and IMD-300V. These modifications should not be treated as automatically interchangeable without documentation checks. The correct unit is selected according to pressure range, measured medium, installation geometry, connector type, environmental requirements and compatible indicator. Before ordering, it is useful to confirm the aircraft or equipment type, system name, installed indicator model and required modification. For repair or replacement work, a photo of the transmitter marking and connector helps reduce the risk of selecting the wrong version.

Product Type: Miniature inductive pressure transmitter
Designation: IMD-300
Alternative Designations: IMD300, ИмД-300, ИМД-300
Related Modifications: IMD-300S, IMD-300V / ИмД-300С, ИмД-300В
Function: Remote measurement of excess pressure and signal transmission to a compatible indicator
Application / Where Used: Aircraft hydraulic, oil, fuel, gas and special fluid pressure indication systems; industrial automation systems
System / Installation Area: Hydraulic pressure lines, oil systems, fuel lines, pressure manifolds, pump stations, distribution blocks, technical compartments
Associated Equipment: “I” series indicators; UI1, UI2, UI3 pressure indicators; UI1-300, UI2-300 according to equipment documentation
Measured Medium: Neutral gases, liquids, oils, fuel, aviation hydraulic fluids, NGZh and other compatible non-aggressive media
Measurement Range: 0…29.420 MPa / 0…300 kgf/cm²
Working Range: 5.884…23.536 MPa
Maximum Overload Pressure: Up to 35.304 MPa
Operating Principle: Inductive conversion of sensing element deformation into an electrical signal
Signal Transmission: Remote inductive bridge circuit with compatible indicator
Installation Method: Threaded fitting installation into pipeline, manifold, adapter, tee or mounting panel
Mounting Notes: May require sealing rings and vibration-damping impulse line depending on installation conditions
Electrical Connection: Cable connector on transmitter body
Technical Documentation: Equipment manual, aircraft maintenance documentation, wiring diagram, parts catalog, manufacturer technical documentation

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