Campbell CR850, Operator'S Manual

Page: 64 / 566

Section 5. System Overview
64
panel temperature at each scan, and the one-minute sample of panel temperature.
TCTemps displays two thermocouple temperatures.
,
Custom Keyboard and
Display Menus
(p. 486),
and Keyboard Display
(p. 69).
5.1.4 CR1000KD Keyboard Display
The CR1000KD, illustrated in figure CR1000KD Keyboard Display
,
is a
peripheral optional to the CR800. See the appendix Keyboard Displays
(p. 545)
for
more information on available keyboard displays.
The keyboard is an essential installation and maintenance tool for many
applications. It allows interrogation and programming of the CR800 datalogger
independent of other telecommunications links. More information on the use of
the keyboard display is available in the sections
Read More! To implement
custom menus, see CRBasic Editor Help for the DisplayMenu() instruction.
CRBasic programming in the CR800 facilitates creation of custom menus for the
external keyboard / display.
Figure Custom Menu Example
(p. 70)
shows windows from a simple custom menu
named DataView . DataView appears as the main menu on the keyboard display.
DataView has menu item Counter , and submenus PanelTemps , TCTemps and
System Menu . Counter allows selection of one of four values. Each submenu
displays two values from CR800 memory. PanelTemps shows the CR800 wiring-
panel temperature at each scan, and the one-minute sample of panel temperature.
TCTemps displays two thermocouple temperatures.
,
Custom Keyboard and
Display Menus
(p. 486),
and Keyboard Display
(p. 69).
The CR1000KD can be
mounted to a surface by way of the two #4-40 x .187 screw holes at the back.
5.1.5 Power Requirements
Read More! See Power Sources
(p. 82).
The CR800 operates from a power supply with voltage ranging from 9.6 to 16
Vdc, and is internally protected against accidental polarity reversal. The CR800
has modest-input power requirements. In low-power applications, it can operate
for several months on non-rechargeable batteries. Power systems for longer-term
remote applications typically consist of a charging source, a charge controller, and
a rechargeable battery. When ac line power is available, an ac/ac or ac/dc wall
adapter, a charge controller, and a rechargeable battery can be used to construct a
UPS (uninterruptible power supply). Contact a Campbell Scientific applications
engineer for assistance in acquiring the items necessary to construct a UPS.
Applications with higher current requirements, such as satellite or cellular phone
communications, should be evaluated by means of a power budget with a
knowledge of the factors required by a robust power system. Contact a Campbell
Scientific applications engineer if assistance is required in evaluating power
supply requirements.
Common power devices are:
•
Batteries
o
Alkaline D-cell — 1.5 Vdc / cell
o
Rechargeable lead-acid battery