Scenario: Customer needs to wire a RST Thermistor String to RST DT2040 Logger.
Solution: Follow the steps in the guide below to do the job.
This document is intended to be a supplement to the DT Logger Host software manual as it assumes users have a basic understanding of setting up DT series data loggers with DT Logger Host software. please refer to the DT Logger Host Instruction Manual, Document Number ELM0080M, available for download at RST website: https://rstinstruments.com/product/dt-logger-host-software/
The DT2040 Data Logger has 20 ports on the circuit board so a maximum of 40 thermistor connections can be made. Each port can be used to connect the two sensors, one in the 1A/1B terminal connections, and one in the 2A/2B terminal connections.
Below is the terminal block with the removeable strain relief. The S position is only for a shield connection (Common) and should not be used for thermistor connections.
Once the thermistors are connected in order on the circuit board, the sensors can be setup on the Sensor tab in DT Logger Host. The easiest way to set it up is to delete all but first two tabs using the ‘Del Sel’ button. Make sure that the proper sensor type is selected (3K Ohm is the default standard, but that can be designated by the customer before purchase). Change the names of the tabs to reference the prefered nomenclature for the thermistor string. The subsequent thermistors can be added by clicking ‘New Copy’ and then change the tab name. Make sure to click ‘Upload to Logger’ to save the settings to the data logger memory.
When all the sensors have been added, only ten sensors will be displayed at a time. The groups will be designated as A, B, C and D.
Once the sensor tab is set, set the information in the Logging tab and choose ‘Apply Settings’ to start the data logger’. Refer to the DT Logger Host software manual for preferred Logger Options.
To watch real-time readings, click on the Monitor tab. Only 10 sensors can be displayed at a time, to look at different sensors, choose the letter group. The title on the tab for each sensor will be displayed and the units box can be unchecked to show the raw resistance readings.
*Note: Thermistors were not connected to this data logger when this document was written, so there are no values displayed in the screenshot below.
Choosing the Status tab will allow the operator to see the status of the data logger and to download the data.
The Connections tab is used to setup the data logger for the type of connection (DTLink Wireless, RSTAR Wireless or USB).
Click ‘Options’ and Advanced to set and initialize the battery, and check the Use Resistance Scaling factor box for the thermistors.
Below is the wiring schematic that will be delivered with the thermistor strings so the connections can be made to the data logger. The wires will be paired with a piece of heat shrink so the do not get mixed up.
The Resistance vs. Temperature Relationship table for the 3K Ohm Thermistor is attached below. This is the standard thermistor used in most thermistor strings.
If another thermistor type is used in the thermistor string, please contact RST Support at support@rstinstruments.com or phone 1-604-540-1100.
