Apogee AC-421 Bedienungsanleitung

APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA

TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM

OWNER’S MANUAL

SDI-12 CONVERTER

Model AC-421

TABLE OF CONTENTS

Owner’s Manual ............................................................................................................................................................................... 1

Declaration of Conformity ....................................................................................................................................................... 3

Introduction ............................................................................................................................................................................. 4

Sensor Models ......................................................................................................................................................................... 4

Specifications ........................................................................................................................................................................... 4

Deployment and Installation.................................................................................................................................................... 5

Operation and Measurement .................................................................................................................................................. 6

Spreadsheet Table of Majority of SDI-12 Commands .............................................................................................................. 7

Maintenance and Recalibration............................................................................................................................................... 8

Troubleshooting and Customer Support.................................................................................................................................. 9

Return and Warranty Policy................................................................................................................................................... 15

DECLARATION OF CONFORMITY

EU Declaration of Conformity

This declaration of conformity is issued under the sole responsibility of the manufacturer:

Apogee Instruments, Inc.

721 W 1800 N

Logan, Utah 84321

USA

for the following product(s):

Models: AC-421

Type: SDI-12 Converter

The object of the declaration described above is in conformity with the relevant Union harmonization legislation:

2014/30/EU Electromagnetic Compatibility (EMC) Directive

2011/65/EU Restriction of Hazardous Substances (RoHS 2) Directive

2015/863/EU Amending Annex II to Directive 2011/65/EU (RoHS 3)

Standards referenced during compliance assessment:

EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use –EMC requirements

EN 50581:2012 Technical documentation for the assessment of electrical and electronic products with respect to

the restriction of hazardous substances

Please be advised that based on the information available to us from our raw material suppliers, the products

manufactured by us do not contain, as intentional additives, any of the restricted materials including lead (see

note below), mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), polybrominated

diphenyls (PBDE), bis(2-ethylhexyl) phthalate (DEHP), butyl benzyl phthalate (BBP), dibutyl phthalate (DBP), and

diisobutyl phthalate (DIBP). However, please note that articles containing greater than 0.1% lead concentration are

RoHS 3 compliant using exemption 6c.

Further note that Apogee Instruments does not specifically run any analysis on our raw materials or end products

for the presence of these substances, but rely on the information provided to us by our material suppliers.

Signed for and on behalf of:

Apogee Instruments, October 2019

Bruce Bugbee

President

Apogee Instruments, Inc.

INTRODUCTION

This device is used for testing and addressing SDI-12 sensors. It also allows customer utilize the serial USB port to

connect a SDI-12 sensor and communicate with it through its own software. This tool can be used to familiarize

oneself with SDI-12 commands as well as troubleshooting individual sensor performance.

SENSOR MODELS

SPECIFICATIONS

Model

Output

SDI-12 converter

USB

AC-421

Input Voltage Requirement

5 V USB

Current Draw

13 mA

Response Time

0.6 s, time for detector signal to reach 95 % following a step change;

fastest data transmission rate for SDI-12 circuitry is 1 s

Operating Environment

-45 to 80 C; 0 to 100 % relative humidity (non-condensing)

Dimensions

60.40 mm x 17.40 mm x 12.45 mm

Mass

11 g

Sensor model number and serial number are

located on the top of the USB device. If you need

the manufacturing date of your sensor, please

contact Apogee Instruments with the serial

number of your sensor.

DEPLOYMENT AND INSTALLATION

Plug into USB port and open up DSI software.

Apogee DSI software can be downloaded from: https://www.apogeeinstruments.com/downloads/

Apogee Digital Sensor Opening Screen

OPERATION AND MEASUREMENT

Wire up to green block and plug in making sure to connect the ground wire first. Then, connect the signal line

second and the power line last. Below is common wiring up of Apogee Instruments SDI-12 sensors. Please check

your individual sensor manual for wiring instructions.

VERY IMPORTANT: Apogee changed all wiring colors of our bare-lead sensors in March 2018 in conjunction

with the release of inline cable connectors on some sensors. To ensure proper connection to your data device,

please note your serial number or if your sensor has a stainless-steel connector 30 cm from the sensor head then

use the appropriate wiring configuration.

Common Apogee Sensor Wiring Configurations

Below are the two possible sensor wiring configurations of Apogee sensors. Please see your respective sensor’s

product manual to find the correct wiring configuration for your sensor.

Black: Ground (for sensor signal and input

power) (connect first)

Red: Power In (4.5-24 V DC) (connect last)

White: SDI-12 Data Line

Clear: Shield/Ground

Red: Power In (4.5-24 V DC) (connect last)

Black: SDI-12 Data Line

Clear: Ground (shield wire) (connect first)

SPREADSHEET TABLE OF MAJORITY OF SDI-12 COMMANDS

AC-421 SDI-12 Command Quick Reference

SDI-12 Command

(a = sensor

address)

What sensor does

SDI-12 Return*

Queries sensor addresses

Returns current address for sensors on the data

line

Ex: ?! 0

Confirm communication

Returns current sensor address

EX: 0I! 0

Returns sensor information (e.g.,

sensor model, serial number,

firmware version, etc.)

Varies, please consult your sensor’s manual**

EX: 0I! 013Apogee SI-4210.62210

Displays internal saved data

(e.g., calibration coefficients,

offsets, etc.)

Varies, please consult your sensor’s manual**

EX: 0V! 00007

0D0! 0+1.72402r+09+1.01104e+07+82608.4

0D1! 0-2.92505e+06+23518-29598+6.2210

aAx

Change sensor address to a new

value (x = 1-9 or A-Z)

Sensor will return the value of the new address

EX: 0A1! 1

aM, aM1, aM2 …

Used to take a measurement

Varies, please consult your sensor’s manual**

EX: 0M! 00011

0M! 0

0D0! 0+28.04520

aMC, aMC1,

aMC2 …

Used to take a measurement.

Data is returned with a check

character

Varies, please consult your sensor’s manual**

EX: 0MC! 00011

0M! 0

0D0! 0+28.23737BXE

aC, aC1, aC2

Used to take a measurement

when more than one sensor is

used on the same data line

Varies, please consult your sensor’s manual**

EX: 0C! 000101

0D0! 0+28.00574

aCC, aCC1, aCC2

Used to take a measurement

when more than one sensor is

used on the same data line. Data

is returned with a check

character

Varies, please consult your sensor’s manual**

EX: 0CC! 000101

0D0! 0+28.19998Iee

aD0, aD1,

aD2 … ***

Used to return recorded

measurements from the M!, C!,

or CC! commands

Varies, please consult your sensor’s manual**

See above examples

*Example command outputs taken using an Apogee SI-421-SS IR sensor

**Sensor manuals can be found online at: https://www.apogeeinstruments.com/product-manuals/

***AC-421 automatically does display command with any measurement command

MAINTENANCE AND RECALIBRATION

Keep dry and free of dust and it should last forever. There is no need to send back for calibration as it only

converts digital signals and doesn’t actually measure anything.

TROUBLESHOOTING AND CUSTOMER SUPPORT

Independent Verification of Functionality

The simplest way to check sensor functionality is the a! command. This will return the address of the unit. Most

sensors have a default address of “0.”

Error when DSI Software is Open Without an AC-421 Plugged In

Correctly Opening SDI-12 Emulator with AC-421 Plugged Into USB Port

SDI-12 Sensor Incorrectly Wired up to AC-421

If the AC-421 becomes unplugged with emulator window still open and you attempt to send an SDI-12

command.

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