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UPDATED
A bro told me that the last photo cannot be seen, so I have re-uploaded the photo and changed the link.
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All thanks to the help from the various bros, I have managed to modify my Haliea 150A chiller to use an external temperature probe. Just want to share with other bros who are interested in this DIY. The modification took me less that 20min.
The external temperature probe/sensor was purchased from Sim Lim Tower (NOT Sim Lim Square) B1. It is the shop near the escalator, just ask if they sell Fox temperature controllers.
Sim Lim Tower Acez Instrument Pte Ltd, #B1-38Bros here have successfully used 2 similar models (same price), FN-200N's replacement temperature probe which has a long metal probe/sensor or a NTC based plastic temperature probe/sensor. I have bought the latter, picture as shown below.
First remove the front panel of the Haliea 150A chiller by pulling from the bottom of the panel.
Next use your fingers (both hands will be easier) to reach behind the display panel to locate 2 tabs and press them down and push out the front panel.
The 2 tabs which I am refering to are circled below.
You can see that there is a pair of wires (red and black) which is connected to the internal water tank's temperature probe/sensor. Disconnect the connector (circled below) and attach the external temperature probe/sensor to it (attach to the end that is connected to the display panel).
To attach the external temperature probe/sensor to the connector, you can use soldering iron to solder the points together or use those electrical connector blocks
. Some bros even managed to buy the same connector from shops in Sim Lim Tower top floor and pay the shops to fix up the connector.
Note that for the NTC based plastic temperature probe/sensor, you need to connect the wire with white words to the red wire and the other plain black wire to the black wire.
You can calibrate your chiller to match your tank's temperature by pressing and hold the Up and Down arrows together. Maximium is +1.5Deg and -1.5Deg