CTD-Fluor, Temperature and Depth with Fluorometer. The XR-420 CTD is an autonomous data logger designed to monitor conductivity, temperature and pressure with the addition of a sea point fluorometer for either rhodimine or chlorophyll. The two central electrodes are high impedance and designed to monitor the AC voltage between them, which is generated by current injected into two further electrodes. The fifth electrode is used to confine the field within the sensor. The conductivity current is electrically isolated and data coupled by optical isolation to reduce interference from external conditions and minimize electrode corrosion.
Temperature is measured by an array of single thermistors, up to six eight-channel modules.
The XR-420 CU is the data logger of your choice. All six modules can be customer-configured to satisfy virtually any deployment scenario. Let us know what you require. The Control Unit which houses the circuitry has a BNC connector for connection to the Probe and a Bendix Pigmy 6 pin connector for receipt of input power and signal output. Two internal calibration controls and three internal switches are provided within the electronic Control Unit.