How to offset my temperatures (Temperature Deviation)
This article explains the steps of offsetting your temperatures when the temperatures in Cropster are not accurate in comparison to the readout on your roast machine.
Table of Contents
About the temperature deviation in general
- A slight deviation (up to 2°C/4ºF) can be normal depending on your setup (see below).
- If the deviation is static (stays the same throughout the roast), an offset can be added within the Roasting Intelligence (RI) preferences.
Static vs. dynamic deviation
Static deviation
When the deviation is static, meaning the difference in temperature stays the same throughout the roast, an offset can be added.
- Log in to Roasting Intelligence (RI).
- Navigate to the
Preferences on the bottom left side of the screen. - Select the Machine tab > Measurements.
- Select the dropdown for the measurement where you want to apply the temperature adjustment.
-
Add the difference in temperature to the Offset field under the affected temperature measurement.
Dynamic deviation
When the deviation is dynamic, meaning the temperature difference varies throughout the roast, focus on one readout (preferably the Cropster readout) only.
If the temperature deviation is significant, please contact us by creating a support ticket.
Cropster Connector
If your roast machine is connected with the help of a Cropster Connector (Phidget), we have to differentiate how the probes are connected to the Cropster Connector.
Splicing connection
There are many potential error sources when setting up a splicing connection.
The first step is to redo the splicing connection. The wires have to be twirled very firmly. If they are too loosely twirled, a deviation is very likely.
Dual probes
A dual probe has two temperature sensors on the inside.
One sensor is connected to the two leads that go into the machine's readout, and one sensor is connected to the two leads that go into Cropster.
Since the two sensors are measuring the temperature independently of each other, the temperatures are not completely aligned. A deviation of +-2°C/4ºF is likely.
Independent probe next to an existing probe
When there is an additional probe next to an existing probe installed, a deviation is very likely.
Two independent sensors are measuring the temperature.
The following variables can have an impact on the deviation:
- Probe placement
- Sheath thickness
- Batch size
- Probe age
Countermeasures
Probe type
Is the probe type correctly assigned within the Roasting Intelligence (RI)?
- Navigate to thePreferences on the bottom left side of the screen.
- Select the Machine tab > Configuration.
- Check the Probe Type.
Check the ends of your thermocouple wires. From the colored coating of the wires, you can deduct the type of thermocouple.
The physical connection
Make sure all wires are connected correctly.
The thermocouple leads have a positive and negative wire.
Ensure that all positive wires are connected and go into the positive port of the Cropster connector, and the same for the negative wires.
Congratulations! You are now ready to offset your temperatures.
Your opinion matters. If you have further questions, feedback, or concerns, please submit a support ticket directly from support.cropster.com.