Campbell Scientific 43347 RTD Temperature Probe and 43502 Aspirated Radiation Shield - Manual (Page 7)

43347 RTD Temperature Probe,
43502 and 41003-5 Radiation Shields
1. General
The -L option on the model 43347 RTD Temperature Probe (43347-L), and the
43502 Aspirated Radiation Shield (43502-L) indicates that the cable length is
user specified. This manual refers to them as the 43347 probe and the 43502
radiation shield.
The 43347 is a 1000 ohm Resistance Temperature Device (RTD) used to
measure ambient air temperature and delta or gradient air temperature. The
standard 43347 probe has an uncertainty of
±0.3°C. For increased accuracy,
the 43347 probe can be ordered with a three point calibration with an
uncertainty of
±0.1°C.
There are two cable options for the 43347. Option –VX configures the probe
as a 4-wire half bridge that requires a voltage excitation and two differential
input channels, and can be used with all CSI dataloggers except the CR200(X).
Option –IX configures the probe for use with the CR3000 or CR5000
dataloggers, and requires a current excitation and one differential input
channel.
The 43347 can be housed in the 41003-5 naturally aspirated radiation shield, or
the 43502 motor aspirated radiation shield. The 43502 radiation shield
employs concentric downward facing intake tubes and a small canopy shade to
isolate the temperature probe from direct and indirect radiation. The 43347
probe mounts vertically in the center of the intake tubes. A brushless 12 Vdc
blower motor pulls ambient air into the shield and across the probe to reduce
radiation errors.
The 43502 blower operates off a 115 Vac/12 Vdc transformer that is included
with the shield, or from a user-provided 12 Vdc source. The blower has a
‘Tachometer’ output that can be measured with a control port or pulse counter
input on the datalogger, and the output frequency stored as part of the data to
insure the blower was operational.
Lead length for the 43347 and 43502 is specified when the probe/shield is
ordered. Maximum cable length for the 43502 is 75 ft (22.8 m), which is based
upon 22 AWG wire, 500 mA current draw, and an allowance for a 1 V voltage
drop across the cable. Larger diameter wire could be used for longer cable
lengths. With 18 AWG wire, the maximum length is 200 ft (60.9 m).
The 43347 probe ships with:
(1) Instruction Manual
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