Oakton Acorn TEMP 4 User manual

DISTRIBUTED BY:
00702-81
OPERATING INSTRUCTIONS
OAKTON WD-35626-00, -10, -20
TEMP 4, TEMP 5 and TEMP 6
Acorn Series Meters
Printed in the U.S.A. 6/99
TEMP 5
Acorn series
Thermistor
Thermometer
ON
OFF
CAL HOLD
ENTER
°C/°F
MAX MIN
9. Warranty
OAKTON warrants this meter to be free from significant deviations in material and
workmanship for a period of one year from date of purchase. OAKTON warrants
this probe to be free from significant deviations in material and workmanship for a
period of six months 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.
10. Return of items
Authorization must be obtained from your OAKTON distributor before returning
items for any reason. When applying for authorization, please include data regard-
ing the reason the items are to be returned. For your protection, items must be care-
fully 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.

32
Table of Contents
1. Introduction ............................................................................................4
2. Display and keypad functions.................................................................5
3. Preparation...........................................................................................6-7
3.1 Inserting the batteries.....................................................................................................................6
3.2 Connecting the temperature sensor.............................................................................................6
3.3 Switching the meter on..................................................................................................................7
4. Measurement........................................................................................8-9
4.1 Measuring temperature..................................................................................................................8
4.2 Displaying minimum and maximum temperature...................................................................8
4.3 HOLD function................................................................................................................................9
4.4 Minimum and maximum hold mode..........................................................................................9
5. Calibration........................................................................................10-11
5.1 Temperature calibration using offset adjustment ....................................................................10
5.2 Temperature curve selection (TEMP 5 only).............................................................................11
6. Troubleshooting ....................................................................................12
7. Specifications.........................................................................................13
8. Accessories.............................................................................................14
9. Warranty................................................................................................16
10. Return of items ...................................................................................16

54
1. Introduction
Thank you for purchasing an OAKTON®TEMP Acorn Meter. These economical,
microprocessor-based meters are available in three models:
• the Acorn TEMP 4 uses a series 400 thermistor temperature sensor
• the Acorn TEMP 5 uses a 100K thermistor temperature sensor
• the Acorn TEMP 6 uses a PT 100 RTD temperature sensor
All Acorn TEMP meters feature:
• Large LCD for clear and easy reading
• Readings in °C and °F (switchable)
• Minimum and maximum temperature display
• Minimum and maximum hold mode
• Low battery indicator
• Hold function, freezes measured reading
• User calibration, offset adjustment
• Built-in memory backup; calibration and other information remain
if battery is disconnected
• TEMP 5 thermistor sensor allows selection of most suitable
temperature curve
This instruction manual is organized for easy reference. For basic functions of this
meter, read sections 2 through 5. These sections include basic instructions that will
get you up and running quickly. The remaining sections of this manual (6 through
11) deal with error messages and troubleshooting. This part of the manual also
includes the Specifications, Accessories, Warranty and Return of Items section.
2. Display and Keypad Functions
The Acorn has a large custom LCD with the following indicators:
°C
HO LO °F
MAX
MIN
Degree C
annunciator
Degree F
annunciator
minimum
Reading
indicates
HOLD
function is
activated
indicates low
battery condition maximum
The OAKTON Acorn meter has six keys on its splashproof keypad. These keys are
ON/OFF, CAL, HOLD/ENTER, MAX/▼(DOWN), MIN/▲(UP) and °C/°F.
ON/OFF: Powers meter on and shuts
unit off. Meter directly enters
measurement mode when you
turn it on.
CAL: Allows temperature calibration
of the meter.
HOLD/ENTER: Freezes the measured
reading; confirms calibration value.
MAX/▲(UP) and MIN/▼(DOWN):
momentarily displays maximum
or minimum temperature;
enter maximum or minimum
hold mode; scroll up and down
in calibration mode.
°C/°F: Switches between °C and °F
in measurement mode.
ON
OFF
CAL HOLD
ENTER
°C/°F
MAX MIN

