Campbell TB4, Instruction Manual

Page: 13 / 28

TB4 and TB4MM Tipping Bucket Rain Gages
5
Resolution: 0.254 mm (0.01 in) TB4
0.008 in (0.2 mm) TB4MM
Environmental Conditions
Temperature: 0 to 70 °C
Humidity: 0 to 100%
Operating Temperature: –20 to 70 °C
Siphon Capacity: 0.3 mm (0.012 in)
Contact: Dual reed switch
Capacity: 12 VA (0.5 A maximum)
Base Material: Thermoplastic
Size
Weight: 2 kg (4.41 lb)
Height: 330 mm (13 in)
Diameter: 200 mm (7.9 in)
7. Installation
If you are programming your datalogger with Short Cut , skip Section 7.1 ,
Wiring
(p. 5)
, and Section 7.2 , Datalogger Programming
(p. 6)
. Short Cut does
this work for you. See Section 4 , QuickStart
(p. 2)
, for a Short Cut tutorial.
The 260-953 Alter-Type Wind Screen’s siting information and
installation procedure are provided in our
260-953 manual .
7.1 Wiring
Connections to Campbell Scientific dataloggers are given in TABLE 7-1 .
TABLE 7-1. Wire Color, Wire Function, Datalogger Connection
Wire
Color
Wire
Function
Datalogger Connection
Terminal for Pulse
Channel Input
Datalogger Connection
Terminal for Control
Port Input
1
Black Rain signal
P , P_SW , or U
1
(pulse channel)
C
(control port)
White
Rain signal
reference
AG or
⏚
(analog ground)
5 V
(on datalogger)
Clear Shield
AG or
⏚
(analog ground)
AG or
⏚
(analog ground)
1
U channels are automatically configured by the measurement instruction.
A long cable has an appreciable capacitance between the lines. A built-up
charge could cause arcing when the switch closes, shortening switch life. A
NOTE