INSTRUCTIONS FOR USE
The Temp-Chex Digital II thermometer assembly is designed as a convenient device for monitoring
the temperature when storing a variety of products including clinical laboratory reagents, controls,
and patient specimens.
PRINCIPLE
Temp-Chex Digital II is comprised of a digital thermometer base unit and accompanying
stainless steel temperature probe. This thermometer is manufactured to meet NIST
standards
of accuracy and is certified traceable to NIST standards. Temp-Chex Digital II is accurate to
±1 °C between -50 °C and -30 °C, ±0.5 °C between -30 °C and 90 °C, ±2 °C between 90 °C and
150 °C and ±3 °C between 150 °C and 200 °C. Temp-Chex Digital II is not a NIST or DKD thermometer.
COMPONENTS
The stainless steel temperature probe comes within a pre-assembled glass vial/probe unit containing
glass beads as filler material. This glass vial/probe unit connects to the thermometer base unit
through the use of a metal cord. The base unit can be attached magnetically, with adhesive, or by
keyhole to any compatible exterior surface.
CALIBRATION STATEMENT
Prior to shipment, Temp-Chex thermometers are stored in a controlled environment. With proper
care, the thermometer should maintain its accuracy. Due to use in diverse applications and handling,
there is no precise way to predict how long calibration will be maintained. As with any thermometer,
drift is a possibility and accuracy can be affected by shock, aging, temperature and contamination
through daily use.
Periodic recalibration or verification should be scheduled by each laboratory
in accordance with its accrediting agency and/or established procedure
. At a minimum, annual
recalibration or verification from the date the thermometer is put “in use” is good lab practice. A
space is provided at the top of the Certificate of Calibration to record the “in use” date. The date
of certification listed for this thermometer is for reference use only. Please contact Streck Technical
Service at 800-843-0912 or [email protected] with any questions.
INSTRUCTIONS FOR USE
1. Unpack the thermometer base unit and the glass/vial probe unit with the connector cord.
Connect the sensor probe to the unit.
2. Open the battery cover and remove the battery strip to turn on the unit. The display will show
full segment display for about three seconds and then display current temperature and MIN/MAX
values.
3. Select the temperature unit by the [°C-°F] switch on the back of the unit. The unit is now ready
to be placed into service. Record readings once the temperature has become stable.
4. Place the glass/vial probe unit inside of the temperature-controlled area. Mount the base unit
outside of this area. To mount the Temp-Chex Digital II:
a. Prior to attachment of the base unit, determine if the wall is ferrous metal and will allow use
of the magnetic section. If so, make sure the surface is clean and free of any moisture or frost.
Place the enclosed magnet on the surface and then attach the Temp-Chex Digital II base unit.
Verify that it will hold properly before placing into service.
b. If the wall is not ferrous metal or if the surface does not provide proper magnetic attraction,
the adhesive surface of the enclosed magnets can be used. The surface should be clean and
dry. First check that the two magnetic parts adhere to each other (if incorrectly aligned,
the magnets will repel each other). Maintain proper orientation of the magnetic strip when
attaching it to the freezer, incubator, or refrigerator wall. Remove paper backing from the
second magnet, attach the adhesive side to the wall and allow a few minutes to establish the
appropriate bonding prior to attaching the magnet already affixed to the Temp-Chex Digital II
base unit. It is safest to attach the base unit to walls in such a position that a shelf can support
it. However, provided the appropriate attachment procedure has been followed, the base unit
should remain stationary.
FUNCTIONS
DISPLAY MODES
When the unit is powered on, the default display is the MIN/MAX mode.
Press the [MODE] button once to change the display to the LO/HI alarm mode.
Press the [MODE] button again to change the display to the DATE/TIME mode.
Press the [MODE] button again to change the display to the MIN/MAX mode.
SETTING DATE AND TIME
To set the date and time, press the [MODE] button to display the DATE/TIME mode.
Press the [SET] button on the back of the unit. The setting to adjust will flash. Press either the
[
↑
] or [
↓
] button on the back of the unit to change the year setting, then press [SET]. Use the [
↑
]
or [
↓
] button to change the date, then press [SET]. Use the [
↑
] or [
↓
] button to change the time,
then press [SET] to accept.
NOTE: If the date and time is changed, all the memory will be reset.
TURNING AUDIBLE LOW/HIGH ALARM ON OR OFF
NOTE: The unit will automatically record the date and time of an out of alarm limit when the Low/
High alarm is turned on. The unit will record 10 events.
In the LO/HI alarm display mode, press the Alarm (
) button to turn on or off the alarm function.
