Monitoring A Waterflow Switch: A Step-By-Step Guide

Monitoring a workflow switch involves tracking the execution of workflows and tasks assigned to the workflow. This can be done through a Workflow Monitor, which provides details such as the name of the person who started the workflow, the date and time the workflow started and was last run, the name and link to the document or item involved, the current status of the workflow, and the option to terminate it. To monitor a workflow, one can expand an application in the Navigator and select the Workflows folder, which will display a list of workflow instances and their properties. This allows for the viewing of logs, context, cancellation or abortion, and recovery of the workflow instance. Additionally, background workflow processes can be monitored by accessing System Job rows, which track their status, and real-time workflow processes can be monitored by enabling logging for errors.

How to test a waterflow switch

A water flow switch is an electro-mechanical device that monitors the flow of water in a fire sprinkler system. It is designed to send a signal to a local alarm, monitored panel and/or fire department when a continuous flow of water is detected, indicating either an activated sprinkler head or a leak in the system. Testing a water flow switch involves the following steps:

• Ensure the system is on test and bypassed.
• Flow water from the inspector's test valve (ITV) on each floor.
• Check the time delay on the switch.
• Verify that the switch operates with the smallest orifice of the sprinkler system.
• Confirm that the switch sends a signal to the alarm panel and bell.
• Inspect the lid tamper wiring.
• Adjust the dial knob on the switch to ensure the correct delay is set.
• Clean the inside spring mechanism to remove any particles and prolong the lifespan of the component.
• Use an ohmmeter to measure the resistance of the switch's electronics. Attach the ohmmeter to the wires extending from the switch and push the plunger in the direction of the water flow. If the ohmmeter does not show continuity, replace the switch.
• Regularly test the flow switch in accordance with relevant standards and regulations, such as quarterly testing as per BS EN12845 or TB203.3.2.

Where to install a waterflow switch

When installing a water flow switch, there are several factors and guidelines to consider to ensure optimal performance and accuracy. Here are some detailed instructions on where to install a waterflow switch:

Firstly, it is important to choose an appropriate location for the waterflow switch, considering accessibility and potential interference from nearby activity. The switch should be mounted in an area that provides adequate space for servicing and maintenance while being protected from damage caused by the surrounding environment or activities.

For vertical pipes, the waterflow switch should be installed where there is an upward flow of water. This ensures that the switch can accurately detect the flow and minimise the risk of rust or particle accumulation interfering with its operation.

When installing on a horizontal pipe, mount the waterflow switch on the top to prevent any potential blockage or interference from rust or particle accumulation.

It is recommended to maintain a distance of at least six to seven feet above the ground when installing the waterflow switch. This height ensures that the switch is easily accessible while being protected from potential damage or accidental activation.

Additionally, maintain a distance of at least six inches from fittings that alter the direction of water flow. Keep the switch at least two feet away from drains or valves to prevent any interference or false readings.

When dealing with pipe bends, fittings, valves, or any elements that could cause a disturbance in the flow, it is crucial to install the waterflow switch in a straight section of the pipe. Ensure that there is a minimum of ten diameters upstream and a minimum of five diameters downstream of the switch to minimise the impact of flow disturbances.

If the installation is underground, consider providing access to the switch by installing a valve box or meter pit. This accessibility measure will make it easier to perform maintenance or repairs if needed.

By following these guidelines and consulting with qualified professionals, you can ensure that your waterflow switch is installed correctly and functions optimally.

How to prevent false alarms

False alarms can be a frustrating issue for water flow switches, and there are several strategies to prevent them. Here are some tips to minimise false alarms:

