Campbell Scientific CS700 Tipping Bucket Rain Gage and CS700H Heated Rain Gage - Manual (Page 5)

CS700 and CS700H Rain Gage
1. General Description
The CS700 tipping bucket rain gage is manufactured by Hydrological Services
Pty. Ltd. (Model TB-3), and modified for use with Campbell Scientific
dataloggers (see Figure 1-1). It catches rainfall in the 7.87 in. (200 mm)
collection funnel. When 0.01 in. of rainfall is collected, the tipping bucket
assembly tips and activates a reed switch. The switch closure is recorded by the
datalogger. After the bucket tips, the water drains out the screened base of the
gage.
The CS700H is a heated version of the CS700 that can measure the water
content of snow (see Figure 1-1). It includes an internal snow sensor that is
activated when the air temperature drops below 4°C. If the snow sensor
detects snow in the catch area (funnel), the heating elements automatically turn
on and keep the funnel temperature at +10°C. The heater goes into a wait
mode when snow has not been detected for 18 minutes then automatically
deactivates when the air temperature drops below -20°C.
The CS700H has two power configuration options (either AC or DC). With
the AC option, a Phoenix Contact Power Supply is shipped with the CS700H.
With the DC option, the CS700H is connected to a user-supplied battery. This
option is ideal for remote sites using wind or solar power to recharge the
battery. Battery capacity requirements vary according to the application and
site location.
Appendix A provides detailed information about the CS700H’s
operation. NOTE
Both the CS700 and CS700H feature a heavy-duty, cast aluminum housing and
base; a dual-reed switch potted in soft silicon rubber with varistor protection;
and a siphon that allows the precipitation to flow at a steady rate regardless of
rainflow intensity. The siphon reduces typical rain bucket errors and produces
accurate measurements over a range of 0 to 27.6 in./hr.
The 260-953 Alter-Type Wind Screen can be used with the
CS700 and CS700H to minimize the effects of strong winds. NOTE
The “-L” after the model CS700 (CS700-L) or CS700H (CS700H-L) indicates
that the cable length is user specified when ordering. This manual refers to the
sensor as the CS700 or CS700H.
The CS700 and CS700H ship with:
(1) Allen Wrench from Original Mfg.
(1) Instruction Manual
CS700H-AC Version also ships with:
(1) Power Supply and Mounting Hardware (Quint Power made by Phoenix
Contact)
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