Cautionary notes – Campbell Scientific CR7 Measurement and Control System User Manual
Page 10

vi
CAUTIONARY NOTES
The typical current drain for the CR7 is
approximately 100 mA while executing and 8-10
mA quiescent. Do not allow the lead-acid
batteries (2.5 Ahr) to drop below 11.76 V as
irreversible battery damage may result.
An external battery connected to the I/O Module
+12V and ground terminals continues to power
the CR7 system even though the CR7 power
switch is off. Reverse polarity protection is NOT
provided on this connection so exercise
extreme care if connecting external power
supplies.
Damage will occur to the analog input channel
circuitry if voltages in excess of +16V are
applied for a sustained period.
A POTENTIALLY DANGEROUS situation can
result due to hydrogen gas build up if the CR7 is
housed in a gas tight enclosure and the internal
lead acid batteries are shorted or overcharged.
Hydrogen concentration levels may occur which
are capable of causing injury or equipment
damage if ignited.
- 014A Met One Wind Speed Sensor (36 pages)
- 020C Wind Direction Sensor (26 pages)
- 024A-L Met One Wind Direction Sensor (30 pages)
- 03001-L R.M. Young Wind Sentry Set (34 pages)
- 03002, 03101, and 03301 R. M. Young Wind Sentry Sensors (40 pages)
- 034A-L WindSet (16 pages)
- 034B-L Met One Windset (34 pages)
- 036, 038 Spark Gapped Junction Box (6 pages)
- 05103, 05103-45, 05106, and 05305 R. M. Young Wind Monitors (30 pages)
- 083E Relative Humidity and Temperature Sensor (22 pages)
- 0871LH1 Freezing Rain Sensor (31 pages)
- 092 Barometric Pressure Sensor (24 pages)
- 10164-L Water Sampler Control Cable for use with Isco and Sigma Autosamplers (18 pages)
- 107-L Temperature Probe (28 pages)
- 108-LC Temperature Probe for MetData1 (12 pages)
- 108-L Temperature Probe (30 pages)
- 109-L Temperature Probe (30 pages)
- 109SS Temperature Probe (32 pages)
- 110PV Surface Temperature Probe (32 pages)
- 21108 RF450 Demo Kit (14 pages)
- 223-L Delmhorst Cylindrical Soil Moisture Block (28 pages)
- 227-L Delmhorst Cylindrical Soil Moisture Block (24 pages)
- 229 Water Matric Potential Sensor and CE4/CE8 (34 pages)
- 237-L Leaf Wetness Sensor (14 pages)
- 247-L Conductivity and Temperature (18 pages)
- 253-L and 257-L (Watermark 200) Soil Matric Potential Sensors (36 pages)
- 25458 DIN-Rail Terminal Kit (10 pages)
- 255-100 Novalynx Analog Output Evaporation Gauge (16 pages)
- 260-953 Alter-Type Wind Screen for Tipping Bucket Rain Gages (14 pages)
- 27106T Gill Propeller Anemometer (18 pages)
- 30066 Battery Terminal Bus (1 page)
- 380, 385, 380M, 385M Met One Rain Gages (22 pages)
- 3WHB10K 3-Wire Half-Bridge Terminal Input Module (14 pages)
- 43347 RTD Temperature Probe and 43502 Aspirated Radiation Shield (40 pages)
- 4386 Battery Terminal Bus (1 page)
- 4WFB120, 4WFB350, 4WFB1K 4-Wire Full Bridge Terminal Input Module (22 pages)
- 4WFBS120, 4WFBS350, 4WFBS1K 4 Wire Full Bridge Terminal Input Modules (46 pages)
- 4WPB100, 4WPB1K PRT Terminal Input Modules (16 pages)
- 52202 Electrically Heated Rain and Snow Gage (16 pages)
- 9522B Iridium Satellite Modem and COM9522B Interface Modem (46 pages)
- A100LK Anemometer (18 pages)
- A150 Desiccated Case (12 pages)
- A21REL-12 Relay Driver (10 pages)
- A6REL-12 Relay Driver (12 pages)
- AL200 ALERT2 Encoder, Modulator, and Sensor Interface (44 pages)