Teledyne 4220 installation and operation guide Flow Meter Introduction

4220 Flow Meter

Section 1 Introduction

•674 Tipping Bucket Rain Gauge

•High Low Alarm Relay Box Non-Isco Products

•IBM Personal Computer or compatible clone with Isco Flowlink software

•Laptop Computer with Isco software

•YSI 600 Multi-Parameter Sonde

Optional Accessories

•4200T Modem - Speech-capable, with connector and cable

•D.O. (dissolved oxygen) and pH parameter probes

•Submerged probe Extension Cables (Vented), in lengths of 25 and 50 feet. (Maximum distance between probe and flow meter with extension cables is 75 feet.)

•Quick-Disconnect Box for Submerged Probe (Allows installation of probe as far as 1000 feet from flow meter.)

•Isco Flowlink Software for data acquisition, storage, and management

•Mounting rings and extensions for the submerged probe.

1.3Operating Principles When measuring flow rate, the 4220 is normally used with a primary measuring device (weir or flume) or other open channel flow arrangement where a known relationship exists between level and flow rate. You can also use the 4220 to measure flow using the Manning equation. The level measuring device is a submerged probe. The flow meter electronically converts the level reading into a properly-scaled flow rate value. The flow meter also provides standard or optional flow-related output signals to be used for:

•Flow-proportional sampler pacing and enabling

•Transmitting level and flow data to an external device on a serial communications loop

•Data transfer to a remote location through a modem

•Control of an external 4-20 mA device

•Data transfer by a laptop computer

The flow meter contains microprocessor-controlled circuitry to calculate level and flow rates from the output produced by the submerged probe, store user programming instructions, operate the display and internal printer. An alphanumeric liquid crystal display (LCD) shows current total flow, level, and flow rate infor- mation. It also prompts you while you program the flow meter during initial setup or subsequent program changes. An internal printer provides a hard copy printout of the information com- puted by the flow meter, plots level or flow rate, and generates reports. Connectors for other equipment you can use with the 4220 Flow Meter are on the right side of the flow meter's case.

1-2