3. Preparation
Inserting the batteries
The battery compartment is found at the
back of the instrument. To open the
battery compartment, push the lid up.
See figure
Note the polarity of battery before insert-
ing the batteries into position. After
replacement, place the cover back into
its position and press down until it
locks tight.
A "LO" annunciator in the LCD alerts
you when battery power is running
low. Replace batteries with a fresh set
as soon as possible.
Connecting your
Temperature sensor
Insert the phono jack of the temperature sensor into the socket on the meter.
Unplug the phono jack when not in use.
76
3.1
A
A
temperature probe connections at top of Acorn meter
3.2
Switching the meter on
Press the ON/OFF key to power up your meter. All
the LCD segments display for a few seconds as the
meter goes through a self-diagnostic test. The LCD
then switches into measurement mode.
If the LCD then displays "oPEn", the temperature
sensor is faulty, or there is an open circuit.
See figure
See page 12 for more troubleshooting information.
3.3
A
A

98
4. Measurement
Measuring Temperature
1. Switch on meter. The Acorn TEMP meter will
automatically enter the temperature measure-
ment mode. The °C or °F annunicator will
display in your LCD to indicate which mode
you are taking measurements in.
See figure
2. Press the °C/°F key to switch between measurement modes.
Displaying Minimum and Maximum Temperature
The Acorn TEMP meters can momentarily display
the minimum and maximum temperature
measured since you switched the meter on.
Simply press MAX/▲or MIN/▼key. The MIN
or MAX annuciator will display in the LCD,
and the minimum or maximum temperature
will temporarily display.
See figure
Meter will then return to measurement mode.
4.1
Hold function
To freeze your reading, press the HOLD key
once. The LCD show "HO" to indicate the
HOLD function is activated
See figure
Press HOLD key again to deactivate the HOLD
function and return to measurement mode.
Minimum and Maximum Hold Mode
With Minimum and Maximum Hold Mode, the Acorn TEMP meter can be used
as a maximum registering (or minimum registering) thermometer. The meter will
display the lowest or highest temperature
measured since entering the Maximum or
Minimum Hold mode.
1. Switch on meter. The Acorn TEMP meter
will automatically enter the temperature
measurement mode. Use °C/°F to switch
between Celsius and Fahrenheit readings
if desired.
2. Press the HOLD key. The reading will
freeze and the annuciator “HO” will
display in the LCD.
3. Press the MAX/▲or MIN/▼key. Meter enters the Maximum or Minimum
Hold mode. “HO” and “MAX” or “MIN” annuciators display in the LCD.
See figure
Meter will now continuously display the lowest or highest temperature measured
since you entered this mode. It will update the display when new highs or
lows are reached.
Press HOLD key again to leave MIN/MAX Hold mode and return to standard
measurement mode.
HO °F
A
A
A
4.3
4.4
4.2
°C
A
°C
MAX
A
A
A
HO °F
MIN
A

