Australian company APCS designs and supplier signal conditioning modules used in industries as varied as mining, utilities, agriculture, building management and food processing. The company's product range of over 200 individual products includes signal isolators, transmitters, process alarms, power supplies and electrical transducers.
The USC701 Universal Signal Conditioner combines measurement and control functions in a single instrument and provides user-selectable solutions for most signal conditioning applications including PID control.
The device configuration can set up and altered via:
* A plug-on Access Module AM702 which has a two line by eight character display and five pushbuttons and incorporates a menu structure.
* A plug-on Computer Adapter COA703 that interfaces PC-based USC configuration software.
* A select switch and encoder are accessible on the top of the USC which allow for the setting of a number of calibration parameters.
The USC701 can be configured for calculating gas flow rate with temperature and pressure compensation and will produce a 4-20 mA output proportional to the gas flow rate. This rate is calculated from the following equation:
m = P*A*v / R*T
where the units are:
m - mass flow rate: kg/sec
P - pressure: kPa
A - cross-sectional area of flow: m²
v - gas velocity: m/sec
R - gas constant: kPa*m³/kg*K
T - temperature: °K
Configuration parameters
The gas constant has to be entered for the particular gas. This is using the COA703 or the AM702 in trim mode. Some examples are:
* 0,287 (air).
* 0,189 (CO2 carbon dioxide).
* 0,297 (CO carbon monoxide).
* 0,518 (CH4 methane).
* 0,276 (C2H6 ethane).
The information for the cross-sectional area of flow is entered in a similar way.
Inputs and output
The gas velocity input is via the pulse input P1 channel of the USC701 and the appropriate signal type and calibration is configured in the P1 input section.
The pressure input is via the CH1 input channel. The appropriate signal type (for instance 4-20 mA) and calibration is set in the CH1 input section.
The temperature input is via the CH2 input channel. The appropriate signal type (for instance 4-20 mA) and calibration is set in the CH2 input section.
The user can configure the 4-20 mA output to represent the required mass flow.
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