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Platinum/Optima CVE Refrigerated Sampler
3-30
For example, consider an ISCO 4250 Flow
Meter programmed to send a flow pulse every
100 gallons. If you are required to collect a
sample every 10,000 gallons, you would enter
100 flow pulses. 10,000 gallons

100 gallons =
100 pulses.
If the flow measurement device sends flow rate
data via a 4-20 mA current loop instead of flow
pulses. The sample program needs to be
changed in the SMPL. I
NTERVAL
menu. The
sampler assumes that the current is linear
from 4 mA at zero flow to 20 mA at the
full-scale flow rate.
1. Select the flow input type to 4-20mA.
2. Enter the maximum flow rate (MAX. LPM).
3. Enter the liters between each sample
(SMPL L
ITERS
).
Example: Consider a flow meter output to 20
mA at 1,000 liters per minute, the peak flow
rate of the channel. If you are required to collect
a sample every 5,000 liters, you would enter
5,000 in the SMPL. L
ITERS
menu. The sampler
would totalize the flow base on the MAX LPM
and the flow signal. The sampler will totalize
the liters based on the flow signal. There are no
flow calculations needed, the sampler does that
for you.
3.5.4 Bottles per SampleEvent
Multiple Bottles Only – The sampler places a
sample volume in one bottle or sets of bottles at
each sample event. Use this screen to enter the