Hach AquaTrend 51200 Instrument Manual page 82

Glossary
Page 82
Glossary
Portable AquaTrend - Mobile device designed to setup and calibrate sensors
already setup on the network. Portable AquaTrends can access all menus
except the network menu and can not perform network operations.
PS1201 - A power supply that provides 25 watts to AquaTrend
network devices.
Remote AquaTrend - Any AquaTrend on a network that is not a Portable or
Master AquaTrend. Remote AquaTrends can display all sensor readings and
access all sensor menus.
repeater - A device capable of amplifying signals when total cable distance is
exceeded in order to extend the network's capabilities.
SCADA - Supervisory Control and Data Acquisition. General term for any
automated (and usually PLC or computer-controlled) system for control and
data acquisition.
sensor - Any one of the Hach devices designed to take measurements for
specific parameters and for use with the AquaTrend Network System
( e.g. the 1720D Turbidimeter)
Serial I/O Module (SIO) - Communication device for two-way communication
with a PC or one-way communication with a printer.
Signal Input Module (SIM) - The Signal Input Module (SIM) provides two
4-20mA analog inputs which can be used to bring measurements from
non-networked sensors into the network.
Signal Output Module (SOM) - Network device that provides two relays,
each with normally open and normally closed contacts rated at a maximum of
5A/250 VAC, and two analog outputs, selectable through the AquaTrend
keypad at either 4-20 or 0-20 mA. Sensor alarms can be configured to trigger
one the relays in the SOM and/or a recorder or controller signal from a sensor
can be attached to the analog outputs of the SOM.
The SOM can either be a stand-alone device (model 51250) or can be internal
to the AquaTrend/SOM (model 51350).
terminator - Impedance stabilizing component that maintains network signal
integrity. One terminator is required for proper network operation, either on an
AquaTrend (without SOM) or on a stand-alone SOM.
topology - Any wiring configuration. See Figure 26 for examples.
51350-18 Glossary.fm