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Campbell Scientific CR300

The CR300 is a multi-purpose, compact measurement and control data logger. This small, low-cost, high-value data logger offers fast communications, low power requirements, built-in USB, and excellent analog input accuracy and resolution. The CR300 can measure most hydrological, meteorological, environmental, and industrial sensors. It concentrates data, makes it available over varied networks, and delivers it using your preferred protocol. It also performs automated on-site or remote decision making for control and M2M communications. The CR300 is ideal for small applications requiring long-term remote monitoring and


The CR300 is a low-powered data logger designed to measure sensors, analyze data, and store data and programs. A batterybacked clock assures accurate timekeeping. The on-board, BASIC-like programming language—common to all Campbell Scientific data loggers—supports data processing and analysis The CR300 wiring panel includes a switchable 12 V terminal, and analog grounds dispersed among six analog terminals.

Benefits and Features

  • Connects directly to a computer’s USB port
  • Differentiates even slight changes in data values with higher
    resolutions measurements (24 bit Adc)
  • Provides simple serial sensor integration and measurement
    with SDI-12 and/or RS-232
  • Supports full PakBus networking
  • Includes embedded web page for direct connection via web browser

CR300-Series Specifications Sheet.

Operating Temperature Range

Non-condensing environment
-40° to +70°C (standard)

Maximum Scan Rate

10 Hz

Case Material

Powder-coated aluminum

Analog Inputs

6 single-ended or 3 differential
(individually configured)

Pulse Counter

8 (P_SW, P_LL, C1, C2, and SE1 to

Communications Ports

USB Micro B

Switched 12 Volt

1 terminal

Digital I/O

7 terminals (C1, C2, P_SW, and SE1 to SE4) configurable for digital input and output. Includes status high/low, pulse width modulation, external interrupt, and communication functions. Exception: The SE4 terminal doesn't do external interrupt.

Input Limits

-100 to +2500 mV

Analog Voltage Accuracy

* Accuracy specifications do not include sensor or measurement noise.
* ±(0.1% of measurement + offset) at -40° to +70°C
* ±(0.04% of measurement + offset) at 0° to 40°C



Power Requirements

16 to 32 Vdc for charger input (CHG) (Current limited to 0.9 A maximum for power converter or solar panel input.)

Real-Time Clock Accuracy

±1 min. per month

Internet Protocols

Ethernet, PPP, RNDIS, ICMP/Ping, Auto-IP(APIPA), IPv4, IPv6, UDP, TCP, TLS (v1.2), DNS, DHCP, SLAAC, NTP, Telnet, HTTP(S), FTP(S), SMTP/ TLS, POP3/TLS

Communication Protocols

PakBus, Modbus, DNP3, SDI-12, TCP, UDP, and others

CPU Drive/Programs

80 MB serial flash

Data Storage

30 MB serial flash

Idle Current Drain, Average

1.5 mA (@ 12 Vdc)

Active Current Drain, Average

* 23 mA (@ 12 Vdc with processor always on)
* 5 mA (@ 12 Vdc for 1 Hz scan with 1 analog measurement)


* 13.97 x 7.62 x 4.56 cm (5.5 x 3.0 x 1.8 in.)
* Additional clearance required for cables and leads.


242 to 250 g (0.53 to 0.55 lb) depending on communication option selected