Apogee AC-421 User manual

APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA
TEL: [phone] | FAX: [phone] | 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