MKCT OIL SIGNAL indicators combine a transparent tapered tube with a metal protective cover. The float or ball position gives an approximate flow indication, while the cover reduces exposure of the tube to accidental contact. The range includes threaded models up to a catalog maximum of 50 L/min and separate copper-tube models.
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 | BC |
| 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 |
| Copper-tube fittings | C3604 brass cap nuts and Cu chuck sleeve |
Approximate flow indication
The tapered transparent passage and moving ball or float allow the approximate flow to be assessed against a reference indication. Specify the oil type or viscosity and normal flow when selecting the assembly, because the response depends on the fluid conditions. The catalog maximum-flow figure is not an accuracy specification or an electronic switch setpoint. The visual arrangement is useful when a local oil-flow check is required without an electrical flow-switch output.
Threaded models and dimensions
| Model | Connection | Length (mm) | Width (mm) | Depth (mm) | Maximum flow (L/min) |
|---|---|---|---|---|---|
| MKCT20-1TL | Rc1/8 | 80 | 30 | 22 | 5 |
| MKCT20-2TL | Rc1/4 | 80 | 30 | 22 | 5 |
| MKCT20-3TL | Rc3/8 | 86 | 30 | 22 | 5 |
| MKCT30-2TL | Rc1/4 | 100 | 44 | 32 | 10 |
| MKCT30-3TL | Rc3/8 | 104 | 44 | 32 | 10 |
| MKCT30-4TL | Rc1/2 | 110 | 44 | 32 | 10 |
| MKCT35-4TL | Rc1/2 | 148 | 50 | 44 | 25 |
| MKCT35-6TL | Rc3/4 | 148 | 50 | 44 | 25 |
| MKCT45-6TL | Rc3/4 | 171 | 62 | 50 | 50 |
| MKCT45-8TL | Rc1 | 171 | 62 | 50 | 50 |
Copper-tube models and dimensions
| Model | Connection | Length (mm) | Width (mm) | Depth (mm) | Maximum flow (L/min) |
|---|---|---|---|---|---|
| MKCT20-4 | φ4 | 98 | 30 | 22 | 1.5 |
| MKCT20-6 | φ6 | 100 | 30 | 22 | 4 |
| MKCT20-8 | φ8 | 102 | 30 | 22 | 5 |
| MKCT20-10 | φ10 | 107 | 30 | 22 | 5 |
| MKCT30-10 | φ10 | 126 | 44 | 32 | 10 |
| MKCT30-12 | φ12 | 126 | 44 | 32 | 10 |
| MKCT30-14 | 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.
Alternative connection designations
| Published connection-variant example | Connection arrangement |
|---|---|
| MKCT20-3TOL | R male connections at both ends |
| MKCT20-3TOML | R male inlet connection |
| MKCT20-3TMOL | R male outlet connection |
These are ordering examples for alternative threaded arrangements. Confirm the dimensions and availability for the requested fitting arrangement; the standard TL dimensional row must not be assumed to cover every modified connection.
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.
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.