ELSEC 774 User manual
774 ENVIRONMENTAL MONITOR
USER MANUAL
774.doc V2.1
CONTENTS
INTRODUCTION...............................................................................................1
BASIC OPERATION .........................................................................................2
Set Button......................................................................................................3
UNITS OF MEASUREMENT.............................................................................4
Ultra-Violet (UV)............................................................................................4
Visible Light...................................................................................................5
Temperature..................................................................................................6
Thermal Radiation (Infrared).........................................................................6
MAXIMUM AND MINIMUM...............................................................................7
DISPLAY...........................................................................................................8
Contrast.........................................................................................................8
Backlight........................................................................................................8
DATA LOGGING...............................................................................................9
Wrap Data.....................................................................................................9
ShowStatus..................................................................................................9
Start Logging.................................................................................................9
Stop Logging...............................................................................................10
Re-Starting logging......................................................................................10
Logger-PC Communications.......................................................................10
Installing the Software.................................................................................13
Viewingthe Results using RView................................................................14
CLOCK............................................................................................................15
Setting the Time..........................................................................................15
Setting the Date...........................................................................................15
Date Format ................................................................................................15
Hiding the Clock..........................................................................................15
MAINTENANCE..............................................................................................16
Battery.........................................................................................................16
Mains Power Supply....................................................................................16
Software Version.........................................................................................16
CALIBRATION ................................................................................................17
Temperature................................................................................................17
UV & Visible Light........................................................................................18
SERVICE ANDSUPPORT..............................................................................19
SPECIFICATIONS ..........................................................................................20
PRINTED 25-Mar-05
1
INTRODUCTION
Using the 774 measurements can be taken ofthe proportion ofUV present as
microwatts per lumen (mW/lumen), the total amount ofUV as milliwatts per square
meter (mW/M2) and the amount ofvisible light present (Lux).
Most objects are also sensitive to temperature. The 774 also measures temperature as
°C or °F and thermal radiation in W/M² or BTU/Hour/FT2
The 774 can be leftfor extended periods to log the above parameters at auser set
interval (10 seconds to 1hour). The saved data can then be transferred to acomputer
for display, graphing etc.
Wealwayswant to improve our products. Ifyou have anysuggestions please send
themto the manufacturer.
2
BASIC OPERATION
To take areading the appropriate yellow button is pushed depending on the
measurement required and the reading is taken.
UV= Ultra Violet (µW/lumen or mW/M2)
Vis= Visible light (Lux or Foot-candles)
T= Temperature (Centigrade or Fahrenheit)
IR= Thermal radiation (Infra Red)
The unit automaticallyturns off 10 seconds after the button is released unless abutton
is held down for over 5seconds, this will cause readings to be taken continuouslyuntil
a button is pressed.
Ifthe Tand UV buttons are pressed together then all parameters are displayed at the
same time. Hold both the buttons down for over 5 seconds for a continuous readout.
Note that the buttons should be pressed firmlyfor asecond or so to ensure reliable
operation.
Typical display:
A
B
C
D
E
Lux
1234
Min: 1.2 21-08:14
Max: 3456 14-09:34
B H L 3/11/99 10:20
A: Units ofmeasurement
B: Current reading
C: Minimumreading since last reset, dayofmonth and time ofminimum
D: Maximumreading since last reset, dayofmonth and time ofmaximum
E: Hshows that the reading is “held” and the unit will turn itselfoff after 10 seconds
ofinactivity. A round blob shows the unit is in continuous reading mode until a
button is pushed, nothing here means that a single reading is being taken.
The Lindicates logging is in operation, Wis shown iflogged data is wrapped.
The current time and date are also shown. Unless theyare hidden bypressing
Set\Clock\Hide-Unhide.
Ifa batterysymbol appears at B it means that the batteries need to be replaced.
Min & Max are reset bypressing Set\Max-Min\Reset (Press Set 3 times)
3
The above format is slightlydifferent for someparameters and can be altered bythe
user ifrequired, see below.