Temperature curve selection (TEMP 5 meter only)
Using the offset temperature calibration procedure
you can achieve the ±0.2°C/±0.4°F accuracy
specified for this meter. In the event the probe is
replaced, or due to drastic changes in the thermistor
characteristics, you may want to select the most
suitable curve for that probe, and therefore do an
offset adjustment for the selected curve.
1. Connect your temperature probe to the
meter. Turn meter on. Meter enters
measurement mode.
2. Compare displayed value to a NIST certified
thermometer or other thermometer known to
be accurate. For best accuracy, place probe and
thermometer in a constant temperature bath, in
this example: 25°C.
3. Press the CAL key to enter calibration mode.
The LCD shows "CA" and the reading flashes.
See figures
4. Press °C/°F key to enter curve selection mode.
Press the °C/°F key again to scroll through the
three temperature curves (low, mid, high).
Find the temperature reading closest to
your actual temperature, in this example:
24.9°C.
See figure
6. Press ENTER key to confirm calibration.
The LCD flashes "CO", the meter then
reverts to temperature calibration mode
and the display continues to flash.
See figures
7. Use the ▲and ▼keys to fine tune the
temperature reading to your actual
temperature, in this example: 25°C.
8. Press ENTER key to confirm calibration.
The LCD displays "CO", and the meter
then reverts to measurement mode.
1110
5. Calibration
Temperature calibration using offset adjustment
The temperature sensor included with your meter is factory calibrated. Over time,
the temperature calibration may drift and require recalibration. If you replace the
probe you should recalibrate.
1. Connect your temperature probe to the meter. Turn meter on. Meter enters
measurement mode.
2. Compare displayed value to a NIST certified thermometer or other thermometer
known to be accurate. For best accuracy, place probe and thermometer in a con-
stant temperature bath.
3. Press the CAL key to enter calibration mode.
The LCD shows "CA" and the reading flashes.
See figures
5. Use the ▲and ▼keys to adjust the
temperature shown to match the accurate
temperature (maximum adjustment is
±5°C from factory default).
6. Press ENTER key to confirm calibration.
The LCD displays "CO", and the meter
then reverts to measurement mode.
5.1
5.2
A B
B
A
E
D
°C
C
C
°C
A
B
°C
A
B
°C
D
E

1312
6. Troubleshooting
Problem Cause Solution
“Ur” or “Or” Measurement over (Or) or —
on LCD Under (Ur) range.
Bad temperature Change temperature
probe probe
oPEn annuciator Probe not connected Make sure probe
on LCD is firmly connected
LO annuciator Low battery Replace batteries
on LCD with fresh set
Power on but Batteries not Insert batteries
no display in place
Batteries not in Re-insert batteries
correct polarity (+ and -) with correct polarity
Weak batteries Replace batteries
Unstable Probe not deep Place probe
reading enough in sample deeper in sample
Broken probe Replace probe
External “noises” or Remove or switch off
induction caused by interfering motor
by nearby electric motor
Dirty probe Clean probe
Slow response Dirty probe Clean probe
7. Specifications
Model TEMP 4 and 5 (Thermistor) TEMP 6 (RTD)
Range -40.0 to 125.0°C -50.0 to 150.0°C
-40.0 to 257°F -58.0 to 302°F
Resolution 0.1°C/0.1°F 0.1°C/0.1°F
Accuracy ±0.2°C/0.4°F ±0.2°C /0.4°F
Input connector: Temp 4 and Temp 5: 6.3 mm phono jack
Temp 6: 3 pin mini connector
Display: Single line LCD
Auto shutoff: after 17 minutes
Hold Function indicator: HO
Error Message display: Err
Low battery indication: LO
Operating temperature: 0 to 50°C
Power: 4 x AAA Alkaline batteries (>200 hours)
Dimensions: Meter only: 5.5" x 2.7" x 1.3" (14 x 7 x 3.5 cm);
Boxed: 9.25" x 6.5" x 3" (23.5 x 16.5 x 7.6 cm)
Weight: Meter only: 0.5 lb (210 g); Boxed: 1 lb (420 g)

1514
8. Accessories
WD-35626-00 Acorn TEMP 4 Thermistor Thermometer for use with Series 400
probes. Probe not included. Shpg wt. 1 lb (460 g).
WD-35626-10 Acorn TEMP 5 Thermistor Thermometer with temperature probe.
Shpg wt. 1 lb (460 g).
WD-35626-20 Acorn TEMP 6 RTD Thermometer with temperature probe.
Shpg wt. 1 lb (460 g).
WD-35626-50 Replacement probe for TEMP 5 meter
WD-35626-60 Replacement probe for TEMP 6 meter
WD-35606-80 Protective Rubber Boot, encases meter in sturdy rubber to protect it
from drops and dings. Also features meter stand for convenient tabletop use.
Shpg wt 0.5 lb (230 g).