Digi-Sense 91428-07 User manual

Instruction Manual
Single-Input
RTD Thermometer
(Model 91428-07)
68X001350 Rev0 0717 065DGMAN_91428-07
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TABLE OF CONTENTS
QUICK-START GUIDE............................. 1
1. INTRODUCTION................................ 2
2. SAFETY PRECAUTIONS................... 3
3. SPECIFICATIONS.............................. 4
4. BATTERY INSTALLATION AND
REPLACEMENT................................. 6
5. INSERTING AND REMOVING
OPTIONAL RUBBER ARMOR............ 7
6. ASSEMBLING OPTIONAL HANDS-
FREE ACCESORIES.......................... 8
7. CONNECTING AN RTD PROBE........ 9
8. KEY FUNCTIONS..............................10
9. DISPLAY OVERVIEW .......................11
10. MEASUREMENT MODE ...................12
11. SELECTING TEMPERATURE
SCALE ..............................................13
12. MIN AND MAX FUNCTION................14
13. AUTO OFF FUNCTION.....................14
14. CALIBRATION...................................15
15. CLEAR FIELD CALIBRATION...........16
16. FIELD CALIBRATION UNLOCK........16
17. FIELD CALIBRATION LOCKOUT......17
18. MAINTENANCE.................................18
19. CLEANING........................................18
20. TROUBLESHOOTING.......................19
21. SERVICE...........................................20
22. REPLACEMENT METER &
ACCESSORIES.................................20
23. WARRANTY......................................21
24. PRODUCT RETURN.........................21
25. INNOCAL® CALIBRATION AND
REPAIR SERVICES ..........................22
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- 1 -
QUICK- START GUIDE
To ensure best results please read the
complete manual.
1. Connect probe.
2. Press the on/off key.
Press again to turn on backlight.
3. Select °C or °F display using °C/°F key.
4. Insert probe in sample.
Allow adequate time for reading to
stabilize.
Response time will vary depending on
probe.
5. Take reading.
Press hold key to freeze display.
Press min/max to display minimum or
maximum temperature.
6. Press and hold the on/off key for three
seconds to turn meter off.
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- 2 -
1. INTRODUCTION
This versatile handheld
instrument provides highly
accurate temperature
measurements and is
designed for easy operation,
which includes the following
features:
xOperator selection of Celsius or
Fahrenheit scale
xResolution of 0.1° (auto ranging)
xFour-digit backlit LCD
xHold feature to retain a reading
temporarily
xField calibration capability
xLow-battery warning
xAuto power off with Enable/Disable
function
xMin and Max readings display
x3-pin circular connector input
xOperates with a wide selection of
probes
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- 3 -
2. SAFETY PRECAUTIONS
Voltages present at the RTD may also be
present at the battery terminals. Always
disconnect the RTD when changing
batteries.
This instrument is designed to accept low
level signals supplied by standard 100 Ω
RTDs. Under no circumstances should the
input voltage exceed the specified 10V rms.
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.
WWARNING
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- 4 -
3. SPECIFICATIONS
Platinum RTD Probes
100 ohm platinum: alpha = 0.003850
–200 to 850°C (–392 to 1562°F)
Out-of-range display: “Ur”, “Or”, “OPEN”
Range
Accuracy
–200.0 to –100.0°C
(–392 to –148°F)
±2.0°C
(±4.0°F)
–99.9 to 199.9°C
(–148 to 392°F)
±0.2°C
(±0.4°F)
200.0 to 850.0°C
(392 to 1562°F)
±2.0°C
(±4.0°F)
Resolution
0.1° (–200.0 to 850.0°C);
0.1° (
–392.0 to 999.9°F);
1° (1000 to 1562°F)
Display
4-digit LCD (¼ x ½" digits);
2
1/3x
1 ½" backlit viewing
area
Display update
rate
0.5 sec per updat
e
Input
One probe with 3 pin circular
connector (Switchcraft TA3F)
Input protection
10V rms
Battery
Three AA, 1.5V alkaline
Battery life
700 hours continuous
Auto
shutoff
17 minutes after last
keypress
Stated
accuracy
18 to 28°C
(64 to 82°F)
Useful
range
0 to 40°C
(32 to 104°F)
Storage
–40 to 65°C
(–40 to 149°F)
Humidity
10% to 90% RH
(noncondensing)
Dimensions
Without armor
With armor
(L x W x H )
175 mm x 97 mm x 42 mm
180 mm x 102 mm x 52 mm
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- 5 -
Weight
Without armor
With armor
267 g
362 g
Ingress protection
(
with probe
attached)
Meets IEC-529 IP54 for
dust
and water-resistant
enclosures
CE
compliance
EN61326-1/A1:
1998 (EU EMC Directive)
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- 6 -
4. BATTERY INSTALLATION AND
REPLACEMENT
Voltages present at the RTD may also be
present at the battery terminals. Always
disconnect the RTD when changing
batteries.