Set Button
The blue Set button is used to access advanced functions, change units etc. Ifit is
pushed once a menu similar to that below is shown:
Max-Min>
Display>
Units>
Clock>
Calibrate>
The first menu item“Max-Min” is highlighted, different menu itemscan be
highlighted using the éand êbuttons. The wanted action is done byhighlighting the
appropriate menu itemand pressing the Set button. To abort without doing anything
press the Xbutton. In some cases a further sub-menu is displayed with more choices.
Elsewhere in this manual directions in the formSet\item1\item2are given. This means
Press Set, select item1in the first menu, press Set again, select item2in the next menu
and press Set.
To take ameasurement without having to look at the displaywhile the reading is
taken (for example where the operators head mayeffect the reading) proceed as
follows:
1. Position the monitor where the reading is to be taken.
2. Push the appropriate button for 1-2 seconds and release.
3. Hold the monitor in position for at least 2 seconds.
4. Without operating anybuttons bymistake move the monitor so the reading
can be noted before it turns itselfoff.
4
UNITS OF MEASUREMENT
Ultra-Violet (UV)
TraditionallyUV has been measured in museumsas the proportion ofultraviolet
present. This result is useful for checking aparticular lampor window because the
proportion ofUV does not change with the distance fromthe light source. Using a
simple rule the amount ofUV on an object can be limited. It is usual to arrange that
the proportion ofUV should not exceed 75µW/lumen in museumsand galleries,
though some organisations tryto keep UV levels below 25µW/lumen
The damage is done bythe total amount ofUV falling on the object so it is useful to
be able to measure this directly,especiallyifnon standard amounts ofillumination are
required. The amount ofUV should be as little as possible but in general should not
exceed 20mW/M2, again some organisations keep the level below 6mW/M2.
Both the above units are displayed when the UV button is pressed, one in large
characters, the other smaller at the bottomofthe screen. Which is displayed where can
be swapped bypressing Set\Units\µW/Lumn-mW/M².
5
VisibleLight
This can be displayed either in Lux or Foot-candles. To change the units press
Set\Units\Lux-Footcandl.
Avisible light readout is provided to control illumination and limit damage done by
visible light. Normal museumlight levels should be limited to 150-250 Lux.
Once measurements have been made the light level can be altered if necessaryand UV
filters can be fitted on windows, fluorescent tubes or other UV producing light sources
as required. These filters often deteriorate over aperiod of years so it is essential to re-
check themperiodically.
Magazine reprints on the subject ofmuseumlighting ,UV etc can be obtained from
the manufacturer.
Suggested light levels for various other purposes are given below:
Corridor, stairs etc 100/150 Lux
Warehouses, storage bays 100/150 Lux
General office work 300/500 Lux
Rough bench/machine work 300/500 Lux
Mediumbench/machine work 500/700 Lux
Drawing offices 750/1000 lux
Fine bench work 1000/1500 Lux
Fine inspection 1500/3000 Lux
Minute work 3000/5000 Lux
6
Temperature
Temperature can be measured in degrees Centigrade or Fahrenheit. To change the
units press Set\Units\°C-°F.
Thermal Radiation (Infrared)
Thermal radiation is measures using athermopile. This is sensitive to all radiation
fromthe near ultraviolet to the far infrared (to about 40µM wavelength). Bydefault
this is measured in W/M² (Watts per square Meter), readings can also be displayed in
BTU/Hour/FT² (British Thermal Units per Hour per square Foot); see the Units menu.
One ofthe features ofathermopile is that it also detects radiation that is being emitted
bythe sensor due to its temperature (an unavoidable law ofnature). This emitted
radiation depends on the temperature ofthe thermopile. The obvious wayto eliminate
this effect is to maintain the sensor at aconstant temperature; but the power required
to do this makes it impossible on abatteryoperated instrument. The 774 compensates
bymeasuring the temperature ofthe sensor and calculating a correction.
7
MAXIMUM AND MINIMUM
The maximumand minimumvalues for each unit are displayed along with the dayof
the month and time the maximumor minimumoccurred.
The values can be reset bypressing Set\Max-Min\Reset (This equates to pressing Set
3 times).
To find the date when maxima&minimaoccurred press Set\Max-Min\Date or Time,
repeat to displaythe times again.
The maximumand minimumvalues are also set when data logging is active.
Table of contents
Other ELSEC Measuring Instrument manuals
