Omega Engineering FLR1000 manual Operation, Start Up, Flow Readings, 5VDC Analog Outputs

C.Operation

CAUTION: DO NOT FLOW ANY LIQUID THROUGH A GAS

FLOW SENSOR OR FLOW METER. THIS WILL SERIOUSLY

EFFECT THE PERFORMANCE AND VOID THE WARRANTY.

1.Start Up

Before applying power to the unit check all tubing and electrical connections. Once correct installation is verified switch on the power.

2.Flow Readings

The FLR 1000 Series for gases provide a 0-5VDC output proportional to the volumetric flow rate.

The FLR 1000-D and FLR 1000-BR-D series feature an integral 3.5 digit display that provides a local flow reading and a 0-5VDC analog output proportional to the volumetric flow rate.

Each unit is factory calibrated for a specific flow range. The flow range is shown on the unit’s label and calibration certificate. Units are calibrated using AIR as the reference media unless otherwise noted. Calibrations are carried out with the mounting feet horizontal on a flat horizontal surface.

a)0-5VDC Analog Outputs

By monitoring the voltage output signal it is possible to determine the flow rate of the gas. Units are configured so that an output signal of 5.0VDC is provided when the maximum flow (i.e. Full Scale flow) is passing through the unit. The output signal is linear and scaleable enabling calculation of flow rates within the sensor’s range.

For example:

For a flow range of 100-500ml/min:

At 500ml/min the output signal would be 5VDC

If the output signal were 3.5VDC then the flow rate would be:

(500 ÷ 5) × 3.5 = 350ml/min

If the maximum flow rate is exceeded non-linear and inaccurate readings will result.

b)Units With an Integral Display

The FLR 1000-D and FLR 1000-BR-D series features an integral 3 ½ digit LCD display. This is configured to read in ml/min for flow ranges up to

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