Weak batteries should not be left in the
instrument. Dead batteries can leak and
cause damage to unit.
The typical battery life is about 700 hours.
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 batter y , tur n
instrume
nt off and disconnect probe .
2.
Loosen screw and lift batter y cover off
the
back of case.
3.
Remove the t hree AA batteries.
4. Insert three
new batteri es observing
pol
arit y .
5. Install
cover and tig h ten screw .
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- 7 -
5. INSERTING AND REMOVING
OPTIONAL RUBBER ARMOR
Figure 1: Removing Optional 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.
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- 8 -
6. ASSEMBLING OPTIONAL
HANDS-FREE ACCESORIES
You can use the optional magnets and
strap in the Hands-Free Kit accessories for
hands-free operations.
Figure 2: Hands-Free Kit
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- 9 -
7. CONNECTING AN RTD PROBE
Use the correct 100 Ω RTD (alpha =
0.003850) for your instrument. Using an
incorrect probe type will result in erroneous
readings. Insert the 3-pin plug into the
mating connector on the top of the
instrument.
Figure 3: Top view of RTD thermometer
RTD Input
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- 10 -
8. KEY FUNCTIONS
Figure 4: Keypad
Toggle
s between Celsius or
Fahrenheit
in measurement mode
and user calibration mode.
Press and hold this key for 3 seconds
to enter Calibration mode if field
calibration is unprotected.
Activates/deactivates freezing of the
measured reading while in
measurement mode.
Toggles between minimum and
maximum readings
(MIN and MAX
readings are calculated from the last
min/max
keypress).
Press and hold this key
for 3
seconds to clear the MIN/MAX
reading stored.
Powers on and shuts off the
thermometer by holding it for
3 seconds.
Press this key to
activate/ deact
ivate
the backlight display. (Backlight will
automatically turn
off within 30
seconds of activation).
°C/°F
cal
hold
min
max
on/off
light
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- 11 -
9. DISPLAY OVERVIEW
Figure 5: Meter Display
°C/°F
Celsius or Fahrenheit indicator.
MIN
Minimum reading annunciator.
MAX
Maximum reading annunciator.
3 Bars: 700 –550 hours
2 Bar
s: 350 –550 hours
1 Bar:
150 –350 hours
Blinking: < 150 hours
CAL
Blinks during calibration mode.
Remains in display indicating
field calibration is active.
HOLD
Remain in display during hold
mode.
STABLE
Displayed upon recognizing
final value.
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- 12 -
10. MEASUREMENT MODE
Press the on/off key. The thermometer
performs a self-test and all display digits
and indicators should remain on for
approximately two seconds before the
meter enters measurement mode.
If a probe is not connected or if the probe is
defective, the display will indicate “OPEN”.
Figure 6: Display when no probe is detected
For optimum instrument accuracy, allow one
minute for ambient temperature stabilization.
If the unit has been stored at an extreme
ambient condition, more time will be needed.
A STABLE indicator appears at the top right
corner of the display when reading is
continuously stable for 5 seconds.
To freeze reading, press hold. Press hold
key again to release the reading and resume
normal operation.
Figure 7: HOLD and STABLE function
The display will show “Ur” (under range) or
“Or” (over range) if the temperature reading
is out of range of the instrument.
°c
24.6
°c
HOLD STABLE
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- 13 -
11. SELECTING TEMPERATURE
SCALE
Figure 8: Press °C/°F key to toggle
between °C and °F
Select °C or °F by pressing the °C/°F key.
