Campbell-scientific CR1000 Measurement and Control System Manual de usuario descargar pdf (Pagina 156)

100

101

Section 7. Installation

156

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Table 23. Calibration Report for Salinity Sensor

Parameter

Parameter at

Deployment

Parameter at 7-Day

Service

mV output 1350 mV 1345 mV

KnownSalt (standard

solution)

30 mg/l 30 mg/l

Multiplier

0.05 mg/l/mV 0.05 mg/l/mV

Offset

-37.50 mg/l -37.23 mg/l

RH reading 30 mg/l 30 mg/l

1. Send the program in CRBasic example FieldCal Offset Demo Program (p. 156)

to the CR1000. An excitation channel has been programmed to simulate a

sensor output.

2. To simulate the salinity sensor in deployment-calibration conditions (30 mg/l

standard solution), place a jumper wire between channels VX1/EX1 and SE6

(3L). Set variable mV to 1350. Set variable KnownSalt to 30.

3. To simulate the deployment calibration, change the value in variable CalMode

to 1 to start calibration. When CalMode increments to 6, offset calibration is

complete. Calibrated offset will equal -37.48 mg/l at this stage of the example.

4. To continue this example and simulate an offset-drift condition, change

variable mV to 1345.

5. To simulate 7-day, service-calibration conditions (30 mg/l standard solution),

set variable KnownSalt to 30.0. Change the value in variable CalMode to 1 to

start calibration. When CalMode increments to 6, 7-day, service-offset

calibration is complete. Calibrated offset will equal -37.23 mg/l.

CRBasicExample27. FieldCal()OffsetDemoProgram

'Jumper VX1/EX1 to SE6(3L) to simulate a sensor

Public mV 'Excitation mV output

Public KnownSalt 'Known salt concentration

Public CalMode 'Calibration trigger

Public Multiplier 'Multiplier (starts at .05 mg / liter / mV,

'does not change)

Public Offset 'Offset (starts at zero, not changed)

Public SaltContent 'Salt concentration

'Data Storage Output of Calibration Data -- stored whenever a calibration occurs

DataTable(CalHist,NewFieldCal,200)

SampleFieldCal

EndTable

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