OAKTON 37250-00, 08369-50, 37250-10, 37250-20, 08369-70 Instruction Manual
OPERATING INSTRUCTIONS
OAKTON®Models 08369-50, -70
37250-00, -10, -20
Hygrothermographs
Printed in the U.S.A. 1/00
00703-07
10. Warranty
OAKTON warrants this instrument to be free from significant deviations in material
and workmanship for a period of one year from date of purchase. If repair or
adjustment is necessary and has not been the result of abuse or misuse within
the warrantied time period, please return—freight prepaid—and correction will
be made without charge. OAKTON alone will determine if the product problem
is due to deviations or customer misuse.
Out-of-warranty products will be repaired on a charge basis.
11. Return of items
Authorization must be obtained from our Customer Service Department before
returning items for any reason. When applying for authorization, please include
data regarding the reason the items are to be returned. For your protection, items
must be carefully packed to prevent damage in shipment and insured against possible damage or loss. We will not be responsible for damage resulting from careless or
insufficient packing. Arestocking charge will be made on all unauthorized returns.
NOTE: We reserve the right to make improvements in design, construction, and
appearance of products without notice.
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Table of Contents
1. Introduction.........................................................................................4-5
2. Components............................................................................................6
3. Getting started .......................................................................................7
3.1 Unpacking .............................................................................................................................7
3.2 Attaching the cylinder drum..............................................................................................7
4. Hygrothermograph operation...........................................................8-21
4.1 Powering your hygrothermograph................................................................................8-9
4.2 Cartridge pens ....................................................................................................................10
4.3 Setting the time...................................................................................................................11
4.4 Chart paper....................................................................................................................12-17
4.5 Calibration adjustment.................................................................................................18-19
4.6 Changing drum rotation length..................................................................................20-21
5. Installing optional axial fan.................................................................22
6. Precautions ...........................................................................................23
7. Specifications...................................................................................24-25
8. Ordering information...........................................................................26
9. Appendix 1: Readings in areas with high humidity ............................27
10. Warranty .............................................................................................28
11. Return of Items ...................................................................................28
NOTES
Write down the name and information of your OAKTON distributor here.
54
1. Introduction
Thank you for selecting an OAKTON thermohygrometer. These precision instruments are useful for monitoring temperature and relative humidity conditions over
time. They create a permanent chart recording of these measurements for your
records. Their quartz-controlled drive maintains an even drum speed even when
batteries are weak (or when the spring winding runs down).
Typical applications include general weather measurements, agriculture,
horticulture, monitoring the condition of test laboratories, humidity chambers,
computer rooms, precision machinery rooms, food storage facilities, warehouses,
museums, bank vaults, film and book storage facilities.
You have one of five available models:
Minidrum hygrothermograph
Model number: 08369-70
Special features:
• Compact size
• Records on 7-day rotation
• Protective acrylic cover locks
into place
Domed minidrum
hygrothermograph
Model number: 08369-50
Special features:
• Our most compact model
• Records on 7-day rotation
• Protective glass dome
Spring-wound, two-speed
hygrothermograph
Model number: 37250-10
Special features:
• Spring wound—
no batteries needed!
• Records on 1- or 7-day rotation
• Protective acrylic cover locks
into place
Three-speed hygrothermograph
Model number: 37250-00
Special features:
• Records on 1- or 7-, or 32-day
rotation
• Protective acrylic cover locks
into place
Long-cycle hygrothermograph
Model number: 37250-20
Special features:
• Records on 1 or 3 month rotation
• Protective acrylic cover locks
into place
Attaching the cylinder drum
NOTE: Long-cycle model 37250-20 already
has an attached cylinder drum.
1. Unscrew the hold-down nut from the
center shaft.
2. Carefully insert the cylinder drum onto
the center shaft. Make sure the cylinder
drum is completely lowered over the
center shaft.
See figure
3. Replace the hold-down nut on the top of
the center shaft.
76
3. Getting started
Unpacking
1. Remove all components from the packing material.
2. Carefully remove the acrylic or glass protective cover from the hygrothermo-
graph. If your model has a handle, turn the carrying handle to the left until it
stops, then lift up the protective cover.
3. Carefully remove the styrofoam piece located beneath the pen arm mechanism.
4. Remove the white paper that secures the humidity pen.
5. Lift the metal pen holding fitting up from the temperature pen until it is removed
from the pen guide.
6. Move the pen lift lever towards you to pull the temperature and humidity pens to
their resting position.
NOTE: Keep all original packing in case you need to transport the instrument.
2. Components
All OAKTON hygrothermographs have these same features:
3.1
3.2
1
2
1. Pen tip for temperature
2. Cylinder drum with quartz clock
3. Pen tip for humidity
4. Paper holder
5. Pen lift lever
6. Protective cover
7. Pen arms
8. Pen guide
3
4
5
6
7
8
A
A
98
4. Hygrothermograph operation
Powering your hygrothermograph
4.1
Minidrum models (08369-50 and -70):
These models require one AAbattery. The battery
compartment is located on top of the cylinder
drum. To open the battery compartment, slide the
cover of the battery compartment to the side. Make
sure that the + end of the battery is facing up.
Spring wound, 2 speed model (37250-10):
This model is spring wound (requires no batteries).
The spring winding shaft is located on top of the
cylinder drum. To wind up the unit, turn the shaft
counterclockwise until it is too stiff to move
any further. This hygrothermograph will make a
“clicking” sound while running. The drum will
maintain an even rotation speed even when the
spring is winding down.
3 speed model (37250-00):
This model requires two C batteries. The battery
compartment is located on top of the cylinder
drum. To open the battery compartment, pull the
silver knob on top of the battery compartment
away from the center of the cylinder drum. Note
polarity on the lid of the battery compartment.
This model features a battery indicator. To check
the battery, press the red check button next to the
battery compartment. Note the color of the LED
indicator:
• A green LED means the batteries are in
good condition.
• A red LED means the batteries need to
be replaced.
Long cycle model (37250-20):
This model requires one C battery. The battery
compartment is located on top of the cylinder
drum. To open the battery compartment, flip
open the lid on top of the cylinder drum. Note
polarity inside the battery compartment.
This model features a battery indicator. To check
the battery, press the red check button next to the
battery compartment. The power indicator has
green, white and red zones.
• the green zone means the battery is in
good condition.
• The white zone means the battery is low
and will have to be replaced soon.
• The red zone means the battery is very
low and should be replaced immediately.
Top of Drum
Close-up of battery indicator
Close-up of battery indicator
BATTERY
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