0
\$\begingroup\$

I have two monitors I want to connect to one temperature sensor. I tried connecting the sensor wires in parallel but it only outputs error. Sometimes the power doesn't even turn on. I'm guessing the signal can't be split in multiples. Anyone have an idea on how to read a single sensor to multiple monitors? What do I need? What do I have to purchase?

Temperature sensor using MF55 type of NTC thermistor, epoxy potting.

Operating voltage: 4.5-28V

Here is more info on the monitor.

enter image description here

enter image description here

enter image description here

\$\endgroup\$
10
  • 3
    \$\begingroup\$ You need to be clear on what type of "temperature sensor" you are using. Is this a thermocouple? RTD? PT100, PT1000? Type-J/K...? Also be clear on what type of "monitor" you are using is. \$\endgroup\$
    – Ron Beyer
    Commented Mar 10, 2021 at 18:51
  • 1
    \$\begingroup\$ NTC thermisters require an excitation voltage. Both meters trying to excite in parallel will not work. \$\endgroup\$ Commented Mar 10, 2021 at 19:05
  • 1
    \$\begingroup\$ You could very well damage your equipment with this attempt. \$\endgroup\$
    – Eugene Sh.
    Commented Mar 10, 2021 at 19:24
  • 1
    \$\begingroup\$ Does other types of thermistors allow parallel? Is there a way to network the signal? \$\endgroup\$ Commented Mar 10, 2021 at 19:27
  • 3
    \$\begingroup\$ I would take the most inexpensive solution and use two probes, they you have a backup reading incase one fails. the parts and your labor will cost a lot more then the second meter. You can purchase commercial equipment that will do this for you. \$\endgroup\$
    – Gil
    Commented Mar 10, 2021 at 21:20

3 Answers 3

1
\$\begingroup\$

You can have two readouts from one sensor by connecting the sensor to a transmitter. The transmitter does not need to have its own readout but it can send a 4 to 20 mA signal to two indicating meters connected in series.

You need to look carefully at the specifications to assure that the meters are designed to be connected in series. You also need to determine if the transmitter has a built-in power supply or it that much be purchased separately.

Here are examples of a 4-20 mA temperature transmitter and a loop-powered indicating meter.

Transmitter

Meter

\$\endgroup\$
2
  • \$\begingroup\$ Can you show me an example, please? \$\endgroup\$ Commented Mar 10, 2021 at 22:06
  • \$\begingroup\$ See addition to answer. \$\endgroup\$
    – user80875
    Commented Mar 10, 2021 at 22:41
1
\$\begingroup\$

it looks like the back board contains a power supply and some resistors and the the front board contains the display circuit

something you could try would be to disconnect the thite wire of the triple wires from one meter and connect it to the white of the other. that should make both meters display the same value.

\$\endgroup\$
0
\$\begingroup\$

Looks like they're using a 10K NTC thermistor.

You can try removing R11 (0 ohm) from one of the two meters and see if that works. They may not read exactly the same but it should be reasonably close.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.