4220 Flow Meter
Section 1 Introduction

1-9

Flowlink Data Storage and Retrieval System
Memory Partitions Maximum of 6 user-defined memory partitions for level or event stor-
age.
Data Storage Rate of data storage user-selected in 1, 2, 5, 10, 15, 30, 60, or 120
minute intervals.
Baud Rates Serial connection - 300, 1200, 2400, 4800, or 9600 baud.
Serial connection with the optional internal modem - 2400 baud.
Storage 80,000 bytes, apportioned per reading as follows: flow = 4 bytes,
level = 2 bytes, sample = 4 bytes, pH or D. O. = 1 byte)
Level Data Level readings are stored as a 16-bit number representing .1mm
(0.0394 inch); effective range is 0–65279 meters.

Flow Conversion

Flow Rate Calculations The flow meter creates a table of level-versus-flow rate from program
selections; this table divides the level span into 256 equally-spaced
level increments. Each level increment corresponds to a specific flow
rate. During data collection, if the measured level falls between two
table values, the flow meter will perform a linear interpolation to calcu-
late the flow rate value.
Table 1-2 Technical Specifications for the 4220 Flow Meter (Continued)Table 1-3 Technical Specifications for the 3222 Submerged Probe

Physical Specifications

Dimensions 7⁄8” diameter × 91⁄2" long (2.2 × 24.1 cm).
Weight 3 lb, (including amplifier box and cable) (1.4 kg).
Body Material CPVC (chlorinated polyvinyl chloride) housing, stainless steel.
Cable Length 25 ft. (7.6 m).
Operating Temperature 32° to 160°F (0° to 71°C).
Storage Temperature –40° to 160°F (–40° to 71°C).
Maximum Distances
(between flow meter and level sen-
sor)
75 feet (22.7 m) with optional extension cables.
1,000 feet (305 m) with optional Quick-Disconnect Box.

Level Measurement Specifications

Measurement Range 0.1 to 10.0 ft. (0.03 to 3.05 meters).
Maximum Level 20.0 ft. (6.1 m).
Measurement Accuracy Standard Sensor:
0.033 to 5.0 ft: ±0.008 ft/ft (0.01 to 1.52 m: ±0.008 m/m)
>5.0 ft: ±0.012 ft/ft (>1.52 m: ±0.012 m/m)
@ 77° F (25° C). Includes non-linearity, repeatability, and hysteresis, but does not
include temperature coefficient.
Specifications include nonlinearity, repeatability, and hysteresis, but do not
include a temperature coefficient.