Dwyer Instruments IEFB Series, Технические характеристики - Инструкция по установке и эксплуатации, Страница: 26 / 40

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Holding Registers
Device Name: A string, up to 40 characters long, that will be displayed on the LCD (if
present). When reading or writing, all 20 registers must be requested. Strings less than
40 characters shall be 0 padded.
Velocity Unit: Selects the unit of velocity for the value in the velocity register. See
Table 1.
Flow Unit:
Selects the unit of flow for the value in the Flow register. See Table 2.
Volume Unit:
Selects the unit of volume for the value in the Total Flow register. See
Table 3.
Power Unit: Selects the unit of power for the value in the Power, YTD Max Power,
YTD Min Power, MTD Max Power, MTD Min Power, YTD Average Inlet Temperature
and YTD Average Outlet Temperature registers. See Table 4.
Energy Unit: Selects the unit of energy for the value in the Total Energy, Heating
Energy and Cooling Energy registers. See Table 5.
Temperature Unit:
Selects the unit of temperature for the values in the Inlet
Temperature, Outlet Temperature and Temperature Difference registers. See Table 6.
Mass Flow Unit: Selects the unit of mass flow for the value in the Mass Flow register.
See Table 7
Pressure Unit:
Selects the unit of pressure for the value in the Process Pressure
register. See Table 8
Reset Total Flow: When a value of 1 is written to this register, the value in the Total
Flow register is reset to 0. Writing a value of 0 has no effect. This register will always
return a 0 when read.
Rest Device: When a value of 1 is written to this register, the device will perform a
warm reset after 5 seconds. Writing a value of 0 has no effect. This register will always
return 0 when read.
Setting the Date and Time:
The IEFB contains a battery backed real-time clock. Current date and time can be set
with the current date and current time registers. Note, however, that the date and time
will not be updated until a value of 1 is written to the Update Date & Time register.
To ensure the best possible time accuracy, it is recommended to write all the data
and time registers including the Update Data & Time register is a single Modbus®
transaction.
Velocity Probe Location:
This setting indicates where in the system the flow meter is installed with respect to the
Inlet/Outlet RTDs. See Table 9
RTD Location Mapping:
This setting determines where each RTD channel is installed. By default, RTD1 should
be installed in the Inlet and RTD2 should be installed in the Outlet. However, if the
process can flow in reverse (where the Inlet becomes the Outlet) this value will need
to change as well as the Velocity Probe Location.
Heating Changeover Temperature:
Heating Energy is accumulated when the Inlet temperature is greater than the heating
changeover temperature and the Outlet temperature. Similarly, Cooling Energy
is accumulated when the Inlet temperature is less than the heating changeover
temperature and the Outlet temperature.
Process Pressure:
The average or normal pressure of the process fluid. This value is used to determine
the density of the process fluid in order to compute power and energy correctly.
*Default unit
Register Description Data Type Range
0001-0020
0021
0022
0023
0024-0025
0026
0027
0028
0029
0030
0031
0032
0033
0034
0035
0036
0037
0038
0039
0040
0041
0042-0043
0044-0045
0046
Device Name
Velocity Unit
Volume Flow Unit
Volume Unit
% Ethylene Glycol
Concentration
Reset Total Flow
Reset Energy Statistics
Power Unit
Energy Unit
Temperature Unit
Mass Flow Unit
Pressure Unit
Current Date – Year
Current Date – Month
Current Date – Day
Current Time – Hour
Current Time – Minute
Current Time – Second
Update Date & Time
Velocity Probe Location
RTD Location
Heating Changeover
Temperature
Process Pressure
Reset Device
String
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
32bit Float
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
Unsigned 16bit integer
32bit Float
32bit Float
Unsigned 16bit integer
0-7
0-15
0-3
0-100
0 or 1
0 or 1
0-8
0-8
0-3
0-7
0 or 1
2000-2099
1-12
1-31
0-23
0-59
0-59
0 or 1
0 or 1
0 or 1
32 - 248°F
(0-120°C)
2.9-400 psi
0 or 1 VELOCITY UNIT VALUES
Value Unit
*0
1
2
3
4
5
6
7
Feet-per-second (ft/s)
Feet-per-minute (ft/min)
Feet-per-hour (ft/hr)
Feet-per-day (ft/day)
Meters-per-second (m/s)
Meters-per-minute (m/min)
Meters-per-hour (m/hr)
Meters-per-day (m/day)
FLOW UNIT VALUES
Value Unit
*0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Cubic-feet-per-second (ft
3
/s)
Cubic-feet-per-minute (ft
3
/min)
Cubic-feet-per-hour (ft
3
/hr)
Cubic-feet-per-day (ft
3
/day)
Gallons-per-second (gal/s)
Gallons-per-minute (gal/min)
Gallons-per-hour (gal/hr)
Gallons-per-day (gal/day)
Liters-per-second (L/s)
Liters-per-minute (L/min)
Liters-per-hour (L/hr)
Liters-per-day (L/day)
Cubic-meters-per-second (m
3
/s)
Cubic-meters-per-minute (m
3
/min)
Cubic-meters-per-minute (m
3
/min)
Cubic-meters-per-day (m
3
/day)
VOLUME UNIT VALUES
Value Unit
0
*1
2
3
Cubic-feet (ft
3
)
Gallons (gal)
Liters (L)
Cubic-meters (m
3
)
Table 1
Table 2
Table 3