Flow (Code -23 And -33); 4-20Ma Current Input (Code -23 And -33) - Emerson Rosemount 1056 Instruction Manual

Instruction Manual
LIQ-MAN-1056
For use with most pulse signal flow sensors, the 1056
user-selectable units of measurement include flow rates
in GPM (Gallons per minute), GPH (Gallon per hour), cu
ft/min (cubic feet per min), cu ft/hour (cubic feet per
hour), LPM (liters per minute), LPH (liters per hour), or
m3/hr (cubic meters per hour), and velocity in ft/sec or
m/sec. When configured to measure flow, the unit also
acts as a totalizer in the chosen unit (gallons, liters, or
cubic meters).
Dual flow instruments can be configured as a % recovery,
flow difference, flow ratio, or total (combined) flow.
Performance Specifications
Frequency Range: 3 to 1000 Hz
Flow Rate: 0 - 99,999 GPM, LPM, m3/hr, GPH, LPH,
cu ft/min, cu ft/hr.

1.7 4-20mA Current Input (Code -23 and -33)

For use with any transmitter or external device that
transmits 4-20mA or 0-20mA current outputs. Typical
uses are for temperature compensation of live meas-
urements (except ORP, turbidity and flow) and for
continuous atmospheric pressure input for determina-
tion of partial pressure, needed for compensation of live
dissolved oxygen measurements. External input of
atmospheric pressure for DO measurement allows
continuous partial pressure compensation while the
Model 1056 enclosure is completely sealed. (The
pressure transducer component on the DO board can
only be used for calibration when the case is open to
atmosphere.)
Externally sourced current input is also useful for
calibration of new or existing sensors that require
temperature measurement or atmospheric pressure
inputs (DO only).
For externally sourced temp or pressure compensation,
the user must program the 1056 to input the 4-20mA
current signal from the external device.
In addition to live continuous compensation of live
measurements, the current input board can also be
used simply to display the measured temperature. or
the calculated partial pressure from the external device.

1.6 Flow (Code -23 and -33)

Totalized Flow: 0 – 9,999,999,999,999 Gallons or m3,
0 – 999, 999,999,999 cu ft.
Accuracy: 0.5%
Input filter: time constant 0-999 sec., default 5 sec.
Recommended Sensors*
+GF+ Signet 515 Rotor-X Flow sensor
* Input voltage not to exceed ±36V
This feature leverages the large display variables on the
Model 1056 as a convenience for technicians.
Temperature can be displayed in degrees C or degrees
F. Partial pressure can be displayed in inches Hg, mm
Hg, atm (atmospheres), kPa (kiloPascals), bar or mbar.
The current input board can be used with devices that
do not actively power their 4-20mA output signals. The
Model 1056 actively powers to the + and – lines of the
current input board to enable current input from a
4-20mA output device.
Note: this Model 1056 signal input board (23, 33 model
option code) also includes flow measurement function-
ality. The signal board, however, must be configured to
measure either mA current input or flow.
PERFORMANCE SPECIFICATIONS
Measurement Range *[mA]: 0-20 or 4-20
Accuracy: ±0.03mA
Input filter: time constant 0-999 sec., default 5 sec.
*Current input not to exceed 22mA
Section 1.0: Description and Specification
April 2017
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