You also need to tell the resolution you require is it 130 or 130.0 and counter upto 9999 ? what are the controls you want and the outputs required if any.The circuit you require is possible, what is the time frame within which you require it ? i can design above with simple analog-digital based circuits, microcontroller based designs will take much more time but can be upgraded easily.
You also need to tell the resolution you require is it 130 or
130.0 and 130 1%
counter upto 9999 ? at least 0-999
what are the controls you want and the outputs required if
a reset for counter and I would like the temp sensor to have 4 sensors so I could surround a pipe and any sensor would trigger circuit. The unit would be mounted about 6-8 inches away from sensors. Thinks a probe type sensor so it can protrude from a plastic tube that will be shaped to meet pipe or vent design.
i can design above with simple analog-digital based circuits,
microcontroller based designs will take much more time but can
be upgraded easily.
No upgrade needed only the sensor mounting locations will be needed at this point.
I might not need AC if the circuit can be powered from 9 VDC battery like a Smoke detector.
Hope this helps. This unit is more for troubleshooting a air
flow problem. If the counter shows many 130 Degrees detected
or alarm is going off several times a higher priced system for
a forced air flow will be needed. Currently no way to detect
heat increases going around vent so client doesn't want to
purchase forced air flow system. This is a safety device so
client can decide on this cheaper system to monitor or a more
expensive permanent fix. I will need a PCB setup after I can
test the circuit in test environment.
The temperature in a pipe is monitored with four RTD Pt-100 Sensors, The type of probe could be Extruder RTD probes with Bayonet or Compression Fitting, Get it from Omega. The temperature at four points are measured by Temperature Module and compared with one setpoint 0-200 deg C, an alarm output LED out-a goes ON when the measured temperature exceeds the common setpoint.
a. do you need individual setpoints for all the four points
you measure ?
b. is the temperature deg C or deg F, centigrade or
c. do you need a relay output when the LED goes ON to turn
off the heater ?
d. the time taken to measure 4 points will be 4 seconds is
that fast enough ?
e. do you need a display of the measured temperature as shown
The Analog Timer Module can be set from 0- 30 minutes. If out-a remains high even after set time a out-b alarm goes on with a relay output, the relay contacts can be used to turn off a heater or sound a buzzer.
a. do you want to use a digital timer instead ?
I'm open. Trying to keep costs down
b. do you need a solid state relay output ?
Used like a smoke detector. Alarm to notify client to check air flow. This is in case the air flow stops.
Whenever out-a goes high and low the Counter Module counts
from 0000 to 9999. The counter can be reset at any time by
pressing a button. This will count the number of times
temperature in pipe went above the setpoint.
a. do you need a preset like "150 times" for the counter to sound an alarm ?
NO The alarm should sound if temp is 130 or above and stays that way for 3 minutes.
20th Mar 2020
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