Product Overview
The Madison M5000 is a miniature float switch designed for reliable liquid level detection. Constructed from 316 stainless steel, it is suitable for a wide range of applications, including those requiring superior corrosion resistance, high temperatures, or use in medical, petrochemical, and food processing environments. This sensor detects high or low liquid levels within a container.
Figure 1: Madison M5000 Liquid Level Sensor. This image shows the stainless steel float switch with its threaded stem and electrical lead wires extending from the top. The main body is cylindrical, designed to float or sink with liquid levels.
Safety Information
Before installation and operation, read and understand all instructions. Failure to do so may result in product damage, property damage, or personal injury. Ensure all electrical connections comply with local and national electrical codes. Disconnect power before installing or servicing the sensor.
- Do not exceed the maximum pressure and temperature ratings of 300 PSI and 392°F (200°C).
- Ensure the sensor is rated for the specific liquid and environment it will be used in.
- Switches are rated for resistive loads. Refer to UL guidelines for current (Amperes resistive) at different voltages.
Setup and Installation
The M5000 sensor is designed for vertical mounting using its 1/8" NPT thread. It can be installed to detect either high or low liquid levels depending on its orientation.
Mounting Orientation:
- Normally Open (NO) Operation: For high-level detection, mount the sensor so the float is at the bottom and rises with the liquid. The switch will close when the liquid reaches the float.
- Normally Closed (NC) Operation: For low-level detection, mount the sensor so the float is at the top and falls with the liquid. The switch will open when the liquid drops below the float.
Installation Steps:
- Identify the desired mounting location in the container, ensuring it is clean and free of debris.
- Thread the 1/8" NPT stem into the appropriate port. Use a suitable sealant (e.g., PTFE tape) on the threads to ensure a leak-proof seal. Do not overtighten.
- Connect the 24", 22 AWG Teflon insulated lead wires to your control circuit. Refer to the electrical specifications for appropriate voltage and current ratings.
- Verify the float moves freely without obstruction within the container.
Operating Principles
The Madison M5000 operates on a simple magnetic principle. Inside the stainless steel stem, there is a hermetically sealed reed switch. The float, which contains a magnet, moves along the stem as the liquid level changes. When the magnet in the float comes into proximity with the reed switch, it causes the switch contacts to open or close, signaling the liquid level status to the connected control system.
The float has a specific gravity (SG) of 0.70, meaning it will float in liquids with an SG greater than 0.70. For liquids with an SG less than 0.70, the float will sink, and the sensor's operation will be inverted.
Maintenance
The Madison M5000 liquid level sensor is designed for minimal maintenance due to its robust stainless steel construction. However, periodic inspection is recommended to ensure optimal performance.
- Cleaning: If the sensor is used in applications with viscous or particulate-laden liquids, the float and stem may accumulate residue. Periodically clean the float and stem to ensure free movement. Use cleaning agents compatible with 316 stainless steel.
- Inspection: Check the lead wires for any signs of damage or wear. Ensure the NPT connection remains secure and leak-free.
- Functionality Test: If possible, periodically test the sensor's operation by manually raising or lowering the liquid level (or simulating it) to confirm the switch activates correctly.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Sensor not activating |
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| Intermittent readings |
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| Leakage at mounting point |
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Specifications
| Parameter | Value |
|---|---|
| Model Number | M5000 |
| Stem Material | 316 Stainless Steel |
| Float Material | 316 Stainless Steel |
| Float Specific Gravity (SG) | 0.70 |
| Mounting Thread | 1/8" NPT |
| Max Pressure | 300 PSI |
| Max Temperature | 392°F (200°C) |
| Switch Rating | 30 Watt, SPST (Single Pole, Single Throw) |
| Electrical Ratings |
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| Lead Wires | 24", 22 AWG, Teflon Insulated |
| Approvals | CE, UL, NSF |
| Product Dimensions | 9.06 x 6.3 x 7.09 inches; 1.6 ounces |
Note: Switches are rated for resistive loads. Refer to UL guidelines for current (Amperes resistive) at different voltages.
Warranty Information
Specific warranty details for the Madison M5000 Liquid Level Sensor are typically provided at the point of purchase or can be obtained directly from Madison Company. Please retain your proof of purchase for warranty claims.
Support and Contact
For technical assistance, troubleshooting beyond this manual, or inquiries regarding parts and service, please contact Madison Company directly. Contact information can typically be found on the manufacturer's official website or product packaging.
Manufacturer: Madison Company
