Digi-Sense 91428-03 User manual

Instruction Manual
Dual-Input J/K/T/E Thermocouple
Thermometer (Model 91428-03)
Dual-Input Data Logging
Thermocouple Thermometer
(Model 91428-04)
68X001352 Rev0 0717 1065DGMAN_91428-03,-04

T
A BLE OF CONTENTS
1. INTRODUCTION.....................................1
2. SAFETY PRECAUTIONS ........................2
3. SPECIFICATIONS..................................3
4. BATTERY INSTALLATION ......................6
5. OPTIONALRUBBER ARMOR..................7
6. OPTIONAL HANDS-FREE KIT ..................8
7. CONNECTING ATHERMOCOUPLE........9
8. KEYFUNCTIONS.................................11
9. DISPLAY OVERVIEW ........................... 12
10. MEASUREMENT MODE........................ 13
11. HOLDFUNCTON..................................14
12. MIN, MAX, AND AVGFUNCTION............14
13. DATA LOGGING...................................14
14. SETUP MODE ......................................15
15. GENERAL SETUP SCREEN ................. 16
16. CALIBRATION SCREEN ........................ 18
17. ALARMS SCREEN ................................ 21
18. DATA LOGGING SCREEN.................... 22
19. CALIBRATION REPORT SCREEN .........23
20. CLEAR /RESET SCREEN..................... 24
21. MAINTENANCE ....................................25
22. CLEANING ........................................... 25
23. BATTERIES ..........................................25
24. TROUBLESHOOTING........................... 26
25. ACCESSORIES ....................................27
26. WARRANTY ......................................... 28
27. PRODUCT RETURN ............................. 28
28. INNOCAL®CALIBRATIONAND
REPAIRSERVICES.............................. 29

- 1 -
INTRODUCTION
This versatile handheld
instrument provides highly
accurate temperature
measurements. The
instrument is designed
for easy operation and
includes the following
features:
•Menu driven setup and operation
•Data logging for up to 1000 points
on model 91428-03, 2000 points
on model 91428-04
•USB output (model 91428-04 only)
•Differential temperature
measurements
•Operator selection of Celsius or
Fahrenheit scale
•Resolution of 0.1°C/F from
–199.9 to 999.9°
•Large backlit LCD with two lines
of four-digit display
•Hold feature for temporarily retain
a reading
•Displays min and max readings
•Field calibration capability
•Disabling of Auto-Off function
•Low-battery warning
•Two blade female ANSI mini-
connector input
•Operates with a wide selection of
probes

- 2 -
SAFETY PRECAUTIONS
WARNING:
1. This instrument is designed to
accept low level signals supplied
by standard Thermocouples. Under
NO circumstances should the input
voltage exceed the specified
50V RMS.
2. To prevent ignition of a hazardous
atmosphere, batteries must only be
changed in an area known to be
nonhazardous.
CAUTION:
1. Do not use or store this instrument in
microwave ovens or any abnormally
hot or cold areas.
2. Weak batteries should not be left in
the instrument. Dead batteries can
leak and cause damage to unit.
DANGER:
1. Voltages present at the
thermocouple may also be present
at the battery terminals. Always
disconnect the thermocouple when
changing batteries.

- 3 -
SPECIFICATIONS
Thermocouple Thermometers
Type
Temperature range
Type J
–210°C to 1200°C
(–346°F to 2192°F)
Type K
–250°C to 1372°C
(–418°F to 2501°F)
Type T
–250°C to 400°C
(–418°F to 752°F)
Type E
–250°C to 1000°C
(–418°F to1832°)
Type R (model
91428-04 only)
0°C to 1768°C
(32°F to 3214°F)
Type S (model
91428-04 only)
0°C to 1768°C
(32°F to 3214°F)
Type N (model
91428-04 only)
–250°C to 1300°C
(–418°F to 2372°F)
Type B (model
91428-04 only)
200°C to 1800°C
(392°F to 3272°F)
Out-of- ra nge displa y : - - - -
Reso lution:
0.1°/1° auto-ranging,
0.1°C/F from –199.9 to 999.9°,
1° outside this range

