| | .gif) | MASS and VOLUMETRIC Gas Flow meters
Gas flow meters of the M and V series use two of the best-studied physical properties of gases to measure flow: Viscosity and Pressure. Differential pressure measurement, across a laminar flow element, results in a flowmeter that is inherently linear. The flowmeters measure differential pressure within the laminar region, to achieve a typical turndown ratio of 100:1. Units are available with a very wide range of measurement, starting at 500 micro-liters per minute full scale to 1500 liters per minute full scale.
The "NON-THERMAL" M series Mass Gas Flowmeters use discrete Absolute Pressure, Differential Pressure, and Temperature sensor measurements within the laminar flow region to determine mass flow. The embedded microprocessor provides a software-based STP calculation compensated for pressure and temperature to standard conditions (1 atmosphere 25º Celsius). The M series address the limitations of thermal mass flow technologies, as there is no "Hot Wire" drift. The unit has an adjustable response time starting from 10 milliseconds. The dynamic display units show mass flow, volumetric flow, temperature and absolute pressure simultaneously. With the push button interface, the user can select the primary display, gas of interest (14 standard gases featured), adjust meter response time or tare the meter at zero flow. The optional battery pack makes for a powerful portable test and calibration tool.
Volumetric Gas Flowmeters of the V series are designed for applications venting to atmosphere, with constant and minimal/no backpressure. They do not include absolute pressure or discrete temperature sensors, which makes them an affordable alternative to mass flowmeters. As with the M series, the Volumetric flowmeters use discrete Differential Pressure sensor measurements within the laminar flow region to determine flow. | |
| | .gif) | Mass & Volumetric Gas Flow Controllers
Laminar Flow Controllers of the MC and VC series utilize a proportional valve coupled to the flowmeter body. Measurements are taken within the laminar region of the flowmeter and the integral PID controller positions the valve according to the set points programmed by the user. These robust, closed-loop devices can accept a 0-5Vdc control set point from either external devices or via direct entry on display equipped units. The controllers can also accept a 0-10Vdc, 4-20mA or RS-232 control input signal, depending on what is preferred by the customer. Independent of the set point voltages, the controllers can be configured for single or dual output signals of the same or different voltages and/or different parameters such as mass flow and temperature or flow and pressure. These mass flow controllers incorporate solid-state Absolute Pressure, Differential Pressure and Temperature sensors to determine flow. The result is an easy to use, fast responding meter that is inherently linear and can display or transmit multiple process parameters. With the RS232 digital link, all the process data is available simultaneously as well as remote set point capability. In a parallel connection, up to 26 units can be individually addressed. Gas units are available from 500 micro-liters per minutes full scale to 1500 liters per minute full scale. (Volumetric controllers do not require absolute pressure sensors or discrete temperature sensors and are therefore less expensive. They are commonly used in applications where input pressure are low and units vent to atmosphere.) | |
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