Teledyne 4250, Installation And Operation Manual, Page: 20 / 204

4250 Flow Meter
Section 1 Introduction
1-8
Table 1-1 4250 Controls, Indicators, and Connectors
CONTROLS SETTINGS FUNCTION
ON/OFF On - Off Turns the flow meter on and off. Internal memory is protected with a standby
battery. See
Section 2.
Keypad Momentary
Switches 24-key. 4 column matrix - Program flow meter through series of keystrokes
prompted by messages on the display. Certain keys perform specific functions,
(printing reports or entering program choices into memory). Arrow keys move
through menus. Number keys enter numeric values. See
Section 2.
INDICATORS READING FUNCTION
Display Multi-function 2-line, 40 characters per line, liquid crystal display (LCD.) Prompts you through
program procedure; displays total flow,. present flow rate and level. May also
display parameter readings, if sensors present.
Internal Plotter Various Provides hard copy of total flow, level or flow rate variation over time; provides
sampling information and a printout of the program. Prints reports. Generates
up to 3 different linear data plots. Chart characters and plots are generated on
plain paper roll with an ink ribbon.
CONNECTOR TYPE FUNCTION
12 VDC 2-pin male M/S Connects 12 VDC power to flow meter
Sampler 6-pin male M/S Connects flow meter to sampler. Provides 12V flow pulse to sampler (pulse
width 78 ms). Receives sampler bottle number, composite sample, and event
mark signal.
Rain Gauge/
YSI 600 Sonde 9-pin female M/S
(Custom)
Connects flow meter to a Isco Rain Gauge or YSI 600 Multi-Parameter Sonde.
Also provides output to High Low Alarm Relay Box.
Interrogator 6-pin female M/S Provides serial data in/out and power. Can also be used with 4-20 mA Output
Interface.
Modem
(optional)
Analog Output
(optional)
5-pin male M/S
6-pin male M/S
Connects flow meter to telephone line for remote data transmission. This con-
nector will only be present on units that have the optional modem installed.
Provides analog data output from the flow meter to external, non-Isco control
and recording devices.
Parameter 7-pin female M/S Connects flow meter to parameter sensor: temperature, pH, or D. O. Note that
you can only have temperature and one parameter (pH or D. O.) at the same
time.
Area Velocity
Sensor 9-pin custom spe-
cial connector Connects flow meter to area-velocity sensor. Also provides connection for inter-
nal vent tube from sensor.
Table 1-2 4250 Technical Specifications
Physical and Electrical
Size 16" high

11
1
/
2
” wide

10
1
/
2
"

deep (40.6

29.2

cm) (without power source
attached).
Weight 17 lb. 4 oz. (7.8 kg)
Material High-impact molded polystyrene structural foam.
Type Self-certified NEMA 4X Enclosure.