• Set an appropriate delay: Adjust the timer on the water flow detector to delay the alarm-triggering mechanism. This ensures that a brief change in water flow, such as a surge in water pressure, does not trigger a false alarm. The delay can be set between 0 and 90 seconds, depending on the specific system and requirements.
• Optimal placement: Mount the water flow detector in an area with adequate space for servicing and away from normal nearby activity that could cause damage. Follow general installation guidelines, such as mounting the switch six to seven feet above the ground, on the top of a horizontal pipe, and at least six inches from fittings that change the water flow direction.
• Regular maintenance: Conduct regular inspections and maintenance of the water flow switch and the entire sprinkler system. Replace the switch if it shows signs of wear and tear, leaking, or malfunction. Test the system regularly to identify and address any potential issues.
• Address air bubbles: Air bubbles in the sprinkler system can cause false alarms. Bleed the air out of the system, especially after draining and refilling. This can be done through bleeder valves, which should be installed at high points in the system. However, bleeding the air may not fix the problem entirely, as some air will remain in the system.
• Check for leaks: False alarms may be caused by water leaking out of the sprinkler system. Inspect the sprinkler pipes, heads, drain valve, and inspection valve for any signs of leakage. Address any leaks to prevent false alarms and ensure the system's effectiveness.
• Consult professionals: For complex or persistent false alarm issues, consult qualified fire protection contractors, sprinkler fitters, or alarm technicians. They can provide expert advice and solutions tailored to your specific system and requirements.

How to reset a waterflow switch

A waterflow switch is an electro-mechanical device designed to send a signal to a local alarm or monitored panel when a continuous flow of water occurs through a fire sprinkler system's piping. This could indicate a sprinkler head has been activated or there is a leak in the system.

To reset a waterflow switch, you should first turn off the unit and unplug it from its power source for 30 seconds. This will reset the control panel and should make the switch operational again. If this does not work, ensure the flow switch valve is open. If it is not, disconnect the cable, wait six seconds, and then plug it back in. Check the valve for any obstructions and remove if necessary.

If the water level in the system is lower than the jets, the flow switch will not work. The manual will indicate how much water the system should hold and how high the water level should be for the switch to function. If the water level is adequate, clean out the filter. Obstructions in the filter will stop the water flow and cause the flow switch to cut off the power.

If the above steps do not work, check the output and input pressure of the jets and filter. If the PSI levels are not set correctly, the unit will not work. If the unit is still not functioning, confirm that the LED indicator light under the pack cover is wired correctly. If the light is off, it will need to be rewired according to the instructions in the owner's manual or on the manufacturer's website.

If there are no issues with the LED indicator light, check for leaks in the tank's enclosure. If there are leaks, inspect the grommet and conduit fittings. Replace or tighten any that are leaking. If there are no issues with the conduit fittings and grommet, the flow switch is likely damaged and will need to be replaced by a qualified fire protection contractor.

How to choose the right waterflow switch

When choosing the right water flow switch, there are several factors to consider. Firstly, it is important to understand the specific application and requirements. Different types of water flow switches are available, each with unique features and suitability.

• Type of Media: Water flow switches are typically designed for liquids, specifically water. However, some switches can handle other media like gases or steam. It is important to select a switch suitable for the media you intend to monitor.
• Functionality: Water flow switches can be stand-alone units that only monitor flow rates, or they can be integrated into a flow meter, providing continuous flow measurement and additional functions. Consider whether you need a simple flow switch or the enhanced capabilities of a flow meter.
• Installation Method: Water flow switches can be classified as inline or insertion types. Inline switches are installed permanently within the piping system, requiring more complex installation and maintenance. Insertion switches, on the other hand, have external electronics and a probe or paddle that is inserted into the pipe.
• Technology Type: Water flow switches use different technologies, such as paddle, thermal, or variable area. Paddle switches use a physical probe or paddle to detect flow. Thermal switches employ a heated probe to measure flow based on heat dissipation. Variable area switches use a float inside a tube to measure flow. Each technology has its advantages and disadvantages, so choosing the right one depends on your specific needs.
• Performance Specifications: Consider the performance characteristics of the water flow switch, including maximum and minimum flow rate, liquid temperature, system pressure, pipe diameter, and connection type. Ensure that the switch can accommodate these parameters.
• Durability and Maintenance: Some water flow switches have moving parts that may require periodic maintenance and are more susceptible to wear and tear. Consider the durability and maintenance requirements of the switch, especially in harsh or contaminated environments.
• Cost: Water flow switches vary in price, depending on the technology, materials used, and additional features. Evaluate the cost of different options to fit within your budget.

By carefully considering these factors and consulting with experts in the field, you can choose the right water flow switch for your specific application, ensuring optimal performance, accuracy, and reliability.

Frequently asked questions