The UTA is a special purpose amplifier that converts the microamp-level current output of LI-COR light sensors to a corresponding signal voltage. The UTA provides a simple interface between LI-COR sensors and voltage input data loggers, chart recorders, HVAC, and greenhouse control systems.
The UTA can be configured at EME Systems, or by the end user, for any one of a large number of gain settings through manipulation of two switch blocks. The calibration tag provided by LI-COR with each sensor, in conjunction with the preset amplifier gain factor, can be used to compute the light levels incident on the sensor with a high degree of accuracy. Alternate gain settings are available on special order. One of the most popular alternate settings is a 2.5V output for use with Onset HOBO data loggers.
The Rev. B version of the UTA includes a bias generator that allows the output to swing closer to ground.
On the UTA shown in the photo, the input cable from the sensor will enter through the gland nut to the left and the output cable to the equipment will exit through the gland nut on the right. The UTA is also available with a BNC connector on the input*. The calibration label on the outside of the enclosure is marked with the applicable gain setting. Wiring instructions and calibration notes are included with each UTA.