- 4 -
Accuracy:
Types J, K, T, E, and N:
Below –150°C (–238°F):
±0.25% of reading ±1°C (±0.25% ±0.7°F)
Above –150°C (–238°F):
±0.1% of reading ±0.4°C (±1% ±0.7°F)
Types R, S, and B:
±0.1% of reading ±1°C (±0.1% ±2°F)
Displa y:
Backlit dot matrix, 50mm x 37.2mm
Data logging:
Model 91428-03: 1000 points
Model 91428-04: 2000 points
Logging interval:
1 sec to 60 min
Min/Max/Avg function:
Yes
Auto Off (adjustable time):
Enable/disable option available
Stability criteria:
Yes, upon stability of 5 seconds
Display upda te rate:
0.6 sec per up date
Inpu t:
Two thermocouples with ANSI connector

- 5 -
Inpu t prote ct ion:
50V rms
Storage:
–40°C to 65°C (–40°F to 149°F)
Humidity:
10% to 90% RH (noncondensing)
Battery life:
Size: Three AA, 1.5V; alkaline
Life: 400 hours continuous, typical,
(without backlighting)
Dimensions:
Without armor:
175mm (L) X 97mm (W) X 42mm (H)
With armor:
180mm (L) X 102mm (W) X 52mm (H)
Weight with batteries:
Without armor: 267g
With armor: 362g
Ingress protection:
Meets IEC-529 IP-54 for dust and water
resistant enclosures (probe attached)
CE Compliance:
EN61326-1/A1: 1998 (EU EMC Directive)

- 6 -
BATTERY INSTALLATION
The total battery life without backlighting
and alarm is about 400 hours. The
battery bar annunciator represents the
battery strength. An empty battery
annunciator indicates low battery
strength; a blinking battery annunciator
indicates that the batteries should be
replaced immediately.
Selected settings are stored in memory
and will remain in memory even after
power is turned off, or while batteries
are being replaced.
1. Before changing battery, turn
instrument off and disconnect
thermocouple.
2. Loosen screw and lift battery cover
off back of case.
3. Remove the three AA batteries.
4. Insert three new batteries
observing polarity.
5. Install cover and tighten screw.

- 7 -
RUBBER ARMOR
1. To insert thermometer into the
optional rubber armor, slide in from
the top of meter before pushing the
bottom edges of meter down to set
it into position. Lift up the stand at
the back of meter for bench top
applications if necessary.
2. To remove thermometer from armor,
push out from the bottom edges of
meter until it is completely out of boot.

- 8 -
OPTIONAL HANDS-FREE KIT
You can use the optional magnets and
strap in the Hands-Free Kit accessories
for convenient hands-free operations.

- 9 -
CONNECTING A THERMOCOUPLE
Use the correct thermocouple type for
your instrument setting. Using an
incorrect thermocouple type will result in
erroneous readings. Thermocouples are
colour coded by type using the North
American ANSI Color Code as follows:
TYPE COLOR
J Black
K Yello w
T Blue
E Purple
Thermocouple connectors have one
wide blade and one narrow blade. Do
not force connector in backwards.
Connect thermocouples to receptacles
at top of instrument as shown in the
following illustration:

- 10 -
Thermocouple wiring polarity must be
correct. If readings decrease as the
temperature increases, the thermo-
couple wires may be reversed. The red
wire is negative for thermocouple wires
manufactured in North America.
If no probe is connected the display
will read “open”.
Thermocouples are sensitive at the
tip or measuring junction. When
taking measurements, allow time for
the reading to stabilize. Multiplying
the time constant of the probe by 5
will give you the approximate time
required.

