Bacharach Florite 800 Installation, operation & maintenance manual - page 3
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