The CR850 is a smaller, research-grade datalogger that includes an on-board keyboard display as part of its integrated package. It is intended for smaller configurations in which fewer sensors will be measured. Each CR850 reads input from sensors, then transmits the data via a communication peripheral; most sensors and telecommunication devices are compatible. Multiple CR850s can be configured as a network or units can be deployed individually. This rugged datalogger can provide stand-alone operation in harsh, remote environments.
The CR850 consists of measurement electronics encased in a plastic shell with an integrated wiring panel, 16-character keyboard, and display screen. The display can show 8 lines x 21 characters (64 x 128 pixels). Custom menus are supported allowing customers to set up choices within the data logger program that can be initiated by a simple “toggle” or “pick list”. Its keyboard and display screen is used to program the data logger, manually initiate data transfer, and display data.
The CR850 uses an external power supply. Low power consumption allows it to operate for extended periods on a battery recharged by a solar panel—eliminating the need for AC power. The CR850 suspends execution when primary power drops below 9.6 V, reducing the possibility of inaccurate measurements.
The on-board operating system includes measurement, processing, and output instructions for programming the datalogger. The programming language, CRBasic, uses a BASIC-like syntax. Measurement instructions specific to bridge configurations, voltage outputs, thermocouples, and pulse/frequency signals are included. Processing instructions support algebraic, statistical, and transcendental functions for on-site processing. Output instructions process data over time and control external devices.
|-NOTE-||Note: Additional specifications are listed in the CR800-Series Specifications Sheet.|
|Operating Temperature Range||
|Maximum Scan Rate||100 Hz|
|Analog Inputs||6 single-ended or 3 differential (individually configured)|
|Voltage Excitation Terminals||2 (VX1, VX2)|
|Switched 12 Volt||1 terminal|
|Input Limits||±5 V|
|Analog Voltage Accuracy||±(0.06% of reading + offset) at 0° to 40°C|
|Power Requirements||9.6 to 16 Vdc|
|Real-Time Clock Accuracy||±3 min. per year (Correction via GPS optional.)|
|Internet Protocols||FTP, HTTP, XML POP3, SMTP, Telnet, NTCIP, NTP|
|Communication Protocols||PakBus, Modbus, DNP3, SDI-12, SDM|
|Idle Current Drain, Average||1 mA (@ 12 Vdc)|
|Active Current Drain, Average||
|Dimensions||24.1 x 10.4 x 5.1 cm (9.5 x 4.1 x 2 in.)|
|Weight||0.7 kg (1.5 lb)|
Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.
|LoggerNet||(Version 3.3 or higher)|
|PC400||(Version 1.4 or higher)|
|PCONNECT (retired)||(Version 3.3 or higher)|
|PCONNECTCE (retired)||(Version 2.2 or higher)|
|VISUALWEATHER||(Version 2 or higher)|
With several channel types, the CR850 is compatible with nearly every available sensor, including thermocouples, SDI-12 sensors, and 4 to 20 mA sensors. A custom ASIC chip expands its pulse count, control port, and serial communications capabilities. The CR850's I/O ports can be paired as transmit and receive, allowing serial communications with serial sensors and devices.
The CR850 is compatible with all of our CDMs (requires an SC-CPI), SDMs, multiplexers, vibrating-wire interfaces, terminal input modules, and relays.
The CR850 communicates with a PC via direct connect, NL201 Ethernet Interface, multidrop modems, short haul modems, phone modems (land line, digital cellular, and voice-synthesized), RF telemetry, and satellite transmitters (Argos and High Data Rate GOES).
Data can be viewed on its onboard keyboard display, CD100 Mountable Display with Keypad, user-supplied iOS or Android device (requires LoggerLink), CD295 DataView II Display, or a user-supplied PDA (PConnect or PConnectCE software required).
The SC115 is the only compatible external data storage device. The CR850 does not have a peripheral port and is therefore not compatible with the CFM100, NL115, or NL120.
The CR850 and its power supply can be housed in any of our standard enclosures.
Any 12 Vdc source can power the CR850 datalogger. Power supplies commonly used with the CR850 are the BPALK, PS100, and PS200. The BPALK provides eight non-rechargeable D-cell alkaline batteries with a 7.5 A h rating at 20°C.
Both the PS100 and PS200 consist of a sealed rechargeable 7 A h battery and a charging regulator. Their battery should be connected to a charging source (either a wall charger or solar panel). These two power supplies differ in their charging regulator. The PS100 has a standard regulator and the PS200 has a micro-controller-based smart regulator. The PS200's regulator provides two-step constant voltage charging and temperature compensation that optimize battery charging and increases the battery’s life.
Also available are the BP12 and BP24 battery packs, which provide nominal ratings of 12 and 24 A h, respectively. These batteries should be connected to a regulated charging source (e.g., a CH100 or CH200 connected to a unregulated solar panel or wall charger).
CRBasic, the CR850's full programming language, supports simple or complex programming and many onboard data reduction processes.
Execution of this download installs the CR800 Operating System and Compiler on your computer. It also updates the CR800 support files for the CRBasic Editor.
Note: This OS has crossed the 2 Meg CR800 size limit for remote download. The OS must be downloaded to the 2 Meg CR800 via direct connect with the Device Configuration Utility. All OS download methods are supported by the 4 Meg CR800.
Upgrading from versions prior to version 28 of the Operating System will reset the datalogger’s CPU drive. This is due to a change in the format of the file system from FAT16 to FAT32. In order for the datalogger to operate correctly, as part of the upgrade, the CPU drive is formatted to FAT32. Any programs stored and running from the CPU drive will be lost. It is not recommended to update the datalogger’s Operating System over a remote connection where program control regulates the communication equipment (turning it on or off, etc.). In these cases, an on-site visit and a backup using DevConfig’s backup utility is necessary to update the datalogger’s Operating System.
In all cases where the datalogger is being updated from an Operating System prior to 28, the use of DevConfig’s backup utility is recommended due to the CPU drive being formatted using the new FAT32 format.
A software utility used to download operating systems and set up Campbell Scientific hardware. Also will update PakBus Graph and the Network Planner if they have been installed previously by another Campbell Scientific software package.
Supported Operating Systems:
Windows 11, 10, 8.1, 8, and 7 (Both 32 and 64 bit)
Number of FAQs related to CR850: 142
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In the CR800-series, CR1000, and CR3000 dataloggers, there is a PreserveVariables instruction that stores the last known value of all Dim or Public variables. The values are restored if the data logger recovers from a power failure, or if the program is stopped with the Retain Data option and then resumed.
The internal file storage on the data logger has limits on the size, quantity, and name length of files. The file name of the new file may need to be shortened, or some older files may need to be deleted using File Control.
Pass-code lockouts (historically known as security codes) are the oldest method of securing a Campbell Scientific data logger. This method provides a level of security, mainly for PakBus communications. However, someone with physical access to a data logger or telecommunications hardware may be able to overcome the five-digit pass-code lockouts. To further secure PakBus communications, use the PakBus Encryption Key and PakBus/TCP password.
50 Hz rejection is available for analog voltage measurements by setting the Integration parameter.
A standard null modem cable can be used to connect a RavenXT-series modem to the data logger RS-232 port. Alternatively, an SC12 cable and an SC105 interface can be used to connect the RavenXT-series modem to the data logger CS I/O port.
Use the ModBusServer() instruction in the program editor, and follow the instructions embedded in the Help file.