- 11 -
KEY FUNCTIONS
Note: Function keys change in setup
mode to provide advanced operation
flexibility. Text above key will indicate
function.
F1
Step through Min, Max and
Avg readings.
F2
Choose probe T1, T2 or T1-
T2
F3
Toggle between menu and
measure mode
hold
Freeze display
on/off
light
Turns meter on and off
(press and hold for 3
seconds to turn off)
Press momentarily to turn on
backlight
recall▲
Recalls and steps through
stored readings
log▼
Stores current measured
value to memory

- 12 -
DISPLAY OVERVIEW
The dot matrix display features a large
primary display, smaller secondary
displays for channel info or Min/Max/
Avg readings, and helpful annunciators
for added measurement data.
1
HOLD - Active
2
Data logging is Active
3
Alarm enabled –channel in alarm
indicated: T1 or T2 or T1&T2
4
MAX/MIN/AVG of Secondary
channel if MIN/MAX/AVG activated
5
MAX/MIN/AVG of Primary channel
if MIN/MAX/AVG activated
6
Min/Max hit time since Min/Max
activated. For Avg, it is continually
increments since activated
7
Current active Mode –
Min/Max/Avg
1
2
3
4
7
6
5

- 13 -
MEASUREMENT MODE
On initial start-up, the meter will display
the measured value for input one in the
primary display and for input two in the
secondary display.
Pressing the F2 key will toggle primary
display through input one (T1), input
two (T2), and the delta (T1 –T2) values.
Pressing the F1 key initiates and
toggles through Minimum, Maximum,
and Average reading modes.
Pressing F3 enter accesses Setup
mode.

- 14 -
HOLD FUNCTON
Press the hold key to retain the reading
on the display. Press the hold key again
for normal operation.
MIN, MAX, and AVG FUNCTION
Press the F1 key to toggle between
the minimum, maximum, and average
readings. This function is ideal for
monitoring unattended operations while
continually displaying every temperature
change that occurs. The minimum,
maximum, and average values are
sensed and automatically stored.
To exit and clear this function, press
the F3 key to access the Menu
functions. See the Clear Reset menu
section for more details.
DATA LOGGING
Press the log ▼ key to store the current
reading to memory. The memory
indicator M = 1234 shows the memory
location for the next stored reading.
Press the recall ▲key to review stored
readings.
See section on Data Logging for timed
logging, and logging to a computer
(model 91428-04 only).
See section on Clear/Reset for
information on clearing stored readings.

- 15 -
SETUP MODE
To access the setup mode from
measurement mode, press the F3 key
(Menu).
Press ▲▼ keys on the meter keypad
to scroll through options.
To enter a setup screen, press
Select F1 key.
To return to measurement mode press
Meas F3 key. Following menu options
are listed:
1. General setup
2. User field calibration
3. Alarm settings
4. Data logging settings
5. View user calibration report
6. Clear/reset options

- 16 -
GENERAL SETUP SCREEN
The first page of the General Setup
screen lets you set probe type,
measurement units, time, and date.
Press F1 to indicate you want to change
the setting of the current parameter or
recall▲ or log▼ to move to the next
parameter.
Press recall▲ or log▼ to change the
options.
Press F2 to choose the next setting.
Whenever set the options, press F1
for accepting the choice.

- 17 -
On the second page, you can set auto-off
time, line frequency, and password.
This screen below is used to reset/change
password. In the event if uses forget
his/her password, 5586 can be used to
reset to a new value

- 18 -
CALIBRATION SCREEN
The thermometer is factory calibrated and
does not require calibration before use.
The Calibration function allows single-
point calibration of the meter at 0°C (32°F)
to compensate for thermocouple offset
error. It is NOT necessary to perform a
field calibration to obtain specified meter
accuracy. Use the field calibration feature
to improve thermometer/probe accuracy or
to compensate for thermocouple drift.
Before you go into the calibration mode,
you must enter the password. Press F2
to change to the next digit. (Default
Password is 9900)
There are three calibration options:
Offset –adjusts at a single point
Slope –adjusts at two points
Match –adjusts readings on T1 to match
those on T2. Or adjusts T2 to match T1.