The Stevens-Greenspan Conductivity/ Temperature/Pressure Sensor provides the accuracy and reliability required for a wide range of demanding measuring applications. With state of the art ceramic pressure and toroidal conductivity measurement technologies the Stevens-Greenspan CTD350 Sensor guarantees long term performance and highly accurate temperature compensated measurements in the harshest of environments.

Make more accurate electrical conductivity, temperature and pressure measurements with Stevens-Greenspan’s state of the art CTD350 sensor

CTD350

• The Stevens-Greenspan Conductivity/Temperature/Pressure Sensor provides numerous state of the art technical features:
• Toroidal conductivity sensing technology eliminates electrode corrosion effects, guaranteeing long life and reduced field service.
• On-board microprocessor controlled temperature compensation and linearization delivers accurate conductivity data normalized to 25°C. Alternatively, raw conductivity data is also provided.
• Ceramic pressure sensing diaphragm offers unmatched reliability.
• Depth readings regardless of atmospheric pressure changes (through the use of a large diameter venting tube cable).
• Software calibration allows users to quickly and accurately recalibrate the sensor, eliminating the down time required when sensors have to be returned for laboratory calibration. Easy to use Stevens-Greenspan calibration software runs on a portable PC.

The Stevens-Greenspan CTD350 Sensor combines robust, sealed construction with an electrode-less conductivity sensing system to offer unparalleled reliability. Designed for low power consumption, the sensor can be operated from remote power sources for extended periods. The high reliability of Stevens-Greenspan sensors means critical measurements are not lost through sensor down time. Time wasting unscheduled site visits are therefore minimized.

The Stevens-Greenspan CTD350 Sensor substantially eliminates inaccuracy in conductivity measurements due to temperature and electrode effects. A large toroidal sensing element uses free ions in solution as a conductive path between two shielded ferrite transformer cores, eliminating errors caused by electrode degradation. On-board microprocessor compensation substantially reduces system non-linearity and temperature drift errors.

Accuracy in pressure measurement is designed into the Stevens- Greenspan CTD350 Sensor through the use of a large-faced gold plated ceramic pressure sensor — a technology known for its long term repeatability — supplemented by microprocessor controlled electronics which maintain near perfect linearity (0.02%) and low temperature drift (0.002% /°C) over a wide depth range.

Stevens-Greenspan’s intelligent Conductivity/Temperature/ Pressure Sensor model CTD350 is a complete, self-contained conductivity, pressure and temperature measurement and data logging system. The CTD350 provides sophisticated and versatile data acquisition, control and communications capabilities. Standard features of the CTD350 include:

• Storage of measured data withithe sensor for long periods.
• Easy configuratioof logging parameters and uploading of logged data.
• Automatic transfer of data to a central office simply by attaching a data modem and mobile phone.
• Improved linearity and accuracy through the use of microprocessor based compensation.
• Facility to set alarm conditions which catrigger additional monitoring equipment such as water samplers.
• Lithium battery pack optiofor fully self-contained operation.

A separate data logger and weatherproof housing are not required, eliminating the added deployment costs normally associated with providing a remote data logging capability.

Sophisticated communication features in the CTD350 make remote site logging of key water parameters easier than ever. In combination with an external data modem and mobile phone, the CTD350 enables remote uploading of logged data and re-programming of logging schedules. In addition the CTD350 can respond to user-programmed alarm conditions by triggering an associated sensor or by calling one of four preset phone numbers with a userprogrammed alarm message.

The CTD350 can be powered using external batteries (via the sensor cable) or with Stevens-Greenspan’s optional lithium battery pack, which can be fitted as an extension to the sensor body, making a fully self-contained measurement and logging system.

The CTD350 also provides a supplementary rain gage input. With the addition of a tipping bucket rain gage, the CTD350 becomes a completely self-contained hydrographic measuring station, enabling correlation of rainfall and river height data from one compact monitoring package.