Nova-Tech 4238, 4239, 4240 User Manual
S
PECIFICATIONS
Range: -58.00 to 158.00 °F
-50.00 to 70.00 °C
Accuracy: ±0.3 °C
Resolution: 0.01°
Update Rate: 1 second (FAST)
10 seconds (NORMAL)
Battery: 2 each AAA (1.5V)
Probes Supplied:
Model 4238-- Supplied with 1 bottle probe. Designed
for use in refrigerators and freezers, bottle probes are
lled with a patented nontoxic glycol solution that is
GRAS (Generally Recognized As Safe) by the FDA
(Food and Drug Administration) eliminating concerns
about incidental contact with food or drinking water.
The solution lled bottle simulates the temperature
of other stored liquids. Velcro
®
and a magnetic strip
are provided to mount the bottle to the inside of a
refrigerator/freezer. The micro-thin probe cable permits
refrigerator/freezer doors to close on it. (Do not
immerse bottle probes in liquid).
Model 4239-- Supplied with dual bottle probes. (Do not
immerse bottle probes in liquid)
Model 4240-- Supplied with dual standard probes with
cables. Designed for use in air and liquids, the sensor
and cable may be completely immersed.
SETTING THE TIME-OF-DAY/DATE
Slide the DISPLAY switch to the DATE TIME position, the
display will show the time-of-day and date.
While in the time-of-day/date display, pressing the
SELECT button will allow the date and time to be set.
Pressing the SELECT button will cause the digits to ash
in the following order Year→Month→Day→Hours→
Minutes →12/24 hour time→No digits ashing (value
set). Once the desired item is ashing, pressing the
ADVANCE button will increment the value.
While in the time-of-day/date display, pressing the
EVENT DATE TIME button will switch the date display
between Month/Day (M/D) and Day/Month (D/M).
With the desired time-of-day/date appearing on the display,
press the SELECT button until no digits are ashing on the
display. The time-of-day/date will be saved.
Note: While in the setting mode, if no button is pressed
for fteen (15) seconds, the unit automatically exits from
the setting mode.
VIEWING THE TIME-OF-DAY/DATE
To view the time-of-day/date, slide the DISPLAY switch to
the DATE TIME position.
DISPLAYING °F OR °C
To display the temperature readings in Fahrenheit or
Celsius, slide the °C/°F button to the desired position.
DISPLAYING PROBE 1 OR PROBE 2
Slide the PROBE switch to the desired position (1 or 2) to
display the desired temperature sensor readings.
MINIMUM AND MAXIMUM MEMORY
There are four points that are automatically recorded into
memory:
Minimum (MIN) Probe 1 (P1) Temperature
•
Achieved with time-of-day and date achieved
• Maximum (MAX) Probe 1 (P1) Temperature
Achieved with time-of-day and date achieved
• Minimum (MIN) Probe 2 (P2) Temperature
Achieved with time-of-day and date achieved
• Maximum (MAX) Probe 2 (P2) Temperature
Achieved with time-of-day and date achieved
Minimum and maximum temperature memories
are NOT programmable. The minimum temperature
recorded into memory is the minimum temperature
achieved since the last time the memory was cleared.
The maximum temperature recorded into memory is
the maximum temperature achieved since the last time
the memory was cleared. The minimum and maximum
temperature memories are maintained over the period
since the memory was cleared.
Minimum and maximum memories are recorded for both
sensors regardless of the display mode.
VIEWING MIN/MAX MEMORY
1. Slide the PROBE switch to the desired position (1 or
2) to display the desired temperature sensor readings.
2. Slide the DISPLAY switch to the MIN MAX position.
The display will show the current temperature and
minimum/maximum memory for the selected probe.
VIEWING MIN/MAX MEMORY DATE/TIME
1. Slide the PROBE switch to the desired position (1 or
2) to display the desired temperature sensor readings.
2. Slide the DISPLAY switch to the MIN MAX position.
The display will show the current temperature and
minimum/maximum memory for the selected probe.
3. Press the EVENT DATE TIME button, the minimum
temperature achieved by that probe along with the
time-of-day/date the temperature was achieved will
appear on the display (indicated by MIN and TIME
appearing on the display).
4. Press the EVENT DATE TIME button a second time,
the maximum temperature achieved by that probe
along with the time-of-day/date the temperature was
achieved will appear on the display (indicated by
MAX and TIME appearing on the display).
Note: If no button is pressed for fteen (15) seconds,
the unit automatically returns to the current temperature
display mode.
5.
To exit from the memory display mode, press and
release the EVENT DATE TIME button until MIN or
MAX no longer appears on the display, or simply do
not press any button for fteen (15) seconds.
CLEARING THE MINIMUM/MAXIMUM MEMORY
Slide the PROBE switch to the desired position (1 or
1.
2) to display the desired temperature sensor readings.
2. Slide the DISPLAY switch to the MIN MAX position.
The display will show the current temperature and
minimum/maximum memory for the selected probe.
3. Press the CLEAR MIN MAX button to clear the
minimum and maximum memories for the probe
being displayed.
