e CR800 and CR850 dataloggers provide precision measurement capabilities in a rugged, battery-operated package. Both models consist of measure-
ment electronics encased in a plastic shell and an integrated wiring panel. e standard operating range is -25° to +50°C. An extended range of -55° to
+85°C for the CR800 or -30° to +80°C for the CR850 is also available.
Removable Power Termi-
nal—simplies connection to
external power supply.
Input/Output Connections—Indi-
vidually congured for ratiometric
resistive bridge, thermocouple,
switch closure, high frequency pulse,
low-level ac, serial sensors, and more.
CS I/O Port—connects
with AC-powered PCs
and communication
peripherals such as
phone, RF, short-haul,
and multidrop modems.
RS-232—provides a 9-pin DCE port for
connecting a battery-powered laptop,
serial sensors or RS-232 modems.
{
Benets and Features
4 MB* of battery-backed SRAM
Program execution rate of up to 100 Hz
CS I/O and RS-232 serial ports
13-bit analog to digital conversions
16-bit microcontroller with 32-bit internal CPU architecture
Temperature compensated real-time clock
Background system calibration for accurate measurements over
time and temperature changes
Single DAC used for excitation and measurements to give ratio-
metric measurements
Gas Discharge Tube (GDT) protected inputs
Data values stored in tables with a time stamp and record number
Battery-backed SRAM and clock that ensure data, programs, and
accurate time are maintained while datalogger is disconnected
from the main power source
One program-status LED
Serial communications with serial sensors and devices supported
via I/O port pairs
PakBus, Modbus, and DNP3 protocols supported
Model Descriptions
The models dier in their keyboard display. The CR800 uses an ex-
ternal keyboard display, the CR1000KD, which connects to the CR800
via its CS I/O port. The CR850 includes an on-board keyboard display
as part of its integrated package.
Operating System/Logic Control
The on-board operating system includes measurement, process-
ing, and output instructions for programming the datalogger. The
programming language, CRBasic, uses a BASIC-like syntax. Measure-
ment instructions specic to bridge congurations, voltage outputs,
thermocouples, and pulse/frequency signals are included. Process-
ing instructions support algebraic, statistical, and transcendental
functions for on-site processing. Output instructions process data
over time and control external devices.
Storage Capacity*
The CR800 series has 2 MB of ash memory for the Operating
System, and 4 MB of battery-backed SRAM for CPU usage, program
storage, and data storage. Data is stored in a table format.
CR800 and CR850 Measurement and Control Systems
*Campbell Scientic is increasing the data storage memory from 2 MB to 4 MB. Dataloggers with a serial number greater than or equal to 3605 will have
a 4 MB memory. e 4 MB dataloggers will also have a sticker on the canister stating “4M Memory”.
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