Each time the key is pressed, the
temperature scale will switch. Switching
between °C and °F can be done at any time
during operation.
Each time you turn the instrument on, it will
power up with the same settings that were
set when the unit was last turned off.
24.6
°c
75.4
°F
°C/°F
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- 14 -
12. MIN AND MAX FUNCTION
Press the min/max key to toggle between
the minimum and maximum readings. The
minimum and maximum reading function is
ideal for monitoring unattended operations
while continually displaying every
temperature change that occurs. The
minimum and maximum values are sensed
and automatically stored. To exit and clear
the MIN/MAX reading stored, press and hold
the min/max key for 3 seconds.
13. AUTO OFF FUNCTION
The thermometer has a default auto off
function of 17 minutes.
To deactivate this function, press the
min/max key while turning the thermometer
on with the on/off key. “A.OFF no” flashes
to show indicate that the auto off function
has been disabled for that session.
Figure 9: Disabling the auto off function
A.of f
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14. CALIBRATION
The CAL function allows single point
calibration of the thermometer at 0°C (32°F)
to compensate for probe offset error. Use
the field calibration feature to improve
thermometer/probe accuracy.
The thermometer comes with a calibration
lock function to prevent accidental changes
to calibration settings. A field calibration can
only be performed when the function has
been unlocked. To unlock field calibration,
follow steps 1 through 4 in FIELD
CALIBRATION UNLOCK section.
To calibrate:
1. Pack sensing end of probe in a
container tightly packed with crushed ice
and filled with distilled water. Allow
temperature to stabilize.
2. Press and release the cal key for
3 seconds to enter the calibration
mode. The CAL indicator starts blinking.
Release the cal key.
3. If the measured temperature is from
–5°C to 5°C (23 to 41°F) when the
temperature reading is stable, press
the cal key.
The CAL indicator will stop blinking, and the
reading will be set to 0°C (32°F). The CAL
indicator will remain in display, indicating
that field calibration is now active.
If “Err” is displayed, the displayed reading
is outside the above limits.
NOTE: Press any key (except the cal key)
while in calibration mode to abort calibration.
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- 16 -
15. CLEAR FIELD CALIBRATION
To clear user calibration:
1. Turn the thermometer off.
2. Hold the cal key down while pressing
the on/off key.
3. The measurement mode window
appears without the CAL indicator to
indicate that the user calibration has
been successfully cleared.
16. FIELD CALIBRATION UNLOCK
The calibration unlock feature enables field
calibration operation. To unlock field
calibration:
1. Turn the thermometer off.
2. Hold the cal key and hold key down
simultaneously, then press the on/off
key.
3. The “CAL” indicator appears
momentarily with the version-model
window to indicate that the user-
calibration function has been unlocked
successfully (Figure 10).
Figure 10: Successful field calibration unlock
CAL
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- 17 -
4. When the cal and hold keys are
released, the unit will go to
measurement mode (Figure 11).
Figure 11: Unit goes to measurement mode
17. FIELD CALIBRATION LOCKOUT
The calibration lockout feature prevents any
field calibration changes. The lockout
remains in effect until an unlock has been
performed. To lock the field calibration
operation:
1. Turn the thermometer off.
2. Hold the cal key and °C/°F key down
simultaneously, then press the on/off
key. Do not release cal and °C/°F keys
until the measurement mode is on
display.
3. If field calibration lockout is successful,
the version-model window appears
without the CAL indicator (Figure 12).
Figure 12: Successful field calibration lockout
°c
STABLE
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- 18 -
4. When the cal and °C/°F keys are
released, the unit will return to
measurement mode (Figure 13).
Figure 13: Unit returns to measurement mode
18. MAINTENANCE
Properly used, the thermometer should
maintain calibration indefinitely and not
require service other than occasional
cleaning of the housing and changing of the
batteries. Do not clean with abrasives or
solvents. Use mild detergents; never
immerse nor use excessive fluid.
19. CLEANING
WARNING:
TO PREVENT IGNITION OF A
HAZARDOUS ATMOSPHERE BY
ELECTROSTATIC DISCHARGE, CLEAN
WITH DAMP CLOTH.
Do not clean with abrasives or solvents.
Use mild detergents, never immerse nor
use excessive fluid.
°c
STABLE
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