ALARMS
Both temperature sensor (P1/P2) alarm limits may be set
in 0.1° increments. Probe 1 and Probe 2 alarm limits are
set independent of each other.
With the alarm switch set to the ON position:
-The unit will sound an alarm and ash the corresponding
LED (P1/P2) when the temperature measured is outside
the alarm limits that have been set (equal to or lower than
the low alarm set point, or equal to or greater than the
high alarm set point).
-The alarm will sound regardless of which sensor is being
displayed and regardless of the display mode. Example:
If Probe 1 is being displayed and the DISPLAY switch is
set to MIN MAX, but Probe 2 reaches an alarm condition,
the alarm will sound and the P2 LED will ash.
SETTING THE TEMPERATURE ALARM LIMITS
1. Slide the PROBE switch to the desired position (1 or
2) to display the desired temperature sensor readings.
2. Slide the DISPLAY switch to the ALARM position.
The display will show the current temperature and
low/high alarm set points for the selected probe.
3. While in the alarm display mode, pressing the SELECT
button will allow the alarm limits to be set.
Pressing the SELECT button will cause the digits to
ash in the following order: Low Alarm 1st Digits→Low
Alarm 2nd Digit→Low Alarm Decimal Digit→ High Alarm
1st Digits→High Alarm 2nd Digit→High Alarm Decimal
Digit→No digits ashing (value set).
4. Once the desired item is ashing, pressing the
ADVANCE button will increment the value.
5. With the desired alarm set points appearing on the
display, press the SELECT button until no digits
are ashing on the display. The alarm settings will
be saved.
Note: While in the setting mode, if no button is pressed
for fteen (15) seconds, the unit automatically exits from
the setting mode.
VIEWING THE TEMPERATURE ALARM LIMITS
1. Slide the PROBE switch to the desired position (1 or
2) to display the desired temperature sensor readings.
2. Slide the DISPLAY switch to the ALARM position.
The display will show the current temperature and
low/high alarm set points for the selected probe.
ENABLE/DISABLE ALARMS
To enable the alarm to activate when a temperature
measured is outside the alarm limits, slide the ALARM
switch to the ON position.
When the alarm is enabled, both Probe 1 and Probe 2
alarm set points will be monitored. If either sensor reaches
an alarm condition, the alarm will activate. It is not possible
to enable the alarm for one sensor and disable the alarm
for the other sensor.
To disable the alarm so that no alarm sounds when a
temperature measured is outside the alarm limits, slide
the ALARM switch to the OFF position.
A
LARM SOUNDING
With the alarm enabled, the unit will sound an alarm and
the corresponding (P1/P2) red LED will ash when a
temperature being measured is outside the alarm limits
that have been set (equal to or lower than the low alarm
set point, or equal to or greater than the high alarm set
point). Until it has been acknowledged/silenced (see
the “Acknowledge/Silence An Alarm” section), the alarm
will sound and corresponding (P1/P2) red LED will ash
continuously for the rst sixty (60) seconds. After 60
seconds, the alarm will sound and LED will ash for ten
(10) seconds every minute.
If the alarm is sounding based on the low alarm limit and
the probe temperature is being displayed, “LO ALM” will
also ash on the display. If the alarm is sounding based
on the high alarm limit and the probe temperature is
being displayed, “HI ALM” will ash on the display.
The alarm will sound and corresponding LED will ash
regardless of which sensor is being displayed and
regardless of the display mode. Example: If Probe 1 is
being displayed and the DISPLAY switch is set to MIN
MAX, but Probe 2 reaches an alarm condition, the alarm
will sound and the P2 LED will ash.
The unit will continue to alarm and ash the corresponding
(P1/P2) red LED until the alarm has been acknowledged/
silenced by either pressing the SILENCE ALM button or
by sliding the ALARM switch to the OFF position (see the
“Acknowledge/Silence An Alarm” section). The unit will
continue to alarm and ash the corresponding (P1/P2) red
LED even if the temperature being measured returns to an
in-range/non-alarm condition.
ACKNOWLEDGE/SILENCE AN ALARM
While alarming, the alarm may be acknowledged/silenced
in one of the following ways:
1. Slide the ALARM switch to the OFF position.
Setting the ALARM switch to the OFF position will
silence the alarm, but when it is switched back to the
ON position, if the temperature being measured is
still in an alarm condition, the alarm will sound.
Setting the ALARM switch to the OFF position
prevents any/all alarms from sounding.
2. Press the SILENCE ALM button. Pressing the
SILENCE ALM button will silence the alarm, the alarm
will not sound again until the temperature being
measured has returned to an in-range condition and
then goes to an alarm condition.
VIEWING ALARM EVENT VALUE DATE & TIME
When the thermometer achieves and alarm condition,
the date and time for the most recent alarm condition
is stored into memory. The most recent alarm event
achieved is stored for each probe (P1/P2) independently.
To view the most recent alarm event:
Slide the PROBE switch to the desired position (1 or
1.
2) to display the desired temperature sensor readings.
2. Slide the DISPLAY switch to the ALARM position.
The display will show the current temperature and
the low/high alarm set value.
3. Press the EVENT DATE TIME button, the most recent
alarm set value that was achieved along with the
time-of-day/date the alarm occurred will appear on
the display.
