MKCT WATER SIGNAL indicators add a metal protective cover around a transparent tapered tube. The ball or float position gives an approximate indication of water flow. Ten threaded TW models cover four catalog standard-flow groups, with different connection sizes and axial dimensions for the 20, 30, 35 and 45 body families.
Construction and operating specifications
| Parameter | Specification |
|---|---|
| Fluid | Water |
| Maximum temperature | 80°C |
| Pressure resistance | 1 MPa |
| Mounting orientation | Upward, downward or sideways; observe the intended flow direction |
| Transparent tube | Acrylic |
| Fittings | C3604 brass |
| Spring | SUS304 |
| Ball | Nylon 66; a cylindrical float may be used depending on specification |
| O-ring | Nitrile rubber, standard version |
| Protective cover | BC |
| Standard connection | Rc female; R male or mixed arrangements on request |
| SUS fitting option | Available on request |
Approximate indication
Water flowing through the transparent tapered tube displaces the internal ball or float. Its position relative to the reference indication supports approximate flow checking at the installation. This arrangement is useful for local checks when a simple visible indication is sufficient. The published flow values guide selection, and no measuring-accuracy value is assigned here.
The table lists approximate standard-flow ranges. If the required flow falls outside those standard values, specify the duty for a special selection rather than extending the range by assumption. The standard flow-curve information applies to the standard construction; modified fittings or special internals require confirmation of the relevant characteristic.
Complete water-model dimensions and flow data
| Model | Port | Length (mm) | Width (mm) | Depth (mm) | Approx. standard flow (L/min) |
|---|---|---|---|---|---|
| MKCT20-1TW | Rc1/8 | 80 | 30 | 22 | 1 to 5 |
| MKCT20-2TW | Rc1/4 | 80 | 30 | 22 | 1 to 5 |
| MKCT20-3TW | Rc3/8 | 86 | 30 | 22 | 1 to 5 |
| MKCT30-2TW | Rc1/4 | 100 | 44 | 32 | 4 to 17 |
| MKCT30-3TW | Rc3/8 | 104 | 44 | 32 | 4 to 17 |
| MKCT30-4TW | Rc1/2 | 110 | 44 | 32 | 4 to 17 |
| MKCT35-4TW | Rc1/2 | 148 | 50 | 44 | 8 to 30 |
| MKCT35-6TW | Rc3/4 | 148 | 50 | 44 | 8 to 30 |
| MKCT45-6TW | Rc3/4 | 171 | 62 | 50 | 10 to 40 |
| MKCT45-8TW | Rc1 | 171 | 62 | 50 | 10 to 40 |
All 10 listed standard water-model entries are retained. Dimensions are in millimetres and flow values are in L/min. The full model, connection and required installation envelope must be checked together. TW identifies the water-series order form shown in these tables.
Cast protective housings can show individual dimensional variations at the casting surface. Check the installation drawing and available clearance, particularly overall width, before machining a mounting arrangement.
Alternative threaded ordering examples
| Published connection-variant example | Arrangement |
|---|---|
| MKCT20-3TOW | R male connections at both ends |
| MKCT20-3TOMW | R male inlet |
| MKCT20-3TMOW | R male outlet |
These codes are examples of alternative connection arrangements. Confirm the dimensions and availability for the requested version; do not assume that every modified fitting has the same installed length as the standard TW model.
Materials, temperature and options
The standard water construction uses an acrylic tube, C3604 brass fittings, SUS304 spring, Nylon 66 ball and nitrile-rubber O-ring. A cylindrical float may be used according to the selected specification. The standard maximum temperature is 80°C and pressure resistance is 1 MPa. These operating limits do not establish a numerical indication accuracy or extend the selected model’s flow capacity.
Installation and commissioning
The spring-supported construction allows upward, downward or sideways mounting. This concerns orientation, not interchangeability of the inlet and outlet: follow the intended flow path and selected fitting arrangement. Keep the viewing area accessible. Match the actual water conditions and required flow with the selected model, check the pipe connection and material compatibility, and inspect for leakage or tube damage after installation. Observe water movement under normal operating conditions and use separate instrumentation where a precise flow value or automatic alarm is required.
Product and dimensional illustrations
Ordering information
Specify the complete water-series model, inlet and outlet thread forms, normal water flow, operating temperature and pressure, and available installation space. State any flow requirement outside the published standard values for a specific selection. State any SUS fitting or heat-resistant construction required.