Operation
The CoolPoint
®
inline flowmeter utilizes the vortex shedding principle. The fluid strikes
a bluff body, generating vortices (eddies) that move downstream. The vortices form
alternately, from one side to the other. A piezoelectric sensor housed in a sensor tube
directly downstream of the bluff senses the pressure zones created by the vortices.
The sensor generates a frequency directly proportional to the vortices (flow). The
pulses are then amplified by the circuit board and converted to a 4-20 mA output,
which is also linear with flow. Flow is displayed on the LEDs in either GPM or LPM.
Selection of the preferred units of measure is made by using the SET push button.
A solid-state relay can also be set for a low-flow alarm, typically from 15% to 90% of
full-scale flow. The relay can be configured to be either NC (normally-closed) or NO
(normally-open), or for a pulse output.
CT flowmeters can combine temperature measurement with the flow-measuring
feature. An internal temperature sensor, housed in a small thermowell downstream
of the flow sensor, measures the liquid temperature. Temperature can be displayed
in either degrees Fahrenheit or Celsius, and is selected by using the SET push
button. There is an independent 4-20 mA output proportional to temperature and an
independent solid-state relay that can be configured as a high temperature alarm.
The relay state (NC or NO) is the same as that selected for flow alarm. The user can
select either flow or temperature to be displayed on the LEDs by using the MENU
push button.
Cleaning: These meters do not require any special cleaning of the external surfaces.
If cleaning is deemed necessary, strong solvents, detergents, or chemicals should not
be used. A damp cloth may be used to wipe off dirt or debris.
FLOW SET POINT RANGES
Meter Size
Setpoint Min. Setpoint Max. Hysteresis
GPM LPM GPM LPM GPM LPM
1/4˝
3/8˝
1/2˝
3/4˝
1˝
1 1/2˝
2˝
3˝
4˝
0.4
0.6
1.2
3
7.5
15
30
40
80
1.5
2.3
4.5
11
30
56
113
151
302
3
6
12
22.5
45
90
180
280
560
12
23
45
85
170
341
682
1059
2119
0.1
-
-
1.2
2.5
5
10
15
30
0.4
-
-
5
9
18
37
57
114
TEMPERATURE SET POINT RANGES
Meter Size
Setpoint Min. Setpoint Max. Hysteresis
°F
°C
°F
°C
°F
°C
All CT Models 35
1
200
93
4
2
SETUP AND CONFIGURATION
Factory Default Settings
Flow Units: GPM
Set Point: 00.0. NO/NC is set to NC. Flow averaging filter set to F 08.
Temperature Units: °F
Initial Power Up
Upon supplying the initial DC power, the unit goes into a set-up mode. First, it will
energize the LED display, showing that all segments of the display functions (8.8.8. is
displayed), along with the GPM/LPM LEDs. Then it will display the firmware revision
by stating the revision (4.5P for example). Then finally, it will go into the run mode and
give the flow rate (or if no flow, 00.0).
When a flow alarm occurs, the second LED (either GPM or LPM) will blink as a visual
indicator. Please note the solid LED indicates engineering units of the display and
blinking indicates a flow alarm.
One of the two LEDs is lit all the time. Use the SET push button to toggle between the
two. If flow is available, the GPM and LPM flow rates will be displayed (again the LPM
flow rate is greater than the GPM).
Model CT
In addition to the above-mentioned LEDs, there are two more individual LEDs for
temperature – °F and °C. If the meter is displaying flow, these LEDs are off. Use the
MENU push button to toggle between “flow” and “temperature” displays.
When the “temperature” display is selected, the GPM and LPM LEDs turn off and
either the °F or the °C LED lights up. Use the SET push button to toggle between °F
and °C.
Flow Alarm - If a low-flow alarm occurs while the meter is displaying temperature, both
GPM and LPM LEDs start blinking. If the meter is in “flow” display mode, the °F and °C
LEDs remain off and either the GPM or LPM LED blinks.
Temperature Alarm – If a high-temperature alarm occurs while the meter is displaying
flow, both °F and °C LEDs start blinking. If the meter is in “temperature” display mode,
both the GPM and LPM LEDs remain off, and either the °F or °C LED blinks.