In many industries the need for monitoring gas flow does not involve hazardous gases or potentially dangerous operating conditions. These applications can include many water and wastewater treatment applications, the HVAC industry, the general use of compressed air, and many other applications using air, nitrogen, argon, etc. In these cases, an explosion-proof electronics enclosure is not required, and may be considered a needless expense. To meet this challenge, Eldridge Products, Inc. now offers the Master-Touch™ Family of microprocessor-based thermal mass flowmeters in an economical enclosure suited to non-hazardous conditions.

For use in Ordinary (Non-Hazardous) area locations:
Type 4X, IP66
Certified to US requirements; Certified to Canadian requirements

In the MPNH Series we have combined all of the features of our Master-Touch™ thermal mass flow meter technology with a convenient ABS enclosure. These new enclosures have a clear polycarbonate cover for viewing the rate and total display. Your installation requirements can be easily accommodated by your choice of in-line or insertion models with 115VAC, 230VAC, or 24VDC configurations, and with either integral or remote displays. The remote style models only need two conductors from the flowbody electronics (5 ohm loop) — no local power is required.The cover can be easily removed for all input/output connections and for access to the 4-button keypad which provides direct control and adjustment of the flowmeter. Both integral and remote configurations are available. So now you can have the accuracy and flexibility of the Master-Touch thermal mass flowmeter for virtually all non-hazardous applications.

Master-Touch™ Technology

EPI’s Master-Touch™ flowmeters incorporate the following subsystems to perform signal processing functions: sensor, bridge controller, microcomputer, and I/O communication outputs. Our proprietary microcomputer performs digital signal processing (DSP) functions utilizing a high speed, high resolution 16-bit analog to digital converter (ADC), a central processing unit (CPU) and a high resolution 14-bit digital to analog converter (DAC). Our CPU is an embedded microprocessor including random access memory (RAM), read-only memory (ROM), a serial communications controller (SCC), and I/O data lines.

Menuing System
In addition to the basic Run Mode for day-to-day operations, the Master-Touch includes a menuing system that is accessed via the 4-button keypad or a PC running EPICommunicator™ software, and now features eight operational menus with their submenu items:

100 *Meter* Menu — This menu is used change the displayed engineering units, change the scaling of the output signals, and reset the stored values for elapsed total, high and low flow rates, timestamps, etc.

200 *Utility* Menu — This menu is used to change a variety of microprocessor parameters, such as the display update rate, the internal date and time, the analog-to-digital (ADC) and digital-to-analog (DAC) signal conversion filters, etc.

300 *Status* Menu — This menu includes a series of submenus which present basic information about the flowmeter set up and status.-

400 *Alarms* Menu — This menu is used to control the relay options, including pulsed outputs, high/low trip points, etc.

450 *E-Log* Menu — This menu is accessed via EPICommunicator’s E-Logger™ module to perform datalogging functions.

700 *S-Curve Fit* Menu — This menu is used to modify the factory calibration with a set of secondary coefficients based on customer data.

750 *PW-Curve Fit* Menu — This menu is used to make adjustments to the linear output signal at specific 5% intervals of the calibrated full scale flow rate.

800 *P-Curve Fit* Menu — This menu is used to access the global C-Factor, change the stored cross-sectional area value, etc.