◁Measuring equipment

▼Glycerin-filled pressure gauge ø39

Glycerin filled pressure gauge ø39 OPG

RoHS
グリセリン圧力計 OPGΦ39
グリセリン圧力計 OPGΦ39 側面

A space-saving glycerin-filled pressure gauge with an outer diameter of Φ39 that can be directly screwed into a modular valve!
Pressure gauges do not touch each other even when modular valves are stacked.

    • Our original “Coloring CR-39” is now standardly included with the product!

      (Applicable to shipments from our company starting November 4, 2025)

      Easily set the proper pressure range with two colors — red and green!

    • Stainless steel case <improved contact durability>

    • Filling of pure glycerin liquid <improved pulsation effect>

    • 270-degree pressure angle indications for improved clarity.

    • This gauge can be mounted directly onto the pressure port of the modular type hydraulic circuit.

    • he pressure gauge root section is equipped with special slots for absorbing pulsating pressure and surge pressure.

    • Even of modular valves are stacked, pressure gauges do not make contact with each other.

    • Movement of the pointer due to mechanical vibration is absorbed by the viscous drag by pure glycerin liquid in the hermetically-sealed pressure gauge.

      Movement of the Bourdon tube is also absorbed, improving the absorption effect of the pulsating pressure of the fluid.

    • The pure glycerin liquid serves as lubricating oil for the friction part of the bearing and gear in the pressure gauge,

      thereby further improving the durability of the internal mechanism in comparison with the existing products.

    • Safety measures are provided to ensure that the transparent sheet at the front is not shattered,

      and hydraulic oil is purged from the safety valve in the case that the Bourdon tube is broken.

    • The green safety mark attached to the circumference of the transparent sheet assists in the setting of a pressure range and values.

    • Select a pressure gauge whose top pressure reading is more than double the applicable pressure range.

  • !Starting with our shipments from November 4, 2025, the "CR-39" color ring will be standard equipment.

    Type

    Specifications

    • It screws directly into the modular valve pressure sensing port of the hydraulic circuit.

    • A dedicated throttle for absorbing pulsating pressure and surge pressure is built into the pressure gauge stock.

    • Pressure gauges do not touch each other even when modular valves are stacked.

    • The viscous resistance of 100% glycerin liquid in a fully sealed pressure gauge provides better damping of needle movement due to mechanical vibrations.

      In addition, the movement of the Bourdon tube is damped, and the pulsating pressure absorption effect of the fluid is improved compared to conventional products.

    • 100% glycerin liquid lubricates wear parts such as bearings and gears inside the pressure gauge and improves the durability of the internal mechanism.

      It also prevents corrosion of internal parts.

    • Safety measures are taken so that even if the Bourdon tube breaks,

      the transparent plate on the front will not scatter and the hydraulic oil will escape from the safety cap.

    • A green safety mark is attached to the periphery of the transparent plate, making it easy to set the pressure range and set value.

    • As a selection criterion, select a pressure gauge with a maximum scale that is at least twice the pressure range you are using.

  • OPGΦ39 Specifications

    How to use the safety mark

    !Once the components for the Safety Mark are depleted, we will begin including the 'CR-39' coloring as a standard accessory.

    How to use safety mark

    Instruction for use

    • Mount the glycerin filled pressure gauge vertically.

      Depending on the mounting orientation other than vertical, the indication accuracy may be disturbed or the glycerin-filled liquid may leak.

    • Since the transparent front panel is made of polycarbonate (PC), avoid direct contact with organic solvents. Please use masking when painting.

    • Please refer to "Precautions when using 【Color-ring CR】" for handling  color-ring CR.

    • For ranges with a maximum scale of 1 MPa or less, cut off the tip of the safety cap before use.

  • 【OPGΦ39 In case of 1MPa or less】

    OPG 安全キャップ 最大目盛1MPa以下の場合

    For pressure gauges of 1 MPa or less, the torque of the Bourdon tube is weak, so temperature changes (internal pressure changes) inside the pressure gauge case affect the indication accuracy.
    By cutting the safety cap protrusion, the internal pressure and atmospheric pressure are balanced and accuracy is maintained.
    However, after cutting the safety cap, the glycerin liquid may leak, so be sure to use it with the safety cap facing upwards.

    【OPGΦ39 In case of range with a maximum scale of 2.5 MPa or more】

    Equipped with a high pressure safety cap without protrusions. No need to release internal pressure.

    Various certification documents related to pressure gauges

    Document download

    Drawing PDF download

    *Data is located on Google Drive. If you are unable to access Google Drive due to internal security reasons,
      we will send it as an email attachment, so please use the inquiry form (Contact Us) to request it.
    ▷If you would like CAD data or instruction manuals, please use the inquiry form.
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    ASK Co., Ltd. Hydraulic, Coolant Accessories&Measuring Instruments.