Thermohygrograph

Thermohygrograph
June 2000
THERMOHYGROGRAPH deluxe
User Manual
THERMOHYGROGRAPH
deluxe
User Manual
HB 3143-02
COPYRIGHT
The copyright in this document which contains information is vested in
CASELLA CEL LIMITED. The contents of this document must not be used for
purposes other than that for which it has been supplied or reproduced or
disclosed wholly or in part without the prior written permission of
CASELLA CEL LIMITED
CASELLA CEL LIMITED
Regent House
Wolseley Road
Kempston
Bedford
MK42 7JY
Telephone:
+44 (0) 1234 844 100
Fax:
+44 (0) 1234 841 490
E-mail
info@casella.co.uk
Web:
www.casella.co.uk
THERMOHYGROGRAPH deluxe
User Manual
Contents
TABLE OF CONTENTS
CONTENTS . . . . . . . . . . . . . . . .
PAGE
1.
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.
PRINCIPLE OF OPERATION . . . . . . . . . . . . . . . . . . . . . 4
3.
2.1
Humiditity Measurement . . . . . . . . . . . . . . . . . . 4
2.2
Temperature Measurement
2.3
General
PREPARATION FOR USE
. . . . . . . . . . . . . . . . . . . . . . 5
3.1
Removing/Replacing the Drum . . . . . . . . . . . . . . . 5
3.2
Fitting/Replacing the Battery. . . . . . . . . . . . . . . . . 5
3.3
Setting the Clock speed.
3.4
Fitting/Replacing the Chart. . . . . . . . . . . . . . . . . . 6
3.5
Fitting/Replacing the Pens. . . . . . . . . . . . . . . . . . 6
4.
OPERATING THE INSTRUMENT
5.
MAINTENANCE & SPARES
6.
. . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . 9
5.1
Routine Care
5.2
Quarz Clock . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.3
Cleaning
5.4
Service
5.5
Spare Parts. . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATION
Page 2 of 12
. . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
. . . . . . . . . . . . . . . . . . . . . . . . . .
10
11
THERMOHYGROGRAPH deluxe
User Manual
1.
Introduction
INTRODUCTION
This handbook introduces you to the basic operation and features of the
CASELLA
deluxe THERMOHYGROGRAPH.
Thermohygrographs are used to produce a continuous record of the variation
of both the temperature and relative humidity of the atmosphere against
time, by drawing coloured traces on a chart.
Variations in relative humidity can affect many manufacturing processes,
storage of raw materials, weights of items such as wool, paper, tobacco,
confectionery, and computer operation, as well as being an important factor
in human comfort. Since temperature is often linked to changes in relative
humidity, this instrument records both on a single chart.
The THERMOHYGROGRAPH
deluxe model may be ordered with or without a
calibration certificate.
Page 3 of 12
Principle
THERMOHYGROGRAPH deluxe
User Manual
2
PRINCIPLE OF OPERATION
2.1
Humidity Measurement
The element that senses relative humidity is made from several strands of
specially treated human hair, which shorten as relative humidity decreases
and lengthen as it increases. The relative humidity element is connected
through a linkage to the pen arm so that changes are recorded as an ink line
on the chart. The linkage is designed to give a near linear movement over
most of the chart range.
2.2
Temperature Measurement
The temperature element is a bi-metal coil that expands and contracts with
changes in temperature, causing its free end to move. The free end is
connected via a spindle to the pen arm so that changes are recorded on the
chart.
2.3
General
Relative humidity and temperature are recorded on the same chart, so to
distinguish between the two traces, the temperature pen is red while the
relative humidity pen is black.
To allow the pens to pass each other without colliding, the black relative
humidity arm is shorter than the temperature arm, so that the two traces are
displaced in time with respect to each other.
Fibre tipped pens are supplied which contain sufficient ink in the body to
write for approximately 9 months. Replace the pen when the trace grows
too faint to read.
Relative humidity is always scaled from 0 - 100%.
The temperature span for the THERMOHYGROGRAPH
o
deluxe is 50oC, and
o
o
this can be set to cover two alternative ranges: -10 C to +40 C or 0 C to
o
+50 C.
When the instrument is dispatched, a special chart is fitted that gives
instructions for changing the temperature offset to match the range of the
o
o
chart selected. The unit is factory calibrated for 0 C to +50 C.
Page 4 of 12
THERMOHYGROGRAPH deluxe
User Manual
3.
