Bacharach Florite 800 Manual de instrucciones

FLORITE 800

INSTRUCTION 16-9013

Installation/Operation/Maintenance

Rev. 1 – March 1999

Bacharach, Inc.

625 Alpha Drive, Pittsburgh, PA 15238-2878

Phone: 1-800-736-4666 •Fax: (412) 963-2640 •Web: www.bacharach-inc.com

Printed in U.S.A. ® Registered Trademarks

of Bacharach, Inc.

Introduction

The Florite 800 is a battery powered, hand held instrument with a digital

LCD display capable of measuring the velocity, volume flowrate and tem-

perature of air by means of a thermal probe. The unit allows the airstream

area to be entered for volume measurement. Measurements may be dis-

played in either Metric or Imperial units as selected from the keyboard.

After selection, this will be ‘remembered’ by the instrument until reselected

from the keyboard. The attached thermal anemometer probe has a tip

diameter of 1/4” (8mm) and is, therefore, suitable for measurements at

grilles, slot diffusers and in small ducts where large access holes are not

acceptable. The velocity sensor in the probe is compensated for variations in

airstream temperature by means of a second thermistor which also senses,

and displays, the actual airstream temperature in either metric or imperial

units consistent with the units selected for velocity.

The instrument is supplied with batteries. Four 1.5 volt AA size cells are

required which may be either disposable or rechargeable types. Either

‘Standard’ or Alkaline disposable cells may be used but the ‘Standard’ type

will exhibit a relatively short life and are, therefore, not recommended. Low

battery condition is indicated by ‘LOBAT’ appearing on the instrument

display. The cells must be replaced as soon as possible to maintain optimum

accuracy. The battery cells are accessible by sliding the cover (at the rear of

the instrument case) in the direction of the arrow. A tape is provided in the

battery compartment for easy removal of the battery cells. Ensure that the

battery cells are replaced with the correct polarity as indicated in each cell

compartment. Rotate the cell slightly forwards and backwards to check that

the cell is properly seated in the cell compartment.

Operating the Florite 800

After switching the instrument on, it will go through a warm-up procedure in

which the entire set of display segments will light up and then the instru-

ment will count down from 9 to 0. If LOBAT is lit in the display after the

countdown the batteries need to be replaced.

All normal operating instructions can be seen on the rear of the instrument.

Zero the instrument

With the zeroing cap covering the velocity thermistor to isolate it from any

air movement, press ZERO. When zeroed the display ‘Press Zero’ will

disappear. For optimum accuracy it is necessary for the instrument to be

rezeroed with the probe at the operating temperature and zero velocity.

To set a duct area

Press the ‘vel /vol /area’ switch sequentially until ‘Area’ is displayed, fol-

lowed by its current setting in either m2or ft2(depending upon the unit of

measurement previously selected). Area units are automatically converted

when using the ‘I / M’ switch. Increment or decrement the area to its re-

quired value by means of the AREA + or AREA – key. Note that holding

either of these keys down will increment or decrement the duct area at an

increasing rate dependent upon how long the key is held down. Reselect

velocity or volume flowrate mode by means of the VEL / VOL / AREA key.

Using the telescopic probe

Pull on the smallest section, taking care not to damage or stress the probe

tip and ensure that the cable slides freely into the handle end of the probe.

Remove the zeroing cap and ensure that the ‘direction of flow indicator’ on

the probe handle is aligned with the ‘flow arrow’ on the probe cap. Place

probe head into the airstream pointing the arrow (or ‘direction of flow

indicator’ if the head is inside a duct) into the airstream in the direction of

flow and read the velocity and temperature of the airstream. To use the

probe inside ducting a 9.5mm (3/8") diameter minimum hole is required in

the duct wall. It may help to use the joints between the telescopic tubes as

markers to determine the probe head position. When closing down the

telescopic probe, ensure that the cable slides freely back through the probe.

Page 2

Where to Use the Instrument

Large Areas: When measuring velocity or volume flowrate over a large

area, a number of readings must be taken, spaced to give an even coverage of

the whole area. The average of these readings will give the mean velocity

over the whole area or the mean volume flowrate. It should be noted that

quite large variations in readings may be observed and, in general, the

larger the number of readings taken, the more accurate the mean velocity

(volume flowrate) will be.

The mean velocity (or volume flowrate) = the sum of all the readings taken

the number of readings taken.

Grills: When using the instrument on grills, avoid intrusion of the arm and

hand into the face area of the grill. The blockage effect would cause artifi-

cially high velocity over the remainder of the grill, leading to incorrect

readings. The telescopic probe can be useful in avoiding this problem.

Checking the Instrument

The instrument is provided with a SELF TEST routine, called HELP and a

CALIBRATION routine which may be accessed from the SETUP mode. The

calibration is a push-button procedure, with calibration data being stored in

nonvolatile memory. Calibration is in metric units only. For optimum

accuracy, perform a Temperature calibration prior to a Velocity calibration.

SETUP Mode: The SETUP mode is entered as follows: With the instrument

switched OFF: Hold down any key while switching the instrument ON.

The following messages will be sequentially displayed: SETUP then: V *.*

(Instrument’s software version number, which may change) then: Code.

Function Code: The code entered at this point will govern which SETUP

function is chosen. Assuming that the keys are numbered as follows:

Top key = 1 , middle key = 2 and bottom key = 3, then the function key codes

are as given in the following table:

CODE FUNCTION PURPOSE

21132 Calibration mode Push button calibration of temperature

or velocity.

11332 HELP routine To assist in fault diagnosis.

Each code key-press must be made within 15 seconds or the instrument will

revert to its normal ‘read’ mode. Each valid key press will result in a ‘seg-

ment bar’ appearing at the bottom of the display. If a non-valid code is

entered, the instrument will revert to its normal ‘read’ mode.

HELP Routine: ( Code 11332 ) The unit will display ‘HELP’ for a period of

two seconds, and will then display all the display segments with ‘Press Zero’

shown flashing: check that all the display segments are present. Pressing

the ZERO key will move the unit through a series of internal tests. The unit

will display ‘PASS’ if it is functioning satisfactorily or display an error

message if a test has failed. The significance of each error message is as

follows:

Page 3

‘Lobat’ Low battery condition, or fault in low battery circuitry.

The HELP routine will not proceed while this prevails.

Change the batteries and retry.

‘Error 1’ * The eeprom read/write function is not satisfactory.

‘Error 2’ * Reference voltage is incorrect or internal oscillator is faulty.

‘Error 3’ The probe is missing or incorrectly connected.

Calibration routine (Function code 21132 entered). The instrument will

display: ‘CAL’:

TEMPERATURE Calibration Routine. Specialized equipment is required for

temperature calibration, for information please contact Bacharach, Inc.

VELOCITY Calibration Routine. For velocity calibration, a stable air flow is

required with a setting resolution of +/–0.2% of reading and a velocity

accuracy better than +/–0.5% of reading. Bacharach can supply an Open Jet

Wind Tunnel together with associated instrumentation suitable for this

purpose, please contact Bacharach, Inc. for details.

SERVICE AND RECALIBRATION: If a fault or the instrument’s calibration is

suspected, it should be returned to Bacharach, Inc. for repair or recalibration. In

any event, it is good practice to have the instrument checked at least once a

year. If an instrument is not working correctly or requires recalibration, contact

your nearest Bacharach Service Department.

SPECIFICATIONS

Page 4

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