Meriam M2110F SMART FLOW GAUGE - Manual (Page 4)

4
1 OVERVIEW
The Meriam Instrument M2110F Gauge is a microprocessor based flow-sensing device that can be used in
conjunction with a primary flow element to measure flow rate of clean dry gases. Compatible primary elements
include Laminar Flow Elements (LFE), Accutube and Orifice plates. The gauge operates on the principle of
measuring differential pressure across the primary element then calculating the flow rate based on user scaling input.
The calculated flow rate is then displayed in the selected engineering unit or output for process control or
monitoring.
1.1 Features
• Microprocessor –control for reliability and flexibility
• Remote control via RS232 serial link using ASCII character transfer
• Parameters to allow easy configuration of the unit
• Built-in non-volatile memory for storing register settings
• 4-½ digit LCD display with backlight for flow readout
1.2 Models
• Battery Powered Display Indicator only
• Current Loop Model with 4-20 mA Flow Rate Output and RS232 serial interface port
• 10 inH
2
O sensors available
• AC powered models have an RS232 serial interface port and SPDT outputs
1.3 Flow Calculation Model
1.3.1 Laminar Flow element
Flow = B_Coefficient * dP + C_Coefficient * dP
2
Where: dP = Differential pressure (inH
2
O @ 4
ºC)
B-Coefficient and C-Coefficient are provided with the LFE
1.3.2 Accutube or Orifice Plate element
Flow = Flow Constant *
√dP
Where: dP = Differential pressure (inH
2
O @ 60
ºF)
Warning
The user must scale the gauge for the correct flow measurement display by entering the proper values of the
Measurement Model, B-Coefficient, C-Coefficient and or Flow Constant.