Password*
The password setting restricts access to the Programming and Extended Programming modes. Initially, the password is set to all
zeros and any user can modify the parameter settings. To change the password, press ENTER at the Passwd prompt. The first
digit flashes. Press UP to increment the digit and RIGHT to advance to the next digit. After entering all digits, press ENTER to
store the password and advance to RstPswd. The new password is now required to enter either programming mode. With this
password set, any user is able to reset the stored totals on the monitor.
Reset Password*
The reset password parameter restricts resetting the totals on the monitor. The Passwd must also be set to restrict the total
reset. Initially, the password is set to all zeros and any user can reset the stored totals on the monitor. To change the password,
press ENTER at the RstPswd prompt. The first digit flashes. Press UP to increment the digit and RIGHT to advance to the next
digit. After entering all digits, press ENTER to store the password and return to the Fluid parameter. The reset password is now
required to reset the totals on the monitor.
OTE:N Entering a password in the Passwd screen and leaving the password blank in the RstPswd screen allows for total resets
(not requiring a password), but restricts programming modification.
KFACTORS EXPLAINED
The K-factor (with regards to flow) is the number of pulses that must be accumulated to equal a particular volume of fluid. You
can think of each pulse as representing a small fraction of the totalizing unit.
An example might be a K-factor of 1000 (pulses per gallon). This means that if you were counting pulses, when the count total
reached 1000, you would have accumulated 1 gallon of liquid. Using the same reasoning, each individual pulse represents an
accumulation of 1/1000 of a gallon. This relationship is independent of the time it takes to accumulate the counts.
The frequency aspect of K-factors is a little more confusing because it also involves the flow rate. The same K-factor number,
with a time frame added, can be converted into a flow rate. If you accumulated 1000 counts (one gallon) in one minute, then
your flow rate would be 1 gpm. The output frequency, in Hz, is found simply by dividing the number of counts (1000) by the
number of seconds (60) to get the output frequency.
1000 ÷ 60 = 16.6666 Hz. If you were looking at the pulse output on a frequency counter, an output frequency of 16.666 Hz
would be equal to 1 gpm. If the frequency counter registered 33.333 Hz (2 × 16.666 Hz), then the flow rate would be 2 gpm.
Finally, if the flow rate is 2 gpm, then the accumulation of 1000 counts would take place in 30 seconds because the flow rate,
and hence the speed that the 1000 counts is accumulated, is twice as great.
Calculating K-factors
Many styles of flow meters are capable of measuring flow in a wide range of pipe sizes. Because the pipe size and volumetric
units the meter will be used on vary, it may not possible to provide a discrete K-factor. In the event that a discrete K-factor is
not supplied then the velocity range of the meter is usually provided along with a maximum frequency output.
The most basic K-factor calculation requires that an accurate flow rate and the output frequency associated with that flow
rate be known.
Example 1:
Known values are:
Frequency = 700 Hz
Flow Rate = 48 GPM
700 Hz × 60 sec = 42,000 pulses per min
K-factor
42,000 pulses per min
48 gpm
875 pulses per gallon
= =
K-factors Explained
DSY-PM-00028-EN-02 Page 25 February 2017
To Next Page
Loading...
