METER ES-2 Manuale utente

ES-2

TABLE OF CONTENTS

1. Introduction.............................................................................................. 1

2. Operation ...................................................................................................2

2.1 Installation ................................................................................................2

2.2 Connecting................................................................................................. 3

2.2.1 Connect to METER Data Logger........................................................4

2.2.2 Connect to a Non-METER Data Logger .............................................4

2.3 Communication .........................................................................................6

3. System......................................................................................................... 7

3.1 Specifications............................................................................................7

3.2 Components ..............................................................................................9

3.3 Theory...................................................................................................... 10

3.3.1 Temperature .................................................................................. 10

3.3.2 Electrical Conductivity .................................................................. 10

4. Service....................................................................................................... 11

4.1 Calibration ............................................................................................... 11

4.2 Maintenance............................................................................................ 11

4.3 Troubleshooting....................................................................................... 12

4.4 Customer Support.................................................................................... 12

4.5 Terms and Conditions .............................................................................. 13

Index ................................................................................................................. 14

13890-02

4.30.2020

1. INTRODUCTION

Thank you for choosing the ES-2 Electrical Conductivity and Temperature Sensor from

METER Group.

The ES-2 sensor measures in an irrigation pipe, a water body, or in a tank. A thermistor in

thermal contact with the probe provides water temperature, while the screws on the surface

of the sensor from a four-electrode array to measure electrical conductivity (EC). EC is useful

for measuring salinity levels or quality of irrigation water.

Prior to use, verify the ES-2 arrived in good condition.

OPERATION

2. OPERATION

Please read all instructions before operating the ES-2 to ensure it performs to its full

potential.

PRECAUTIONS

METER sensors are built to the highest standards, but misuse, improper protection, or

improper installation may damage the sensor and possibly void the manufacturer’s warranty.

Before integrating ES-2 into a system, follow the recommended installation instructions and

have the proper protections in place to safeguard sensors from damage.

2.1 INSTALLATION

Follow the steps listed in Table 1 to set up the ES-2 and start collecting data.

Table 1 Installation

Preparation

Determine Installation Type

Decide if the ES-2 will take measurements in a pipe or water body.

Conduct System Check

Plug the sensor into the logger (Section2.2) to make sure the sensor is

functional.

Verify all sensors read within expected ranges. To validate both sensor and

logger functionality, take a sensor measurement in air and water.

Pipe Installation

Connect ES-2 to Pipe

Ensure the protective screw-on cap is attached.

Install the white threaded plug on the side of the protective screw cap.

Screw the the ES-2 into a 3/4-in National Pipe Thread (NPT) Tee pipe ﬁtting.

NOTE: If necessary, use a pipe converter to convert from the 3/4-in NPT thread size to a

size more appropriate for the system.

Orient the sensor with the cable end facing down or to the side. This will allow

air to escape from the sensing area.

Twist sensor into pip ﬁtting

ES-2

Table 1 Installation (continued)

Water Body

Installation

Suspend ES-2 in Water Body

Ensure the protective screw-on cap is attached.

Remove the white threaded plug from the side of the protective screw cap.

Suspend the sensor in the tank or water body. If this is not possible, make sure

that the sensor is placed away from the sides of the tank or water body as

much as possible.

Sensor body suspended in water body

Connecting

Secure and Protect Cables

NOTE: Improperly protected cables can lead to severed cables or disconnected sensors.

Cabling issues can be caused by many factors such as rodent damage, driving over sensor

cables, tripping over cables, not leaving enough cable slack during installation, or poor

sensor wiring connections.

Install cables in conduit or plastic cladding when near the ground to avoid

rodent damage.

Gather and secure cables between the ES-2 and the data logger to the

mounting mast in one or more places.

Connect to Data Logger

Plug the sensor into a data logger.

Use the data logger to make sure the sensor is reading properly.

Verify that these readings are within expected ranges.

For more instructions on connecting to data loggers, refer to Section2.2.

2.2 CONNECTING

The ES-2 works seamlessly with METER data loggers. The ES-2 can also be used with other

data loggers, such as those from Campbell Scientific, Inc. For extensive directions on how to

integrate the sensors into third-party loggers, refer to the ES-2 Integrator Guide.

OPERATION

ES-2 sensors require an excitation voltage in the range of 3.6 to 15.0 VDC and operate

at a 3.6-VDC level for data communication. ES-2 can be integrated using DDI serial

or SDI-12 protocol. See the ES-2 Integrator Guide for details on interfacing with data

acquisition systems.

ES-2 sensors come with a 3.5-mm stereo plug connector (Figure1) to facilitate easy

connection with METER loggers. ES-2 sensors may be ordered with stripped and tinned

wires to facilitate connecting to some third-party loggers (Section2.2.2).

Ground

Digital communication

Power

Figure1 Stereo plug connector

The ES-2 comes standard with a 5-m cable. It may be purchased with custom cable lengths for

an additional fee (on a per-meter basis). In some instances, the cable can be extended beyond

75 m by the user, but this is discouraged for a variety of reasons. Please contact Customer

Support for more details before extending or splicing cables.

