RainMaster DX2 series Manuel utilisateur
Rain Master Irrigation Systems DX2 User Manual
Page 232 Appendix A: Flow Meters
Appendix A
Flow Meters
The Evolution DX2 series controller provides a variety of user-
configurable, flow-related features for either one or two flow
sensors, referred to as Flow #1 and Flow #2.
The Evolution DX2 flow features/capabilities include:
•Display of instantaneous flow rate in gallons per minute
(GPM) for Flow #1, Flow #2 and total (Flow #1 + Flow
#2). Flow rates are updated every ten seconds.
•Display of monthly flow accumulations in gallons for
Flow #1, Flow #2 and total (Flow #1 + Flow #2). Flow
accumulation in gallons is updated every minute.
•Automatic termination of watering based upon flow
limit violations:
oMain line flow rate for controller (GPM)
oMaximum flow rate per station (GPM)
oMinimum flow rate per station (GPM)
oMaximum flow accumulation per month
(gallons)
oUnscheduled flow rate for controller (GPM)
•Automatic condemnation and reporting of
stations violating flow limits. Warning
information is provided in the Field
Maintenance Activity and Troubleshooting
section of the manual.
•Automatic establishment of station upper and
lower flow limits (learn mode).
Appendix: A
Flow Meters
Rain Master Irrigation Systems DX2 User Manual
Appendix A: Flow Meters Page 233
Flow Meter Operation Overview
In order to display flow rate and/or flow accumulation data:
a. Insure flow sensor/meter has been properly connected
Refer to Flow Sensor Installation Instructions
b. Establish the appropriate flow calibration criteria, see
"Flow Meter Offset and K Values
In order to establish flow limit checking either on a controller or
individual station basis, verify the following:
c. Steps a and b (above) have been performed.
d. Station Upper Limits have been established, see "Max
Flow Limit".
e. Station Lower Limits have been established, see "Flow
Limit" page or "Auto Limits".
f. Main flow limits have been established, (see "Main
Flow".
g. Total Monthly Flow has been set, see "Flow Options".
h. Unscheduled Flow Limit has been defined; see
"Unscheduled Flow Limit".
i. The upper and lower limit checking is enabled; see
"Enable/Disable Limit Checking".
j. The appropriate flow limit check delay has been
established, see "Delay Limit".
k. Selection of either one or two flow meters, see
"Flow Meter Compare Limits".
Rain Master Irrigation Systems DX2 User Manual
Page 234 Appendix A: Flow Meters
Flow Reading Accuracy
Since the Evolution DX2 controller has been designed to work
directly with flow sensors, the accuracy of the actual readings
are limited only by the flow sensor devices. Typical accuracy
values are approximately 1%.
Flow Meter Offset and K Values
Each flow meter installation must include entry of the "offset"
value and "K" values for proper calibration of the meter. Use the
following table to determine the appropriate values for your
installation.
Rain Master Irrigation Systems DX2 User Manual
Appendix A: Flow Meters Page 235
Table 3: Calibration Table
Tee Mounted Sensors – Flow Sensors
CONNECTION
TYPE
NPT female
NPT female
NPT female
N
PT female with
copper male
adapters
N
PT female
Slip
Slip
Slip
Slip
BODY
MATERIAL
Bronze
Bronze
Bronze
Bronze
Bronze
PVC
PVC
PVC
PVC
Requires pipe saddle with 2 Inch
female NPT
OFFSET
VALUE
27
32
24
0
370
0
104
483
834
K VALUE
109
209
291
750
1021
457
776
2268
3752
See attached table RMIS
Part No. 500712
MAXIMUM
WATER
PRESSURE
400 PSI
400 PSI
400 PSI
200 PSI
200 PSI
100 PSI @
68º F
100 PSI @
68º F
100 PSI @
68º F
100 PSI @
68º F
400 PSI
SUGGESTED
OPERATING
RANGE
2-40 GPM
3-60 GPM
4-80 GPM
10-100 GPM
16-160 GPM
5-100 GPM
10-200 GPM
20-300 GPM
40-500 GPM
Varies, Call
Factory
PIPE
CONNECTIO
N
SIZE
1 Inch
1 ¼ Inch
1 ½ Inch
2 Inch
2 ½ Inch
1 ½ Inch
2 Inch
3 Inch
4 Inch
3 to 40 Inches
RAIN MASTER FLOW SENSORS
SELECTION CHART
FLOW SENSOR
MODEL NO.
FS-B100
FS-B125
FS-B150
FS-B200
FS-B250
FS-150
FS-200
FS-300
FS-400
FS-INSERT-B
Rain Master Irrigation Systems DX2 User Manual
Page 236 Appendix A: Flow Meters
Data Industrial Tee Mounted Sensors
Complete calibration tables for Tee mounted sensors are listed at
the end of this appendix.
Flow Limit Checking
To perform limit checking, the controller computes a Gallon-
Per-Minute (GPM) flow rate based upon the total gallons used in
the previous 60 seconds.
Limit checks are then performed on the following:
•Station upper limit
•Station lower limit
•Main flow limit
•Total monthly flow limit
•Unscheduled flow limit
Each station limit can be automatically established by the
controller or manually entered.
Details about each limit are given below.
