Teledyne 6712FR Connecting External Instruments, Intake Placement 2.6.3 Positioning a Sampler

6712FR Refrigerated Sampler Section 2 Installation/Preparation

2.6.2Intake Placement

2.6.3Positioning a Sampler

2.7Connecting External Instruments

2.7.1Flow Meter

Flow Meter

Connector

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2.7.2 Rain Gauge Connector

For representative samples, place the intake in the main current of the flow stream, not in an eddy or at the edge of flow. Placing an intake at the bottom may produce samples with excess heavy solids and no floating materials, while placement at the top may produce the opposite conditions.

Place the refrigerator on a relatively flat, horizontal surface. Placing the refrigerator on a steep incline may cause the sample to miss the bottle mouth.

When installing the sampler, be sure the vertical distance between the level of the liquid and the pump is as small as pos- sible.

CAUTION

The refrigerator’s lower compartment is not watertight. Do not install in a location where the refrigerator’s lower compartment could become submerged.

The 6712FR sampler can be used in conjunction with several types of external instruments.

To connect the sampler to an Isco open-channel flow meter, 4100 series flow logger, 2100 series flow module, or 1640 Liquid Level Actuator, attach the sampler-to-flow meter cable to the Flow Meter Connector. To connect the sampler to a closed-pipe flow meter, attach an Isco 4-20 mA Input Interface device to the sampler’s Flow Meter connector. Plug the line cord into an AC power outlet. Be sure it is connected to 120 volts AC (optional 230 volts AC). When using the sampler with an external instrument, remember these guidelines:

•Both the sampler and the flow instrument must be on and running a program.

•If using a flow meter, logger, or module for flow pacing, the sampler and the flow instrument must both run programs with flow pacing settings.

•If using a flow meter or flow logger for trigger pacing, the sampler must run a program with flow pacing settings, and the flow instrument must run a program with trigger pacing settings.

•When the sampler runs an event-paced program, it disregards pacing pulses from a flow meter or flow logger. However, the sampler continues to monitor for enable signals.

Connect the rain gauge, SDI-12 Sonde, or Refrigerator Temper- ature Sensor connect cables to the nine-pin Rain Gauge Con- nector. When connecting a rain gauge and an SDI-12 Sonde, or rain gauge and a Refrigerator Temperature Sensor, use the appropriate Y-connect cable. See the Accessories appendix at the end of this manual.

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