Cable Wiring; Installing Aqua4Plus Or Aqua4Plus Lite Software; Using Without Aqua4Plus Or Aqua4Plus Lite Software; Grounding Issues - Seametrics TempHion Instructions Manual

INSTALLATION

Cable Wiring

If you buy your cabled sensor with a connector installed
(the normal configuration), no further wiring is needed.
For reference purposes, the first two diagrams below show
the pinout from the connector for various scenarios. The
final diagram shows the pinout if you bought your sensor
without a connector for use with SDI-12.
White
Purple
Yellow
Brown
Blue
Shield
For Modbus
®
White
Purple
Yellow
Brown
Blue
Shield
For SDI-12—with 5-pin connector
White
Purple
Yellow
Brown
Blue
Shield
For SDI-12—without connector
Seametrics • 253.872.0284
1 12 VDC+ (Vaux)
2 Modbus D-
3 Modbus D+
4 SDI-12 (Not used)
5 12 VDC- (GND)
5-Pin
Connector
—with 5-pin connector
1 12 VDC+ (Vaux)
2 Modbus D- (Not used)
3 Modbus D+ (Not used)
4 SDI-12 Signal
5 12 VDC- (GND)
5-Pin
Connector
12 VDC+ (Vaux)
Modbus D- (Not used)
Modbus D+ (Not used)
SDI-12 Signal
12 VDC- (GND)
Earth ground
Installing Aqua4Plus Software
The TempHion comes with the Aqua4Plus host software
that is installed on your PC or laptop. Use this software to
program the datalogger, to retrieve data from the logger,
to view collected data, and to export data to external files
for use with spreadsheets or databases.
Refer to the software manuals for details on installing and
using Aqua4Plus.
Using TempHion Without Aqua4Plus
Most users will use the TempHion with Seametrics'
Aqua4Plus software. However, the TempHion is quite
versatile, communicating via either Modbus
interfaces, allowing you to do the following:
• Read a TempHion via Modbus
software.
• Read a TempHion via SDI-12 protocol.
• Display readings from a TempHion on a panel
meter.
If you want to use one of these methods, see the chapter
Direct Read Modbus

Grounding Issues

It is commonly known that when using electronic
equipment, both personnel and equipment need to be
protected from high power spikes that may be caused by
lightning, power line surges, or faulty equipment. Without
a proper grounding system, a power spike will find the path
of least resistance to earth ground—whether that path is
through sensitive electronic equipment or the person
operating the equipment. In order to ensure safety and
prevent equipment damage, a grounding system must be
used to provide a low resistance path to ground.
When using several pieces of interconnected equipment,
each of which may have its own ground, problems with
noise, signal interference, and erroneous readings may be
noted. This is caused by a condition known as a Ground
Loop. Because of natural resistance in the earth between
the grounding points, current can flow between the points,
creating an unexpected voltage difference and resulting
erroneous readings.
The single most important step in minimizing a ground loop
is to tie all equipment (sensors, dataloggers, external power
sources, and any other associated equipment) to a single
common grounding point.
connecting the shield to ground at the connector end.
Page 9
TEMPHION INSTRUCTIONS
using your own
®
/SDI-12.
®
Seametrics recommends
or SDI-12
®
seametrics.com