OAKTON 37250-00, 08369-50, 37250-10, 37250-20, 08369-70 Instruction Manual

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. A restocking 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.

OPERATING INSTRUCTIONS

OAKTON® Models 08369-50, -70

37250-00, -10, -20

Hygrothermographs

00703-07

Printed in the U.S.A. 1/00

NOTES		Table of Contents
Write down the name and information of your OAKTON distributor here.		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

2

3

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

4

5

2. Components

All OAKTON hygrothermographs have these same features:

	6
2	7
3
4	8
5

1.	Pen tip for temperature	6.	Protective cover
2. Cylinder drum with quartz clock		7.	Pen arms
3.	Pen tip for humidity	8. Pen guide

4.Paper holder

5.Pen lift lever

3.Getting started

3.1Unpacking

1.Remove all components from the packing material.

2.Carefully remove the acrylic or glass protective cover from the hygrothermograph. 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.

3.2 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 A

3. Replace	hold-down nut on the top of
the	shaft.

A

6

7

4.Hygrothermograph operation

4.1Powering your hygrothermograph

Minidrum models (08369-50 and -70):

These models require one AA battery. 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.

Top of Drum

Close-up of battery indicator

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.

Close-up of battery indicator

BATTERY

8

9