Station Upper Limit
Enter an upper flow limit for the station, as described in Chapter
4. The controller compares the flow meter reading to the station
limit. If the meter value is larger than the limit, an error
condition is detected.
Warning: Limit checking is only performed when either the
upper and/or lower limits have been ENABLED.
Rain Master Irrigation Systems DX2 User Manual
Appendix A: Flow Meters Page 237
The suggested upper limit flow rate should be set to the nominal
flow rate for the station + 20%.
The system default value for upper station limit is 500 GPM.
Obtain the nominal flow rate from the controller display (see
Chapter 7, for the steps in displaying flow rate). You should
allow adequate "settling time" for the flow meter readings before
obtaining the nominal flow rate.
Upper station limits should be increased, if water pressure varies
greatly.
Station Lower Limit
Enter a lower flow limit for the station, as described in Chapter
4. The controller compares the flow meter reading to the station
limit. If the meter value is less than the limit, an error condition
is detected.
To detect a mis-adjusted valve or clogged line, enter a relatively
small (but non-zero) lower limit.
The system default value for lower station limit is 0 (zero) GPM.
Main Flow Limits
Enter the Main Flow Limit, as described in the Main Flow
procedure in Chapter 4. The controller compares the flow meter
reading to controller/main line station limit. If the meter value is
greater than the limit, an error condition is detected.
The system default value for controller/main line limits is 2000
GPM.
The Main Flow upper limit should be set higher than the total of
all simultaneously "on" stations. However, this limit should be
lower than the anticipated flow rate from a main line break.
In Flow Max systems, the total water consumption of all
participating controllers is calculated into the Main Flow limit.
Rain Master Irrigation Systems DX2 User Manual
Page 238 Appendix A: Flow Meters
Total Monthly Flow Limit
Enter a maximum monthly flow limit, as described in Chapter 4.
The controller compares the accumulated monthly flow to
maximum monthly flow limit. If the accumulated flow is greater
than the limit, an error condition is detected.
The system default value for maximum monthly total is NONE.
When NONE is selected, no monthly flow checking is
performed.
If the monthly limit is exceeded, there are two options available,
STOP WATERING and GIVE WARNING. See Chapter 4:
Setup for details on selecting each option.
The system default is: GIVE WARNING.
If the stop watering option is selected, the problem is reported in
the warning list and watering stops.
Watering is restarted when:
•The limit is changed to a larger value
•The limit is changed to None
•A new month begins
If the Give Warning option is selected, a warning is reported in
the warning list and watering continues.
Unscheduled Flow Limit
Unscheduled Flow Limit is defined as any water flow that is not
programmed or under the control of the controller. If a water
flow is greater than the limit and no stations are on, the
controller will shut down the water supply until the condition is
corrected.
Unscheduled Flow conditions may be due to broken water lines,
defective valves, faulty solenoids and etc.
Rain Master Irrigation Systems DX2 User Manual
Appendix A: Flow Meters Page 239
The Unscheduled Flow procedure is given in the Controller
Setup section of Chapter 4. The default limit is 200 GPM.
Enabling and Disabling Flow Limit Checking
Once the station limits have been established, the flow limit
checking (upper and lower limits) may be enabled or disabled.
When upper limits have been enabled, all station upper limits as
well as the monthly water limit will be validated. When lower
limits have been enabled, all station lower limits will be
validated on an individual station basis. See Chapter 4 for the
steps to enable or disable station flow limit checking.
The default setting for limit checking is DISABLED for all
stations.
When they are disabled, no limit checking is performed.
However, the GPM flow and total monthly flow readings are
unaffected.
Delaying Flow Rate Limit Checking
Due to drainage of water lines, the initial flow rate for a station
may be much higher than the station steady state condition. To
prevent erroneous station fault detections, the controller delays a
period of time after a station is turned on before making flow
rate limit checks. This delay may be set from 1 to 6 minutes.
The system default for delay of limit checking is two (2)
minutes.
To establish the proper delay, monitor the GPM flow rate for
each station in the irrigation program (s).
See Chapter 7 for details on monitoring GPM rates.
Rain Master Irrigation Systems DX2 User Manual
Page 240 Appendix A: Flow Meters
Observe which station takes the longest time for its GPM rate to
"settle." Round this time period to the next minute and use this
rounded value as the flow rate limit check delay.
Warning: This delay value establishes the amount of time in
which a main or station line break can be detected
and subsequently shutdown.
Rain Master Irrigation Systems DX2 User Manual
Appendix A: Flow Meters Page 241
Limit Checking with Two Flow Meters
When two flow meters are used, you may select which meter is
used for limit checking. Alternately, you may check the total
flow from both meters.
See Chapter 4: Setup for details.
Flow Meter Reading
Procedure
To observe flow meter readings, from the base menu:
Step 1 Advance to the Measurements Options screen as
follows:
Figure 175: Measurement Options
Step 2 Select F1=FLOW METER.
The meter flow readings for Flow #1 and Flow #2
are shown in Gallons-Per-Minute. Readings are
updated every 10 seconds.
F1=Main Menu
F3=Status
F2=Measurements
|F1|=FLOW |F2|=CURRENT
|F3|=MOISTURE |F4|=ET |F5|=RAIN/WIND |½|
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