6700SR Refrigerated Sampler
84
Sampler Enable
Isco flow meters, flow loggers, and PAL 1101s have a programma-
ble sampler-enable feature that lets them enable (start) or disable
(stop) a program according to certain monitored conditions. For ex-
ample these conditions can be level, flow rate, pH, temperature,
percent, rainfall, I/O; or a combination of two conditions.
These flow instruments enable or disable a sampler by sending a
signal to pin F of the sampler’s flow meter connector. The instru-
ment can enable or disable the sampler:
• At a specific time and date.
• When the pH, temperature, level, velocity, or flow rate passes a
set point.
• When the reading is within a certain range or outside a certain
range.
• When the rainfall rate exceeds a set point.
The Model 1640 Liquid Level Actuator can also be used, as well as
any other instrument that can ground the input to pin F. Ground-
ing the input disables the sampler.
A sampler running either a standard or extended program can rely
on external input for enable or disable controls.
The sampler’s extended programming screens let you program the
sampler similar to the way devices controlling pin F are pro-
grammed. Input from a rain gauge, YSI Sonde, programmable I/O
pin, or a module may be used when programming enable condi-
tions. Any combination of up to two conditions can be programmed.
In addition to programming enable conditions, extended program-
ming lets you control the sampler’s response to its enable state.
You can:
• Stay enabled after the first enable.
• Set up a repeatable enable.
• Take a sample at enable or disable.
• Delay the start of sampling after the enable.
• Reset the sampling interval countdown each time the sampler
is enabled.
• Control the sampling interval countdown while disabled.
• Enable Part B of a two-part program when Part A is done.
Once Enabled Stay Enabled
For certain monitoring programs, you may want the sampler to con-
tinue to sample, even though the conditions that enabled the sam-
pler no longer exist. When you use the ONCE ENABLED, STAY
ENABLED feature, after becoming enabled the sampler takes sam-
ples until it reaches the end of its program.
Repeatable Enable
After enabling the sampler, the enabling instrument (or instru-
ments) continues to monitor the conditions and disables the sam-
pler when the conditions are no longer satisfied. If re-enabled, the
sampler resumes the sampling program.
18
ONCE ENABLED,
STAY ENABLED?
YES NO
Once enabled, stay enabled
is
called “sampler latching” in flow
meters, flow loggers, FLOW-
LINK, and PALs. Latching a
sampler produces the same
results as selecting YES; the
difference is that the external
instrument controls the latching.
19
SAMPLE AT ENABLE?
YES NO
20
START SAMPLING
AFTER A
___ MINUTE DELAY
(1-999)
21
RESET SAMPLE
INTERVAL AT ENABLE?
YES NO
22
CONTINUE COUNTDOWN
WHILE DISABLED?
YES NO
Note
Internal Sampler Enable
Screens
Figure 35
,
Extended Programming:
Programmed Sampler Enable
on
page 119.
Figure 39
,
Extended Programming:
Quick View; Programmed
Sampler Enable
on page 123.
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