Note: The value that appears at the top of the display
while displaying the event date/time, is the alarm set
value that caused the alarm condition, not the actual
temperature achieved while in the alarm condition. If
nothing appears on the display when the EVENT DATE
TIME button is pressed, this indicates that either the unit
has not achieved an alarm condition, or that the alarm set
values have been changed for the selected probe since
the unit last achieved an alarm condition.
4.
To exit from the alarm event display mode, press and
release the EVENT DATE TIME button, or simply do
not press any button for fteen (15) seconds.
DISPLAY MESSAGES
LL.LL appearing on the display indicates that the
temperature being measured is outside of the
temperature range of the unit, or that the probe is
disconnected or damaged.
BENCH STAND
The unit is supplied with a bench stand that is a part
of the back of the unit. To use the bench stand, locate
the small opening at the bottom back of the unit. Place
your ngernail into the opening and ip the stand out.
To close the stand, simply snap it shut.
EXAMPLE - USING THE ALARM AND MEMORY TO
MONITOR A REFRIGERATOR/FREEZER
Following is a simple example of how to use the alarm
and memory to monitor the temperature inside a
refrigerator or freezer. This example is provided only as a
helpful guide and is not intended to replace existing facility
requirements or procedures.
In this example, the refrigerator temperature must be
monitored and logged for each 24 hour period and certain
actions must be taken if temperature falls below 0°C or
rises above 5°C at any time during the 24 hour period.
Unit Setup Example
Plug the probes into the unit.
1.
2. Install the batteries.
3. Place the probe sensor inside the refrigerator.
4. Place the display outside the refrigerator.
5. Select the desired probe.
(See the “Displaying Probe 1 or Probe 2” section.)
At this point, if using a bottle probe, allow sufcient time
for the bottle probe to reach equilibrium with the true
current temperature inside the refrigerator.
6. Set the probe temperature low alarm limit to 0°C.
(See the “Setting The Temperature Alarm Limits”
section.)
7. Set the probe temperature high alarm limit to 5°C.
(See the “Setting The Temperature Alarm Limits”
section.)
8. Enable the alarms.
(See the “Enable/Disable Alarms” section.)
9. Clear the minimum and maximum memory.
(See the “Clearing the Minimum/Maximum Memory”
section.)
10. Slide the DISPLAY switch to the MIN MAX position.
(See the “Viewing Min/Max Memory” section.)
The alarm limits have been set and the alarm has been
enabled. The display has been set to show the current
temperature inside the refrigerator along with the minimum
and maximum temperature that has been achieved inside
the refrigerator.
If the temperature inside the refrigerator goes outside
the alarm limits (equal to or lower than the low alarm
set point, or equal to or greater than the high alarm set
point), the alarm will activate. The memory will provide
a record of the single lowest and highest temperature
achieved.
Monitoring Procedure Example
Keep a notebook or spreadsheet as a manual log.
1. At the same time every day, record the following
into the manual log:
• Current Date and Time
• Current Temperature Reading
• Minimum Temperature Reading (MIN)
• Maximum Temperature Reading (MAX)
2. Once the above items have been manually recorded,
clear the temperature memory. (See the “Clearing
the Minimum/Maximum Memory” section.)
By clearing the memory each day, the minimum and
maximum temperature memory will provide a record of
the minimum and maximum temperature that has been
achieved inside the refrigerator over the past 24 hour
monitoring period. In addition to the alarm, the memory
will also allow the user to see if the temperature inside the
refrigerator went outside of the acceptable range.
A
LL OPERATIONAL DIFFICULTIES
If this unit does not function properly for any reason,
replace the batteries with new high-quality batteries
(see the “Battery Replacement” section). Low battery
power can occasionally cause any number of “apparent”
operational difculties. Replacing the batteries with new
fresh batteries will solve most difculties.
BATTERY REPLACEMENT
Erratic readings, a faint display, no display, or a
battery symbol appearing on the display are all
indications that the batteries must be replaced.
Remove the battery cover, located on the back of the
unit, by sliding it down. Remove the exhausted batteries
and replace them with two (2) new AAA alkaline batteries.
Make certain to insert the new batteries with the proper
polarity as indicated by the illustration in the battery
compartment. Replace the battery cover.
Replacing the batteries will clear the minimum/maximum
memories, the high/low alarm settings, and the time-ofday/date.
WARRANTY, SERVICE, OR RECALIBRATION
For warranty, service, or recalibration, contact:
CONTROL COMPANY
Ph. 281 482-1714 • Fax 281 482-9448
E-mail sales@control3.com • www.control3.com
Control Company is ISO 9001 Quality-Certied by DNV and ISO
17025 accredited as a Calibration Laboratory by A2LA.
4455 Rex Road
Friendswood, Texas 77546 USA
TRACEABLE
HIGH
ACCURACY
REFRIGERATOR
THERMOMETER
INSTRUCTIONS
Control Company Cat. No. 4238 / 4239 / 4240
Traceable® is a registered trademark of Control Company.
2010 Control Company. 92-4238-00 Rev. 2 013111
©
®
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