Liquid flow switch rpzh-8
Liquid flow switch rpzh-8 non-contact liquid flow switch - for continuous monitoring of the presence of liquid flow. When the liquid supply is interrupted or the flow rate drops below the set value, a discrete signal appears (relay contacts closure) at the output from the device. The liquid flow switch of the RPZh-8 type is produced according to TU 25-02.521487-80 and is used to switch electrical circuits when the set water flow rate is reached and are used to monitor the presence of water flow in cooling systems of various equipment (for example, electrothermal) with an open drain. RPZh-8 technical characteristics a) in terms of resistance to climatic factors of the external environment: - UHL performance category 4 in accordance with GOST 15150-69, but for operation at temperatures from 1 to 60 ° C; b) in terms of water resistance - B2 according to GOST 17786-72; c) in terms of resistance to external vibration influences - version I in accordance with GOST 17167-71 1. The upper limit of the setting (setting) with a decrease in flow rate - 5 l / min. 2. The lower limit of the RPZh-8 setting (settings) with a decrease in flow rate - 2l / min. 3. The upper limit of the setting (setting) with increasing flow rate - 8l / min. 4. The lower limit of the setting (setting) with increasing flow rate - 4l / min. 5. The difference between the flow rates corresponding to the actuation of the relay in either direction is not more than 2.5 l / min. 6. Scatter of operations - no more than 0.5 l / min. 7. Working medium - industrial water with parameters: - RN 8.5; suspended solids 19mg eq / l in terms of 22gr.S. - operating temperature range - from 5 to 700C 8. Nominal voltage of alternating current RPZh-8 with a frequency of 50 or 60Hz - 380 / 220V 9. Nominal voltage of direct current with a frequency of 50 or 60Hz - 220V. 10. Rated current of continuous operation, A - 2.5. 11. Relay weight - no more than 0.25 kg. 12. Overall dimensions - no more than 154 * 78 * 40mm. RPZh-8 principle of operation When liquid is supplied to the relay input, the pressure under the membrane rises and the membrane, overcoming the spring force, breaks away from the nozzle, opening the fluid passage and turning the lever that approaches the microswitch rod. When the flow rate rises to the set value, the microswitch is triggered, giving an electrical signal. When the flow rate through the RPZh-8 relay decreases, the pressure under the membrane decreases and the lever under the action of the spring turns in the other direction, releasing the microswitch rod (the microswitch is triggered in the opposite direction). Thus, the flow rate at which the microswitch is triggered depends on its position. When the adjusting screw is fully turned, the lever rests against the cover and the gap between the lever and the microswitch rod is minimal. This position corresponds to the operation of the RPZh-8 relay at a minimum flow rate. When the adjusting screw is unscrewed, the microswitch under the action of the spring rotates into the gap between the lever and the microswitch rod increases. In this case, the actuation will occur at a higher flow rate.
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