2.2.1 CONNECT TO METER DATA LOGGER

The ES-2 works most efficiently with METER ZENTRA series data loggers. Check the METER

download webpage for the most recent data logger firmware. Logger configuration may

be done using either ZENTRA Utility (desktop and mobile application) or ZENTRA Cloud

(web-based application for cell-enabled data loggers).

1. Plug the stereo plug connector into one of the sensor ports on the logger.

2. Use the appropriate software application to conﬁgure the chosen logger port for the

ES-2. METER data loggers will automatically recognize ES-2 sensors.

3. Set the measurement interval.

METER data loggers measure the ES-2 every minute and return the average of the 1-min

data across the chosen measurement interval.

ES-2 data can be downloaded from METER data loggers using either ZENTRA Utility or

ZENTRA Cloud. Refer to the logger user manual for more information about these programs.

2.2.2 CONNECT TO A NONMETER DATA LOGGER

The ES-2 can be purchased for use with non-METER (third party) data loggers. Refer to the

third-party logger manual for details on logger communications, power supply, and ground

ports. The ES-2 Integrator Guide also provides detailed instructions on connecting sensors to

non-METER loggers.

ES-2

ES-2 sensors can be ordered with stripped and tinned (pigtail) wires for use with screw

terminals. Refer to the third-party logger manual for details on wiring.

Connect the ES-2 wires to the data logger as illustrated in Figure2 and Figure3, with the

power supply wire (brown) connected to the excitation, the digital out wire (orange) to a

digital input, and the bare ground wire to ground.

Ground (bare)

Digital

communication (orange)

Power (brown)

Figure2 Pigtail wiring

NOTE: Some early ES-2 units may have the older Decagon wiring scheme where the power supply is white, the digital

out is red, and the bare wire is ground.

Excitation Digital

Data Logger

Ground

Digital

communication

(orange)

Ground

(bare)

Power

(brown)

Figure3 Wiring diagram

NOTE: The acceptable range of excitation voltages is from 3.6 to 15.0 VDC. To read the ES-2 with Campbell Scientific

data loggers,power the sensors off a switched 12-V port.

If the ES-2 cable has a standard stereo plug connector and needs to be connected to a

non-METER data logger, use one of the following two options.

Option 1

1. Clip off the stereo plug connector on the sensor cable.

2. Strip and tin the wires.

3. Wire it directly into the data logger.

This option has the advantage of creating a direct connection and minimizes the chance of

the sensor becoming unplugged. However, it then cannot be easily used in the future with a

METER readout unit or data logger.

OPERATION

Option 2

Obtain an adapter cable from METER.

The adapter cable has a connector for the stereo plug connector on one end and three wires

(or pigtail adapter) for connection to a data logger on the other end. The stripped and tinned

adapter cable wires have the same termination as in Figure3: the brown wire is excitation,

the orange is output, and the bare wire is ground.

NOTE: Secure the stereo plug connector to the pigtail adapter connections using adhesive-lined heat shrink to ensure

the sensor does not become disconnected during use.

2.3 COMMUNICATION

The ES-2 communicates using two different methods:

• DDI serial string

• SDI-12 communication protocol

To obtain detailed instructions, refer to the ES-2 Integrator Guide.

The SDI-12 protocol requires that all sensors have a unique address. ES-2 sensor factory

default is an SDI-12 address of 0. To add more than one SDI-12 sensor to a bus, the sensor

address must be changed as described in these steps.

1. Using a PROCHECK connected to the sensor, press the MENU button to bring up the

Configuration tab.

NOTE: If the PROCHECK does not have this option, please upgrade its firmware to the latest version from the

METER Legacy Handheld Devices webpage.

2. Scroll down to SDI-12 Address. Press ENTER.

3. Press the UP or DOWN arrows until the desired address is highlighted.

Address options include 0...9, A...Z, and a...z.

4. Press ENTER.

Detailed information can also be found in the application note Setting SDI-12 addresses on

METER digital sensors using Campbell Scientific data loggers and LoggerNet.

When using the sensor as part of an SDI-12 bus, excite the sensors continuously to avoid

issues with initial sensor startup interfering with the SDI-12 communications.

ES-2

3. SYSTEM

This section describes the specifications, components, and theory of the ES-2.

3.1 SPECIFICATIONS

MEASUREMENT SPECIFICATIONS

Temperature

Range 40 to 60 °C

Resolution 0.1 °C

Accuracy ±1 °C

Bulk EC

Range 0 to 120 dS/m

Resolution 0.001 dS/m

Accuracy ±0.01 dS/m or ±10% (whichever is greater)

COMMUNICATION SPECIFICATIONS

Output

DDI serial or SDI-12 communication protocol

Data Logger Compatibility

METER ZL6 data loggers and any data acquisition system capable of 3.6- to 15-VDC

power and serial or SDI-12 communication

PHYSICAL SPECIFICATIONS

Dimensions

Length 10.9 cm (4.30 in)

Width 2.4 cm (0.95 in)

Thread 1/2-in National Pipe Thread

Operating Temperature Range

Minimum –40 °C

Maximum 60 °C

NOTE: Sensors may be used at higher temperatures under certain conditions; contactCustomer

Supportfor assistance.

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