Teledyne 4250, Installation And Operation Manual, Page: 21 / 204

4250 Flow Meter
Section 1 Introduction
1-9
Display Type 2-line, 40 character/line alphanumeric dot matrix liquid crystal.
Power 12 to 14 VDC; 14 mA average at 12.5 VDC (printer set at 1" per hour, 1 minute level
reading interval, 5 minute velocity reading interval.)
Typical Battery Life (Standard 4 Ampere-hour nickel-cadmium battery.) 8 to 11 days with printer set at 1"
per hour, 1 minute level reading interval, 5 minute velocity reading interval. 15 days
with printer turned
off .
Operating Temperature 0 to 140
o
F (–18 to 60
o
C).
Storage Temperature –40 to 140
o
F (–40 to 60
o
C).
Additional Power Required for Optional Equipment
Modem 60 mA maximum during operation; 0.1 mA maximum standby.
High-Low Alarm Relay Box 10 mA standby, typical; 190 mA - both relays operated.
Internal Printer
Chart Speeds Off,
1
/
2
, 1, 2, or 4 inches per hour.
See Table 1-5 for longevity in days.
Ribbon 19.7 ft. (6 m) black nylon - replaceable.
Operating Speed 1.5 lines per second at 68
o
F. (20
o
C).
Character Size 0.09" high

0.07" wide (2.4mm

1.7 mm), 12 pitch.
Printer Recording Span
Chart Resolution
Display Resolution
User-selected from
1
/
4
ft. (3.6 cm) to over 30 ft. (9.1 m) with multiple over-ranges.
1
/
240
of selected recording span
0.001 ft. (0.3 mm)
Paper 4.5" wide

58 ft. (11.4 cm

17.7 m) plain white paper, replaceable.
Printer Reliability 2.5 million lines MCBF (mean cycles before failure).
Reports Printed Program selections, interval activity reports, flow meter history.
Printer Recording Modes Level, flow rate, rainfall, temperature, velocity, pH (or) D. O.; includes totalized flow,
sampler events,
Plotted Linear Data 3 different linear plots can be printed at the same time.
Flowlink Data Storage and Retrieval System
Memory Partitions Maximum of 6 user-defined memory partitions for level or event storage.
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); effec-
tive range is 0–65279 meters.
Table 1-2 4250 Technical Specifications