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10
Conductivity
Measurement range*
30 mS/cm
120 mS/cm
300 mS/cm
Accuracy**
±
2% of reading with a minimum of 20
S/cm
Resolution
1
S/cm
4
S/cm
10
S/cm
* User adjustable
** Undefined when reading > 120 mS/cm
Sample Interval and Methods
The minimum and maximum sample interval plus the various sample methods available for the CTD-
Diver are listed below.
Sample interval
1 sec to 99 hours
Sample methods
•
Fixed length intervals in fixed length or continuous (ring)
memory.
•
Average values over a specified period.
•
Pre-programmed pump tests or user-defined pump tests (no
backup memory).
•
Event-based. In this case the CTD-Diver only stores
measurements once the variation limit set for the conductivity
measurement is exceeded. This variation limit is user
adjustable (no backup memory).
2.7.1
Fixed
When this method is selected, the CTD-Diver will take and store samples in regular time intervals.
For example, with a 10-second fixed record interval, the CTD-Diver will take a measurement every 10
seconds on all channel settings and then store these values in internal memory, with the date and
time.
For the CTD-Diver there are two methods for storing data:
•
Fixed Length Memory The CTD-Diver will take measurements at a sample interval set by the
user, for example every hour. When the number of samples reaches 144,000, i.e. the memory
is full, the CTD-Diver stops measuring.
•
Continuous Memory The CTD-Diver will take measurements at a preset sample interval
data. When the memory fills up, new samples begin overwriting the oldest records.
2.7.2
Averaging
When programmed with the Averaging Sample method, the CTD-Diver samples data at a specified
of these values at the specified averaging rate
(Record Interval).
Example
Record Interval: 1 hour
Sample Interval: 1 Minute
Summary of Contents for CTD-Diver DI28 Series
Page 1: ...CTD Diver DI28x Series...
