Dwyer RTI - Manual (Page 6)

OpERATIOn
page 8 page 9
Operation of the pulse Output. If the pulse output is being
used (either standard electronic or relay-type), it should pulse
for 0.1 second every time the set number of gallons has been
totalized. If a pulse-responsive metering pump is properly con-
nected to this output, it should stroke periodically. If this does
not occur, see Troubleshooting, back page.
Resettable/non-Resettable Totalizer. Unless the unit has been
ordered with the non-reset option, a RESET prompt is visible in
the lower right corner above the up arrow key, when the display
is in use. Press the up arrow key at any time to reset the totalizer
to zero. (note: If you need to reset a unit that has been ordered
with a non-resettable totalizer, contact Dwyer Instruments Inc.)
1234.1
123456.7
RESET
This key resets total to zero
when in normal run mode.
Operation of 4 to 20 mA Output. If the 4 to 20 mA output is in use
and is correctly connected, the signal should vary between 4 mA
and 20 mA in proportion to the flow, with the top flow rate set by
the user (see Settings, page 8). At no time should the signal drop
below 4 mA. A reading between 0 and 4 mA indicates a fault of
some type, typically in the loop power supply or the connections
(see Troubleshooting, back page). In the rare instance that the
4 to 20 signal fluctuates excessively (“paints”), it may need to
be damped by additional averaging. Contact Dwyer Instruments
Inc. for information on how to increase filtering.
SETTInGS
K-fAcTOR
At a minimum, every Series RTI flow display must be pro-
grammed with the “K-factor”. (This is the number of pulses
that the meter produces per gallon of flow.) If you wish the
RTI to read in units other than gallons, see below.
The K-factor on any Dwyer Instruments Inc. flow sensor
fitting or in-line meter can be found on the model-serial la-
bel. The line reading K = xxxx gives the desired number. For
depth-adjustable sensors, look in the instruction manual
under your pipe size.
Set K. Begin by pressing the SET key once. The prompt SET K
should appear on the display. The digit to the far right will be
blinking. Use the up arrow key to reach your desired value. Then
press the left arrow key to move to the next digit. Repeat the pro-
cess until the entire number is entered. (Note that the decimal is
fixed at three places. If you only have two decimal places for your
K-factor, enter a zero for the third digit.) Press SET to advance.
(note: If unable to set K-factor, the unit is "locked" to prevent
tampering. Please contact Dwyer Instruments Inc. for assistance.)
Set p/flow Alarm. At this screen you may select between pulse
output (P) or flow alarm (A) functions. If the pulse output and
flow alarm features are not being used, this step can be skipped.
The P (pulse output) setting does not affect anything if it is not
being used.
Set P is the default that appears on a new Series RTI. On an RTI
that has been previously set up with flow alarm function, an A will
appear on this screen. To move between P and A screens, firmly
press all three keys for 5-10 seconds, then use the up arrow to
scroll through the three options: P, AL HI (high flow alarm) and
AL LO (low flow alarm).
Set 20 mA. Press the SET key to advance to SET 20 to set the flow
rate in volume units per time unit, at which 20 mA is desired. Use
the up arrow key to reach your desired value. Then press the left
arrow key to move to the next digit. Repeat the process until the
entire number is entered. The processor will automatically scale
the 4 to 20 mA loop accordingly, with 4 mA at zero flow.
Set Decimal point. Press the SET key again for the D prompt.
Pressing the up arrow key switches among no decimal place, one
decimal place, and two decimal places.
Set Time unit. When the SET key is pressed again, a
blinking time unit appears. Press the up arrow key
to select SEC (seconds), MIN (minutes), HR (hours) or
DAY (days) (for example, gal/min, or gal/hr).
To save settings and return to normal operation after entering
settings, press SET again. When the unit is connected to an
operating flow sensor, the rate (larger digits) and total (smaller
digits) indicator numbers should appear in the display.
find your K-factor Here
READInG In OTHER unITS
changing Volume units.
The default K-factor units are
pulses per gallon. To read your total in metric or other
units instead, the standard K-factor must be converted to
the desired volume units. For example, to read in pulses
per liter, the K-factor must be multiplied by the applicable
number shown below.
nOTE: both rate & total will read in whatever units you choose.
To convert K to: Multiply by:
Liters .26418
Cubic Meters 264.18
Fluid Ounces .0078
Cubic Feet 7.48
fixed Depth Meter
changing Time units: To read your rate in liters per sec-
ond (for example), convert the K-factor volume units as
shown above and change the time units to Seconds, us-
ing the Set Time Unit instructions at right.
Set p. From this screen, follow the same process as for Set K
to enter the desired pulse rate. This is the number of gallons
(or whatever units are programmed) between pulses. (note:
Using the pulse output function disables the high and low flow
alarm functions.) (6.1 Hz max output)
Set flow Alarm. From the A screen, use the up arrow key to
choose either AL HI or AL LO and then press the SET key to set
the alarm rate. Use the up arrow and left arrow as above to
reach the desired digits. (note: Using the flow alarm function
disables the pulse output function.)
cAuTIOn: Do not touch up Arrow button un-
less you intend to RESET Total to Zero.
TOTAL IS NOT RECOVERABLE.
WARRAnTy/RETuRn
Refer to "Terms and Conditions of Sale" in our catalog or on
our website. Contact customer service to receive a Returns
Goods Authorization number before shipping your product
back for repair. Be sure to include a brief description of the
problem plus any relevant applciation notes.