Preparation
PREPARATION FOR USE
Once you have removed the THERMOHYGROGRAPH
deluxe from the
packing you should have
¤ THERMOHYGROGRAPH deluxe,
¤ Tool kit,
¤ Document showing settings for the clock,
¤ Chart drum with lid,
¤ User Manual,
¤ Calibration certificate (supplied only with M109017).
Make sure that all foam packing is removed from inside the
THERMOHYGROGRAPH case. Also make sure that the rubber band which
holds the pen arms together is removed.
3.1
Removing/Replacing the Drum
Before attempting to remove or replace the drum, it is important to move the
pens out of the way by turning the pen lifter control.
To remove the chart drum, first open the top of the unit. Then take off the lid
of the drum by simply pulling it upwards. The drum can now be pulled out by
holding the inside walls of the drum and lifting. Note that the drum may be
fairly tight in a new unit.
To replace the drum, carefully locate it on the clock drive shaft and firmly
push it home.
3.2
Fitting/Replacing the Battery
After removing the drum, the battery access cover can be found on the side
of the clock at the rear of the unit.
To open the battery compartment, use either a coin or flat headed
screwdriver to rotate the cover a quarter turn anti-clockwise. The clock uses
a single AA (MN1500 or LR6) battery, which should be inserted with the
positive end facing outwards. To refit the battery cover, push it into the
battery compartment and rotate the cover a quarter turn clockwise to lock it.
3.3
Setting the Clock speed
With the chart drum removed set the three dip-switches in the clock base to
suit your requirements.
Page 5 of 12
THERMOHYGROGRAPH deluxe
User Manual
Preparation
OFF
1 DAY
7 DAY
1 2 3
1 2 3
1 2 3
31 DAY
990015
1 2 3
Refer to the diagram supplied (or the one above) for the required
switch positions.
3.4
Fitting/Replacing the Chart
1.
Remove the chart drum and its lid as described earlier.
2.
Slide the chart retaining clip upwards and remove any existing chart.
3.
Wrap a new chart around the drum, ensuring that its ends overlap at
the point where the clip fits.
Make sure the paper is a low as possible on the drum so that the
baseline on the chart aligns at the overlap.
Failure to observe these points will cause an error in the recording.
4.
5.
Carefully replace the clip, making sure the chart does not move.
Rotate the pen lifter outwards, moving the pens away from the
spindle.
6.
7.
Lower the clock drum on to the spindle, this is a push fit.
Replace the chart drum lid, aligning the slot in the lid with the chart
clip.
3.5
Fitting/Replacing the Pens
1.
Take one pen out of each sachet.
The short-reach pen with black ink (M118004) fits the short arm and
records relative humidity.
The long-reach pen with red ink (M119003) fits the long arm and is
for recording temperature.
Leave the other pens sealed for future use.
2.
Steady the short relative humidity pen arm between the fingers of
the right hand.
Page 6 of 12
THERMOHYGROGRAPH deluxe
User Manual
3.
Preparation
Hold the short-reach black ink pen in the fingers of the left hand and
slide it on to the arm until it stops. Do not use excessive force or
allow the mechanism to become deformed.
Note:
Pens have a tapered inner section and are a push fit on the pen arms.
4.
Repeat with the long-reach (red ink) pen on the temperature pen arm.
5.
Rotate the clock drum to give the approximate time under the long
(red ink) pen.
6.
Remove and discard the protective caps from the pen tips.
Do not press the pens on to the paper to see how they
write, as this will damage the fine tips of the pens and
prevent ink flow.
7.
Rotate the pen lifter inwards to allow the pens to "almost" touch the
chart.
8.
Rotate the clock drum to show the correct time under the long (red
ink) pen, making the last movement anti-clockwise to eliminate
backlash.
9.
Continue to rotate the pen lifter inwards until the pens rest against
the chart.
Page 7 of 12
Operation
4.
1.
THERMOHYGROGRAPH deluxe
User Manual
OPERATING THE INSTRUMENT
Allow the instrument to stabilise to the temperature and humidity of
it's surroundings.
If possible, choose a place free from draughts, temperature gradients
or sources of variable humidity.
2.
Place a thermometer as near to the bi-metal temperature coil as
convenient and allow the instrument to record for 15 minutes.
3.
Adjust to the correct temperature by turning the knurled headed
screw at the base of the temperature coil.
Clockwise rotation moves the pen
upwards across the chart.
The adjustment is enough to allow the instrument to fit charts within
our standard range.
o
It is not possible to change the 50 C measurement span.
