1.7 Flow (Code -23 and -33)
F
or use with most pulse signal flow sensors, the 56 user-selectable units of measurement
include flow rates in GPM (gallons per minute), GPH (gallons 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 - Analyzer
Frequency Range: 3 to 1000 Hz
Flow Rate: 0 - 99,999 GPM, LPM, m3/hr, GPH, LPH, cu ft/min, cu ft/hr.
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.
1.8 4-20 mA Current Input (Codes -23 and -33)
For use with any transmitter or external device that transmits 4-20 mA or 0-20 mA current
outputs. Typical uses are for temperature compensation of live measurements (except ORP,
turbidity and flow) and for continuous pressure input for continuous measurement of % oxygen
gas. External input of atmospheric pressure for oxygen measurement allows continuous partial
pressure compensation while the 56 enclosure is completely sealed.
Externally sourced current input is also useful for calibration of new or existing sensors that
require temperature measurement or atmospheric pressure inputs. In addition to live
continuous compensation of live measurements, the current input board can also be used
simply to display and trend the measured temperature or the calculated partial pressure from
the external device. This feature leverages the large display variables on the 56 as a convenience
for technicians. Temperature can be displayed in °C or °F. Partial pressure can be displayed in
inches Hg, mm Hg, atm (atmospheres), kPa (kiloPascals), bar or mbar. The current input
board serves as a power supply for loop-powered devices that do not actively power their 4-
20 mA output signals.
Performance Specifications
Measurement Range *[mA]: 0-20 or 4-20
Accuracy: ±0.03 mA
Input filter: Time constant 0-999 sec., default 5 sec.
*Current input not to exceed 22 mA
Description and Specifications 9
Instruction Manual Section 1: Description and Specifications
LIQ-MAN-56 April 2017
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