ISCO GLS - Connecting External Devices

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GLS Sampler

1-10

1.9 Connecting External Devices

The GLS can be used with external devices that

control the sampler pacing, sampler inhibiting,

or both. The sampler pacing input can control

the rate of sample collection so that it is

proportional to the flow rate of a channel. This

input must be used when the Flow Paced

program option is selected (see Sample Pacing,

section 2.4.1). The sampler inhibit input can

delay the GLS operation until a monitored

parameter meets user-defined conditions.

These devices connect to the 6-pin Flow Meter

Connector located on the back of the GLS

controller. Compatible Isco devices include:

• Pacing and Inhibiting devices:

· 4100 Series Flow Loggers

· 4200 Series Flow Meters

· 2100 Series Flow Meters

• Pacing devices (non-Isco device

interfaces):

· 4-20 mA Input Interface

· Pulse Duration Input Interface

• Inhibiting devices:

· Liquid Level Actuator

Note

Flow pacing input signal (pin C) requirements - a 5 to 15

volt DC pulse or isolated contact closure of at least 25

milliseconds in duration.