Can I use a Reactor without a hose thermocouple (FTS)?

This is a question we are often asked. The answer is: Yes, at least in some cases. In this article we explain when and how you can spray without a hose thermocouple.

Because the fluid temperature sensor (FTS) of the Graco Reactor is a sensitive device, it is often the first part of the system to break down in the event of misuse by the operator. It is the main reason why people ask us the question: “Can I use my reactor without the FTS?”.

Whether you can use a Graco Reactor without the fluid temperature sensor depends on your Reactor type and software version.

• Do you have a Graco Reactor 2 with the latest software version? Yes, you can use a Reactor without the FTS (see further instructions below).
• Do you have a Graco Reactor 1? No, you will need to use the FTS at all times.

What is Resistance Control Mode (RCM)?

Resistance Control Mode (RCM) is Graco’s heated hose temperature control technology that automatically controls the average fluid temperature of the A and B material.

RCM uses the electrical resistance of the hose heating element to monitor the hose temperature. As the temperature changes, the electrical resistance will change with it. The Reactor monitors how the resistance of the hose changes in order to calculate the actual temperature.

Using the Resistance Control Mode to automatically control the hose temperature eliminates the risk of broken RTD cables and fluid temperature sensors, resulting in less downtime, less repair costs and increased productivity.

For more information, please read the Graco Reactor 2 manual  (333023, p. 50) and this article about Resistance Control Mode.

Refer to the manual for further directions: