Matters needing attention in application of water flow switch |
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with intermediate relay:
Intermediate relay is a kind of electronic control
device which has control system (also known as input circuit) and controlled
system(also known as output circuit),it is usually applied to automatic control
circuit, in fact, it is also a kind of automatic switch which use low current to control high current.So intermediate
relay fulfill the functions of automatic adjustment,safety protection,
switching circuit .
Water flow switch is regularly used with
intermediate relay in application.Some clients often meet some questions during
using our water flow switch.For example,wiring
method, the power and voltage selection of relay and so on.This passage will
present the simple ,practical introductions and analysis for how to wire the
relay,selecting the suitable power and voltage of relay,to help the clients who
use water flow switches answer the above questions.
a.The moldings judgement of relay and relations
between moldings: Generally, there are labels on the shell of the relay,if
not,we can use multimeter to detect on our own.5V power source and multimeter
are needed.
Steps:
1. Find the coil pin
Detect resistor between
the coil pins with multimeter, the two moldings are coil pins with the
resistance range from 100 to 1000 MΩ.Please note that there are positive and negative poles of the coil in
some relays.Backing coil will have no damage to the relay,but will have failure
to actuate.
2.Find normally open and
normally closed points
Except for the coil, detect the four pins with
multimeter, if the two pins breakover, they are normally closed. Connect the
coil with 5V direct current, make the relay operating,then the two pins should disconnect.If not, they are
shorted inside.Connect the coil with 5V direct current,make the relay
operating, then use multimeter to detect,if
the two pins which don’t breakover before,but now they breakover, it proved that they are normally open.
3.Common terminal is the pin which is related to
normally open and normally closed points.
4.In the terms
of power and voltage of relay,we usually produce water flow switch with 10W and
70W ,so accordingly,the power and voltage of relay must match with the
power of the water flow switch.We suggest
that clients should use 3W relay with voltage of DC12V or DC24V.Please don’t connect the serial circuit of the
electrical directly, so as not to burn out.
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