page 6 of 8
‡ SIGNET
8550-1 Flow Transmitter
The first three characters set the Flow Rate units of measure. They have no effect on
calculations. They may be any alpha or numeric character, upper or lower case.
The last character sets the Flow rate Timebase. Select S (seconds), M (minutes), H (hours)
or D (days).
This setting tells the transmitter how to convert the input frequency from the flow sensor into
a flow rate. The K-factor is unique to the sensor model and to the pipe size and schedule.
Refer to data in the sensor manual for the correct value. Limits: 0.0001 to 99999. (The
K-factor cannot be set to 0)
This setting identifies the Totalizer units. It has no effect on any calculation. It serves as a
label only. Each character can be any alpha or numeric selection, upper or lower case.
This setting tells the transmitter how to convert the input frequency from the flow sensor into
a volumetric total. It also is used as the basis for the Open Collector pulse mode.
The setting is usually the same as the Flow K-factor, or different by x10 or x100. Limits:
0.0001 to 99999. (The K-factor cannot be set to 0)
Select the minimum and maximum values for the 4-20 mA Current loop output. The 8550
will allow any values from 0.0000 to 99999.
Select the desired mode of operation for the Open Collector output. Options available are
High, Low, volumetric Pulse, or Frequency. The signal may be disabled (Off) if not used.
In Low or High Mode, the Open Collector output will be activated when the Flow rate
reaches this value. Be sure to modify this setting if you change the Flow Units.
The Open Collector output will be deactivated at Setpoint
±
Hysteresis, depending on High
or Low Setpoint selection. (See details on page 4.)
In Pulse mode, the Open collector output will generate one pulse when this volume of flow
passes the sensor. The measurement is based on the Total K-factor. The 8550 will allow
any value from 0.0001 to 99999.
In Pulse mode, this setting defines the duration of the Open Collector output pulse. The
8550 allows any value from 0.1 seconds to 999.9 seconds.
In Frequency mode, the Open Collector output will simulate the sensor frequency, divided
by this setting. Set for 1 (input frequency = output frequency). Set for even numbers
(2, 4, 6, 8 . . . 254 maximum) to scale output frequency.
Use this “note pad” to record important dates, such as annual recertification or scheduled
maintenance.
Calibrate Menu
Display
(Factory settings shown)
Description
Flow Units:
GPM
>
Flow K-Factor:
60
>
Total Units:
Gallons
>
Total K-Factor
60
>
Loop Range: GPM
000.00
→
100.00
>
Output Mode:
Low
>
Output Setpnt:
10.0 GPM
>
Output Hys:
5.0 GPM
>
Output Volume:
100.00 Gallons
>
Output PlsWdth:
0.1 Seconds
>
Output Freq.:
Divide by
1 >
Last CAL:
6-30-01
