JUMO MIDAS H20 HP High-Pressure OEM Pressure Transmitter

Thin-film transmitter for hydraulics up to 1000 bar

The JUMO MIDAS H20 HP (type 401020) is a thin-film OEM pressure transmitter for hydraulic pressure from 0 to 100 bar up to 0 to 1000 bar. Its welded sensor design is meant to stay leak-tight under more than 10 million load cycles, and the stainless housing is only about 35 mm long in its shortest form.

JUMO lists mobile hydraulics such as forklifts, harvesters and construction machinery, injection moulding machines, laundry and cleaning systems, welding machines and industrial hydraulics. Connector choices cover M12, Deutsch DT04, Metri-Pack, AMP Superseal, DIN line socket and an attached cable, and an ECE type approval is available for mobile hydraulic use.

Technical specifications

Order code and options

After type 401020 and basic extension 000 the code gives the measuring range (464 for 100 bar, 465 for 160, 511 for 200, 466 for 250, 517 for 350, 467 for 400, 468 for 600, 469 for 1000, 999 special), the output (405, 412, 415, 418 or 420) and the process connection (511 NPT, 521 G 1/4, 544 UNF). The connection material is stainless steel (20), and the electrical connection is 11 attached cable, 36 M12, 52 Metri-Pack series 150, 61 DIN line socket, 77 AMP Superseal or 89 Deutsch DT04.

Extra codes are 061 for UL approval (indoor use), 591 for a choke in the pressure channel, and 624 for oil and grease free preparation. The G 1/4 connection is limited to ranges up to 400 bar and the 7/16-20 UNF connection to ranges up to 600 bar.

Using it on hydraulic systems

A choke in the pressure channel (extra code 591) damps pressure spikes in pump circuits, and the stated shock and vibration ratings suit machine-mounted installation. The product is rated for industrial use only. Choose the range so that normal working pressure is below the nominal end value; the overload and burst columns in the data sheet are in bar for each range.

For compressed-air and low-pressure work, the ceramic MIDAS type 401001 is the better match.

Installation on hydraulic machines and power units

Fit the MIDAS H20 HP at a point where it sees the pressure you actually want to control or monitor, for example directly after the pump, at a valve block or at an actuator port. Mounting it in a dead-end branch with trapped air can slow the response and distort readings during fast pressure changes. On mobile machines, route the sensor cable away from hot hydraulic lines, exhaust components and moving linkages, and secure it so that vibration does not work the connector loose over time.

Tighten the process connection to the torque given in the JUMO documentation and use the correct sealing method for the thread form chosen: the G 1/4 and UNF versions seal with the FKM seal listed in the data sheet, while the NPT thread seals on the thread itself. Follow the tightening method described in the manufacturer documentation and avoid applying force through the electrical connection or cable.

Electrical connection checks

Before power-up, confirm that the output option in the order code matches the input of the controller or PLC card. A 4 to 20 mA loop and a ratiometric 0.5 to 4.5 V signal are not interchangeable, and ratiometric outputs must be supplied from the same reference voltage the controller uses for its measurement. Keep signal wiring separate from solenoid and motor cables where possible to limit interference.

Commissioning and functional testing

With the system depressurised, check that the controller shows the zero-pressure value expected for the selected output. Then raise pressure in steps while comparing the transmitter reading with a calibrated reference gauge, if one is available on the test bench. Record these values as a reference for later checks. If pressure spikes are visible on the signal during valve switching or pump start, review whether the choke option described above would suit the circuit for future orders.

Selection checks for heat, dust and humidity in the GCC

Hydraulic equipment in Oman often works in direct sun, in dusty quarries and construction sites, or in humid coastal ports. When choosing the connector, compare the protection ratings listed in the specification table with the actual exposure: a connector that will be hosed down or splashed needs a different choice from one inside a closed cabinet. Check the medium temperature limit against the realistic oil temperature on a hot day, since hydraulic oil in a heavily loaded machine can run considerably warmer than in temperate climates.

Dust and sand affect the transmitter mainly at the connector and cable. Keep mating connectors closed when a sensor is removed, clean them before reconnection, and avoid leaving cable ends open on site. In humid areas, inspect connectors for corrosion at service intervals.

Maintenance during machine service

The transmitter itself has no user-serviceable parts, so maintenance consists of visual inspection, connector and cable checks, and periodic comparison against a reference gauge as part of the machine’s service plan. If a reading drifts or becomes unstable, check wiring, supply voltage and connector condition first before replacing the sensor, and quote the full type code when ordering a replacement so that range, output and connection match the original.

Documents and quotation

Seven Star LLC is an independent supplier in Muscat and can quote this item on request. The reference document is JUMO MIDAS H20 HP data sheet 401020 (EN), attached as a PDF; verify the pressure range, connector type and approval code against it, then send us the type code for a quotation. Browse Pressure Instrumentation for alternatives.