Campbell Scientific TE525MM TE525, TE525WS, and TE525MM Texas Electronics Rain - Page 18

Troubleshooting, Maintenance

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TE525 Tipping Bucket Rain Gage 7.2.2 Control Port Example This example measures a TE525 rain gage in millimeters. A different multiplier would be entered (TABLE 7-3) for other units. 7.2.2.1 CR1000 Example Program 'CR1000 'Declare Public Variables and Units Public Rain_mm Units Rain_mm=mm DataTable (Rain,True,-1) DataInterval (0,60,Min,0) Totalize (1,Rain_mm,FP2,0) EndTable 'Main Program BeginProg Scan (1,Sec,1,0) 'For TE525MM Rain Gage use multiplier of 0.1 in PulseCount Instruction. PulseCount (Rain_mm,1,18,2,0,.254,0) CallTable (Rain) NextScan EndProg 8. Troubleshooting Symptom: No Precipitation 1. Check that the sensor is wired to the Pulse Channel specified by the pulse count instruction. 2. Verify that the Configuration Code (Switch Closure), and Multiplier and Offset parameters for the Pulse Count instruction are correct for the datalogger type. 3. Disconnect the sensor from the datalogger and use an ohm meter to do a continuity check of the switch. The resistance measured at the terminal block on the inside of the bucket between the black and white leads should vary from infinite (switch open) when the bucket is tipped, to less than an ohm when the bucket is balanced. 9. Maintenance The funnel and bucket mechanism must be kept clean. Routinely check for and remove any foreign material, dust, insects, etc. The following calibration check is advised every 12 months. Field Calibration Check: (1) Secure a metal can that will hold at least one quart of water. (2) Punch a very small hole in the bottom of the can. 12

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TE525 Tipping Bucket Rain Gage
7.2.2 Control Port Example
This example measures a TE525 rain gage in millimeters.
A different
multiplier would be entered (TABLE 7-3) for other units.
7.2.2.1 CR1000 Example Program
'CR1000
'Declare Public Variables and Units
Public Rain_mm
Units Rain_mm=mm
DataTable (Rain,True,-1)
DataInterval (0,60,Min,0)
Totalize (1,Rain_mm,FP2,0)
EndTable
'Main Program
BeginProg
Scan (1,Sec,1,0)
'For TE525MM Rain Gage use multiplier of 0.1 in PulseCount Instruction.
PulseCount (Rain_mm,1,18,2,0,.254,0)
CallTable (Rain)
NextScan
EndProg
8.
Troubleshooting
Symptom:
No Precipitation
1.
Check that the sensor is wired to the Pulse Channel specified by the pulse
count instruction.
2.
Verify that the Configuration Code (Switch Closure), and Multiplier and
Offset parameters for the Pulse Count instruction are correct for the
datalogger type.
3.
Disconnect the sensor from the datalogger and use an ohm meter to do a
continuity check of the switch.
The resistance measured at the terminal
block on the inside of the bucket between the black and white leads
should vary from infinite (switch open) when the bucket is tipped, to less
than an ohm when the bucket is balanced.
9.
Maintenance
The funnel and bucket mechanism must be kept clean.
Routinely check for and
remove any foreign material, dust, insects, etc.
The following calibration
check is advised every 12 months.
Field Calibration Check:
(1)
Secure a metal can that will hold at least one quart of water.
(2)
Punch a very small hole in the bottom of the can.
12