MKC OIL SIGNAL indicators add a CAC902 protective cover to a visual oil-flow indicator. The moving ball or float makes flow presence visible, while the cover helps protect the tube in installations exposed to piping distortion or vibration. Threaded model flow examples are specifically based on VG68 oil at 40°C.
Construction and operating specifications
| Parameter | Specification |
|---|---|
| Fluid | Oil |
| Maximum temperature | 80°C |
| Pressure resistance | 1 MPa |
| Transparent tube | Acrylic |
| Fittings | C3604 brass |
| Spring | SUS304 |
| Ball | Nylon 66; cylindrical float may be used depending on specification |
| Protective cover | CAC902 |
| O-ring | Nitrile rubber, standard version |
| Threaded connection options | Rc female standard; R male or mixed arrangements on request |
| SUS fitting option | Available on request for the threaded version |
| Heat-resistant option | Pyrex glass tube and fluororubber O-ring; confirm the required temperature rating |
What the visual indication means
The ball or float responds to the fluid passing through the transparent tube, giving a direct visual indication of oil movement. This family does not provide a quantitative flow reading. The threaded-model minimum and maximum values below are examples for VG68 oil at 40°C. Oil viscosity and temperature affect the indication, so the same apparent ball movement must not be treated as a transferable L/min calibration for another oil or temperature. Copper-tube rows, where present, retain the separately listed maximum-flow values.
Threaded models and dimensions
| Model | Port | Length (mm) | Width (mm) | Depth (mm) | Example minimum flow: VG68 at 40°C (L/min) | Example maximum flow: VG68 at 40°C (L/min) |
|---|---|---|---|---|---|---|
| MKC20-1TL | Rc1/8 | 80 | 30 | 22 | 0.3 | 5 |
| MKC20-2TL | Rc1/4 | 80 | 30 | 22 | 0.3 | 5 |
| MKC20-3TL | Rc3/8 | 86 | 30 | 22 | 0.3 | 5 |
| MKC30-2TL | Rc1/4 | 100 | 44 | 32 | 1.5 | 10 |
| MKC30-3TL | Rc3/8 | 104 | 44 | 32 | 1.5 | 10 |
| MKC30-4TL | Rc1/2 | 110 | 44 | 32 | 1.5 | 10 |
| MKC35-4TL | Rc1/2 | 124 | 49 | 44 | 2 | 25 |
| MKC35-6TL | Rc3/4 | 124 | 49 | 44 | 2 | 25 |
| MKC45-6TL | Rc3/4 | 142 | 62 | 50 | 5 | 50 |
| MKC45-8TL | Rc1 | 142 | 62 | 50 | 5 | 50 |
Copper-tube models and dimensions
| Model | Copper tube OD (mm) | Length (mm) | Width (mm) | Depth (mm) | Maximum flow (L/min) |
|---|---|---|---|---|---|
| MKC20-4 | φ4 | 98 | 30 | 22 | 1.5 |
| MKC20-6 | φ6 | 100 | 30 | 22 | 4 |
| MKC20-8 | φ8 | 102 | 30 | 22 | 5 |
| MKC20-10 | φ10 | 107 | 30 | 22 | 5 |
| MKC30-10 | φ10 | 126 | 44 | 32 | 10 |
| MKC30-12 | φ12 | 126 | 44 | 32 | 10 |
| MKC30-14 | φ14 | 135 | 44 | 32 | 10 |
All dimensions are in millimetres. Select the complete model and connection rather than the nominal body size alone. Casting-based housings can have individual dimensional variations; check the product drawing and mounting clearance before installation.
Installation and operating checks
The spring-supported design allows upward, downward or sideways mounting. This flexibility concerns the mounting orientation; connect the inlet and outlet according to the intended flow path. Keep the viewing area accessible so the oil movement can be inspected during operation. Check the specified temperature and pressure limits against the actual oil circuit and verify material compatibility with the oil. Inspect the transparent tube, fittings and any seals for leakage or damage, and confirm visible oil movement after commissioning. A visual indicator supplies local information; any required automatic shutdown or remote alarm must be specified as part of the system design.
The threaded-series heat-resistant option uses a Pyrex glass tube and fluororubber O-ring. The standard page does not assign a numerical maximum temperature to that special option, so obtain the intended rating before selecting it for higher-temperature service. The standard acrylic version remains limited to the listed 80°C.
Product and dimensional illustrations
Information to provide when ordering
Specify the complete model or configured series, oil type or viscosity, normal delivery conditions, inlet and outlet connections, and available mounting space. For copper-tube models, state the tube outside diameter. For threaded models, distinguish R male from Rc female connections.