When the alarm is on, the (
) icon will be displayed. The icon will be displayed in the LO/HI alarm
and MIN/MAX display modes.
SETTING ALARM
These settings are user-defined based on the laboratory's criteria for the controlled environment.
To set the Low/High alarm, press the [MODE] button to display the LO/HI Alarm mode.
Press the [SET] button on the back of the unit.
Enter the low alarm temperature setting by pressing the [
↑
] or [
↓
] button on the back of the unit,
then press [SET].
Enter the high alarm temperature setting by pressing the [
↑
] or [
↓
] button on the back of the unit,
then press [SET].
When the temperature reading exceeds the user-defined low or high alarm values, the alarm will
sound, the LO ALM or HI ALM icon will flash and the LED in the upper right hand corner of the unit
will flash. The alarm will sound for one minute. After that time, the sound will be two beeps every
one minute to preserve battery life. The audible alarm will stop when the temperature returns to
within the alarm limits but the LED will continue to flash until the memory is cleared.
MIN/MAX TEMPERATURE
In the MIN/MAX display mode, the display will read the current temperature and the MIN/MAX
temperature memory.
Press the [EVENT] button to read the MAX temperature and the date and time of the reading.
Press the [EVENT] button to read the MIN temperature and the date and time of the reading.
Press the [EVENT] button again to return to the MIN/MAX display mode.
To clear the MIN/MAX memory, press the [CLEAR] button to permanently delete all MIN/MAX
events in memory.
LOW/HIGH ALARM DATE/TIME STAMP
In the LO/HI alarm display mode, press the [EVENT] button to read the LO/HI alarm generated with
its associated date/time stamp.
A number on the top left corner of the screen will indicate the number of events recorded. A zero will
display with all dashes if no events have been recorded.
Press either the [
↑
] or [
↓
] button on the back of the unit to scroll through the date/time stamped
events.
Press the [EVENT] button to exit the reading mode.
To clear the LO/HI memory, scroll through the Date/Time stamped events and press the [CLEAR]
button to permanently delete all LO/HI events in memory.
LIMITATIONS:
• Do not remove probe from unit. If probe is disconnected, the alarm will sound and a red light will
flash. Reconnect the probe, wait for the audible beep to stop, then press the Alarm ( ) button
to turn the alarm off. Flashing will stop. Press the Alarm button to enable the audible alarm and
continue using the unit.
• The base unit should not be exposed to extreme temperatures.
• Avoid transferring probe unit directly from one extreme temperature environment to another
(e.g., freezer to oven); instead, allow unit to slowly adjust to room temperature first.
• Do not immerse glass vial/probe unit in liquid (e.g., water baths).
• If probe insertion within the glass vial/probe unit becomes offset relative to its original position,
adjust insertion such that approximately 1
3
⁄
16
inch (30 mm) of the probe extends above the top
surface of the vial.
• If the thermometer is placed outside of the range of designed use, the display may read the
following: "LLL" when used below -50 °C, "HHH" when used above 200 °C.
• If using the thermometer within the range of designed use and the display reads “LLL” or “HHH”,
make sure the probe is inserted correctly.
BATTERY
The battery life for this unit is typically one year. Replace the AAA batteries if:
• The Low Battery Voltage symbol appears in the upper right hand corner.
• There is no display (the battery may be discharged).
• Readings are inconsistent.
SPECIFICATIONS
Measurement Range:
-50 °C to 200 °C / -58 °C to 392 °F
Accuracy:
±1.0 °C between -50 °C and -30 °C.
±0.5 °C between -30 °C and 90 °C.
±2.0 °C between 90 °C and 150 °C.
±3.0 °C between 150 °C and 200 °C.
Display resolution:
0.1 °C
Sampling rate:
1.0 second
Battery: 1.5V
AAA
Display size:
37 mm (W) x 37 mm (H)
Probe size:
65 mm (L)
Probe cord length:
1524 mm
Product size:
65 mm (W) x 97 mm (H) x 20 mm (D)
Product weight:
130 g
ORDERING INFORMATION
Please call our Customer Service department at 800-228-6090 for assistance. Additional information
can be found online at www.streck.com.
INTERNET CERTIFICATE OF CALIBRATION DIRECTIONS
A translated, generic Certificate of Calibration can be obtained at www.streck.com using the Temp-
Chex Digital II product page, by calling 800-843-0912 or by calling your local supplier.
GLOSSARY OF SYMBOLS
See the Instructions (IFU) tab under Resources on the product page at www.streck.com.
See www.streck.com/patents for patents that may be applicable to this product.
Temp-Chex Digital II
350646-1
2018-07
Streck
7002 S. 109 Street, La Vista, NE 68128 USA
