GENEQ > Environment > Conductivity Meters
| Greenspan Electrical Conductivity Sensors |
| model EC250 & EC350 |
| A 316-grade stainless steel
tube with an o-ring sealed Delrin end fitting provides the EC250 and EC350
with the ruggedness required for the most demanding measurement environments. The sensing head of high impact acrylic contains the PT100 temperature sensor and is built to sustain the rough handling required for reliable field instrumentation. |
| The Stevens-Greenspan Electrical Conductivity Sensors provide highly accurate conductivity measurements in a wide range of hydrological applications. Exceptional reliability and chemical resistance are guaranteed by a state of the art toroidal measuring system. Advanced microprocessor technology provides highly accurate temperature compensated measurements. |
| Make more accurate electrical conductivity measurements with Stevens-Greenspan’s state of the art EC sensor |
| EC250 |
| The Stevens-Greenspan Electrical Conductivity Sensor offers
a unique combination of advanced features: • Toroidal sensing technology eliminates electrode corrosion effects guaranteeing long life and reduced field service. • On-board temperature measurement and microprocessor controlled temperature compensation and linearization ensure highly accurate readings in demanding conditions. • Sensor can be field calibrated with Stevens-Greenspan's easy to use state of the art graphical calibration software. • Separate conductivity and temperature outputs deliver raw conductivity or on-board normalization of conductivity to 25°C. • Optional on-board data logger with sophisticated logging features enables unattended operation for months at a time. |
| Stevens-Greenspan Reliability |
The Stevens-Greenspan EC Sensor combines
robust, sealed construction with an electrode-less sensing system to offer
unparalleled reliability. Designed for low power consumption, the Sensor can be operated from remote power sources for extended periods. Field experience has shown that the Stevens-Greenspan EC Sensor can be left unattended for up to six months. 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. |
| Stevens-Greenspan Accuracy |
Field conductivity measurements in
ionized solutions have traditionally been fraught with inaccuracy due
to temperature and electrode effects. The Stevens-Greenspan EC Sensor
substantially eliminates these conventional sources of error. A large
size toroidal sensor element uses the free ions in solution as a conductive
path between two shielded ferrite transformer cores. This system eliminates
errors caused by electrode degradation. An advanced compensation algorithm
in the on-board microprocessor substantially reduces system non-linearity
and temperature drift errors. |
| Log accurate electrical conductivity measurements cost-effectively with Stevens-Greenspan’s intelligent EC sensor |
| EC350 |
With all the features
of a conventional data acquisition system in one compact package, the
Stevens-Greenspan 300-Series intelligent sensors provide the most cost-effective
solution available today where combined measurement and data collection
functions are required. |
| Logging parameters and schedules are set up using
Stevens- Greenspan’s easy to use graphical software package, Smartcom,
which runs on IBM compatible PCs. Graphical representation of data can be made using Stevens-Greenspan’s Aquagraph software. The software makes graphing your data simple and allows data to be exported in different formats. |
| Stevens-Greenspan’s Intelligent Electrical Conductivity
Sensor model EC350 is a complete, self-contained electrical conductivity
measurement and data logging system. The EC350 adds sophisticated and versatile
data acquisition, control and communications capabilities to Stevens-Greenspan’s
standard EC250 Electrical Conductivity Sensor. Standard features of the EC350 include: • Storage of measured data within the sensor for long periods. • Easy configuration of 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 can trigger additional measuring equipment. • Lithium battery pack option for fully self-contained operation. The added features of the EC350 are accommodated within the same compact sensor body used for the EC250. 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 EC350 make remote site logging of electrical conductivity easier than ever. In combination with an external data modem and mobile phone, the EC350 enables remote uploading of logged data and re-programming of logging schedules. In addition the EC350 can respond to user-programmed alarm conditions by triggering an associated sensor or by calling one of four preset phone numbers with a user-programmed alarm message. The EC350 can be powered using either 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 EC350 can be supplied with a built-in pressure sensor to provide a complete river level and conductivity data logger in one sophisticated and elegant package. |
| Specifications | Model EC250 | Model EC350 |
| Standard EC ranges available | 0–1,000 µS, 0–2,000
µS, 0–5,000 µS, 0–10,000 µS, 0–20,000
µS, 0–60,000 µS Other ranges are available to order. A calibration charge applies to non-standard ranges. |
|
| Linearity | Temperature 0.1% EC 0.2% | Temperature 0.1% EC 0.2% |
| Temperature accuracy | ±0.1°C | ±0.1°C |
| EC accuracy, normalized to 25°C | 1% over range 0–30°C | 0.5% over range 0–35°C |
| EC accuracy, non-normalized | 0.2% | 0.2% |
| Outputs | EC: 4–20mA 0–2.5V 0–1V Temperature: 4–20mA 0–2.5V 0–1V |
RS232 |
| Supply voltage | 8–27V • Reverse polarity protected • Surge protected to 2kV |
same as EC250 |
| Quiescent current | 30mA | 30µA–60mA |
| Warm up time to stable reading | 1 sec | 1 sec |
| Dimensions | length 13.4in (340mm) (including head) 1.8in (45mm) OD Stainless 1.9in (48mm) OD Delrin |
same as EC250 optional battery pack adds extra 10.25in (260mm) to length |
| Weight | 20.8oz (590g) Delrin 25.4oz (720g) Stainless |
20.8oz (590g) Delrin 25.4oz (720g) Stainless |
| Wetted materials | Delrin, 316 stainless steel, acrylic | same as EC250 |
| Cable | 8 core Polyurethane sheath | 12 core Polyurethane sheath |
| Software | ECFA, SMARTCOM, AQUAGRAPH | |
| Standard configuration | Options |
| • Calibrated to standard
range • Cable to requested length and terminated with data connector and tinned copper wires • Field adjust software • 4–20 mA output |
• A complete Delrin body can be provided
for use in corrosive water • Voltage output |