Density and mass flow systems

MODEL NDG 421 DENSITY GAUGE
The Model NDG-421 is supplied as a density gauge only, and is normally purchased by clients who wish to measure density only the Mass Flow Computation may be performed in the customers PLC /SCADA system. The NDG-421 is a blind unit that is calibrated via a hand held calibrator  (PTU). This option requires that the ow meter signal be routed directly to the PLC (hard wired 4-20mA).

MODEL MFG 421-AIF MASS-FLOW DENSITY GAUGE
The Model MFG 421-AIF Mass Flow Gauge, has the capability to accept the 4-20mA ow signal directly from the ow meter and will perform all the computation for Mass Flow. The Mass Flow output data is available via the eld bus connection.

MODEL MFG 421-NIF MASS-FLOW DENSITY GAUGE
The MFG-421-NIF Mass-Flow Density Gauge has the capability to accept the ow signal input via the Probus^® connection. The PLC needs to write cyclically, the volumetric flow rate to the MFG-421-NIF.
Note: The format of this number should be a Siemens S7 format, oating-point (IEEE 744, single precision) representation of ow in engineering units e.g. 526,3 m³/h. All the variables normally associated with Mass Flow may be read from our MFG-421 via the Probus® connection (Density - SGU, Dry ow rate –t/h, totalled dry tonnes – t). No digital/analogue input/outputs are supplied with this system.

The Density Sensors comprise a radioactive isotope (source) in holder, gamma radiation detector in housing and pipe clamp assembly.