Configuring response time in filter mode:
The response time for all models (except E4 or D2) can be configured by the user in
the range of 0.9 to 7.5 seconds (63% step response). This is achieved by adjusting the
“filtering” array size. Slower response typically provides a more steady output signal,
as the instantaneous flow variation (dependent on pump, piping, etc.) is averaged out.
It should be noted that the response time refers to the D/A (analog 4-20 mA) output of
the flowmeter. The LED display has a slower update rate.
In order to set the response time, proceed as follows:
1. Make sure the meter is in “flow” display mode.
2. Press and hold the MENU button until “Flo” is displayed.
3. Release the MENU button.
4. Depending on the output mode, either “PUL” or “ALA” will be displayed.
5. After approximately 5 seconds “FLt” will be displayed.
6. When “FLt” is displayed, press the SET button.
7. The current filter setting will be displayed (2, 4, 8, 16, or 32 samples averaged to
produce the output). The letter “F” will be a prefix to the filter value.
Response time for each setting is as shown in the table:
8. To change the filter array size, press and release MENU. Alternately, you can press
and hold the MENU button and see the values scroll.
9. When the desired filter size is selected, press the SET button.
10. After the filter size is changed, the meter will reboot itself for the changes to take
effect.
Step Response Graphs for Various Filter Settings
The following graphs show some examples of the step-response behavior of the meter
for various filter settings. The output shown is the 4-20 mA flow signal going from
zero to full-scale flow, through a 250-Ω load resistor (no filtering on the analog signal
as shown). It is recommended that the user utilizes a filter component (e.g., a 0.1°F
capacitor across the load resistor) after installation.
RESPONSE TIME VS. FILTER VALUE
Filter Value
Response Time (S)
2
4
8
16
32
0.9
1.4
2.3
4
7.5
MAINTENANCE/REPAIR
Upon final installation of the Series CP/CN/CT/CX, no routine maintenance is required.
The Series CP/CN/CT/CX is not field serviceable and is not possible to repair the unit.
Field repair should not be attempted and may void warranty.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sale” in our catalog and on our website. Contact
customer service to receive a Return Materials Authorization (RMA) number before
shipping the product back for repair. Be sure to include a brief description of the
problem plus any additional application notes.
FCC Compliance
This device complies with part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) This device may not cause harmful interference, and (2)
this device must accept any interference received, including interference that may
cause undesired operation. Changes or modifications not expressly approved by
the party responsible for compliance could void the user’s authority to operate the
equipment.
Note:
This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to part 15 of the FCC Rules. These limits are designed
to provide reasonable protection against harmful interference when the equipment
is operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference
in which case the user will be required to correct the interference at his own expense.
CAN ICES-003(A) / NMB-003(A)
This Class A digital apparatus complies with Canadian ICES-003
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada
1 VOLT/DIV
1 VOLT/DIV
FLT = 16
1 SEC/DIV
FLT = 4
1 VOLT/DIV
FLT = 8
1 SEC/DIV