4.
Measure relative humidity with a whirling, sling, or other aspirated
hygrometer.
Do not use stationary or un-aspirated types, as this may
cause errors.
5.
Adjust the humidity reading by means of the screw located behind
the vent holes on the left hand (drum end) lower corner of the
instrument.
Clockwise rotation moves the pen
6.
downwards across the chart.
Check the calibration of the instrument every 2 to 4 weeks.
Page 8 of 12
THERMOHYGROGRAPH deluxe
User Manual
5.
MAINTENANCE & SPARES
5.1
Routine Care
Maintenance
No routine maintenance is required.
Do not oil spindle pivots as this attracts dust which may make the
movement slow and can cause inaccuracy. If the instrument is used in a
dusty environment use a fine brush to remove any dust from the hair and
linkage pivots.
Do not wash the hair with water, except at long intervals or for special
reasons, as wetting the hair will upset the calibration temporarily.
5.2
Quartz Clock
The quartz clock should not require any attention, apart from battery
replacement. Quartz movements contain no parts that can be serviced by
the user. If the clock fails, a replacement must be obtained from Casella at
Bedford.
5.3
Cleaning
Cleaning may be carried out by using a soft damp cloth. Solvents or other
cleaning products should not be used.
5.4
Service
The original setting of the temperature element will remain correct for a long
period and will only need attention in the case of damage. The humidity
element does not have such a long life and will need replacement. The
interval depends on exposure and general care during use.
Indication of the need for replacement is when checks on accuracy show
large errors, when re-adjustment is needed very frequently, or erratic
hysteresis errors are noted.
When a temperature check and a humidity check are necessary, the
temperature check must be carried out first.
Casella's in house service department offers a comprehensive range of repair
and calibration services, designed to effect a fast and efficient back-up for all
our products. The Service Department is operated under the scope of our BSI
registration for products manufactured by us. We will however, undertake the
repair of other manufacturers equipment.
Page 9 of 12
THERMOHYGROGRAPH deluxe
User Manual
Spares
For further information please contact our service department at our Bedford
headquarters. We will be happy to provide quotations for individual repairs or
provide annual maintenance under contract.
We recommend factory service by technicians trained and equipped to repair
your instrumentation.
Should you wish factory repair assistance, send your equipment in a package
equivalent to the original packaging. Insure to full value and ship pre-paid.
Include a letter giving full details with your packing list.
Send to:
CASELLA CEL LIMITED
(Service Department)
Regent House
Wolseley Road
Kempston
Bedford
MK42 7JY
If purchased outside of the United Kingdom, please return to your distributor.
5.5
Spare Parts
When ordering from this list, please quote the catalogue reference number.
M109016
THERMOHYGROGRAPH
deluxe with two pens each
for temperature and humidity (charts to be ordered
separately).
M109017
THERMOHYGROGRAPH
deluxe with two pens each
for temperature and humidity and a calibration
certificate (charts to be ordered separately).
o
o
M107301
Box of 200 Daily charts 0 C to 50 C
M107302
Box of 200 Daily charts
M107304
Box of 200 Weekly charts 0 C to 50 C
M107305
Box of 200 Weekly charts -10 C to 40 C
M107310
Box of 200 Monthly charts 0 C to 50 C
M107309
Box of 200 Monthly charts -10 C to 40 C
M118004
Pack of 2 (short-reach) black humidity pens.
M119003
Pack of 2 (long-reach) red temperature pens.
B124
1.5 volt battery
Page 10 of 12
o
-10 C
o
o
o
to 40 C
o
o
o
o
o
o
THERMOHYGROGRAPH deluxe
User Manual
6.
Specification
SPECIFICATION
Accuracy:
Range:
Time scale:
Sensitivity:
Chart size:
Humidity
±2% of full scale.
±3% between 20% and 80% RH
Temperature
50 C span between -10 C and 50 C
Humidity
0% to 100% RH
Temperature
o
Daily
25hrs at 11.25 mm/hr,
Weekly
168hrs at 1.6 mm/hr,
Monthly
31 days at 8 mm/day,
1 C =
1.64 mm,
1% RH =
0.82 mm,
o
o
o
300 x 90 mm.
Dimensions:
300 x 165 x 145 mm.
Weights:
3.62 kg.
ALTERATION WITHOUT NOTICE
Please note that the contents of this manual may be subject to alteration
without notice.
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THERMOHYGROGRAPH deluxe
User Manual
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