SplitHops
Member
I wanted to pass this along to anyone using this version of Digital Controller.
Installation using PT100 adn an RTD sensor cable with three leads.
K thermocouples rarely have more than 2 wires so you likely have a RTD type.
first, if you have a VOM measure the resistance of the sensors.
It should be between about 50 ohms and 150 ohms between red and silver wires
and about 0 ohms between the 2 red wires.
If not then the sensors are not PT100 and will not work with the TA4.
either get PT100 RTD sensors or replace TA4s with compatible Units.
Now for the connections:
Silver wire to BOTH pins #8 and #9. <---- important!!!!
One red wire to pin # 7.
The other red wire to pin #10.
Set Unit to PT100.
Let me explain.
A RTD sensor is simply a resistor that changes resistance with temperature.
There are a number of similar devices PT50, PT100, PT1000, PT10000
The number indicates the nominal resistance of the sensor at 0º C.
The sensor is between the silver and red wires.
There are 2 red wires connected at the sensor, they allow for compensating for the resistance of the wires.
The unit senses the extra resistance along the red wires and subtracts it from the resistance it sees between the silver and red. This allows for long wire runs where wire resistance would effect accuracy.
Installation using PT100 adn an RTD sensor cable with three leads.
K thermocouples rarely have more than 2 wires so you likely have a RTD type.
first, if you have a VOM measure the resistance of the sensors.
It should be between about 50 ohms and 150 ohms between red and silver wires
and about 0 ohms between the 2 red wires.
If not then the sensors are not PT100 and will not work with the TA4.
either get PT100 RTD sensors or replace TA4s with compatible Units.
Now for the connections:
Silver wire to BOTH pins #8 and #9. <---- important!!!!
One red wire to pin # 7.
The other red wire to pin #10.
Set Unit to PT100.
Let me explain.
A RTD sensor is simply a resistor that changes resistance with temperature.
There are a number of similar devices PT50, PT100, PT1000, PT10000
The number indicates the nominal resistance of the sensor at 0º C.
The sensor is between the silver and red wires.
There are 2 red wires connected at the sensor, they allow for compensating for the resistance of the wires.
The unit senses the extra resistance along the red wires and subtracts it from the resistance it sees between the silver and red. This allows for long wire runs where wire resistance would effect accuracy.
