az-instrument 8851 User manual

OPERATION MANUAL
8851 . 8852
K.J.T. Type Thermometer
8855 . 8856
K.J.T.R.S.E. Type Thermometer
Model : 8851
8852
8855
8856

Controls and Indicators
1. REC - Starts record mode( relative
clock ), displays maximum and
minimum temperatures recorded on
the Primary screen along with the
relative time they were recorded.
2. MAX/MIN - Temperature recorded.
3. HOLD / REL - Freezes Primary
screen data or establishes a relative
zero for the Primary screen
information
4. BAT - Battery Low indication
Oo
5. F/ C - Toggles display data from
degrees Celsius to degrees
Fahrenheit.
6. T1-T2 Channel - Toggles screen
information from T1 (Primary) / T2
( Secondary ) to T2 Primary / T1
Secondary ,then to T1-T2(Differential)
on Primary and alternating T1/T2
temperatures on Secondary screen.
1234
10(T2)
5
11
6
12
13
6
7
9
8
10(T1)
1

7. Primary Data Screen - Displays T1,
T2, or T1 T2( temperature differential
-TD )or a relative zero of T1, T2, or
TD.
8. K.J.T.R.S.E. - Selects proper input
reference for thermocouple in use
( T1 and T2 must be the same type )
K.J.T or R.S.E.( model 8855.8856 )
9. Secondary Data Screen - Displays
T2, T1 or T1 and T2 alternately
10. Thermocouple Ports - Positive and
negative polarized plugs for the
thermocouple probes used ( Blade
type ); T1 on the left ,T2 on the right
11. Relative Clock Screen - Displays
time in hours and minutes & seconds
(H/M/S) when Record is pressed and
the relative time that MIN or MAX
data was recorded
12. RS232 output port
13. DC JACK
FUNCTIONAL DESCRIPTION
The meter will display all LCD segments
when it is first turned on, for
approximately 3 seconds. It will provide
information with either one (8851.8855)
or both thermocouples (8852.8856)
plugged in. Numerous viewing
combinations are available. The LCD is
divided into three distinct sections; one
large (Primary) top screen and two
smaller bottom screens (Secondary and
Relative Clock).
2

3
Temperature readings are easily
toggled between Fahrenheit and
Celsius
The back light illuminates the LCD
for viewing in low light areas
The HOLD button will freeze the
upper display data while allowing the
lower displays to continue updating
Information about selected functions
along with a low battery indicator is
also displayed as appropriate
The meter will default to the last
mode selected
The three display areas keep you
constantly updated with the temperature
measurements and relative time
information. You have a number of
options regarding how and what
information is presented on the LCD.
Note: If no thermocouples are plugged in,
four dashes(----) will appear in the
temperature data screens.
Model
8851
8852
8855
8856
Single
input
Dual
input Type Function
K.J.T.
K.J.T.
K.J.T.
R.S.E.
K.J.T.
R.S.E.
Timer
T1-T2
Channel
Timer
T1-T2
Channel

4
AUTO POWER OFF ( SLEEP MODE )
This instrument will shut off automatically
in approximately 20 minutes for every
power on. For recording or operating
over longer periods of time you can
disable the sleep mode by press and
simultaneously before power on.
An " n " will appear in the center of the
screen , at which time you can release
the power button. The disable sleep
mode will be invalid after power off.
Press momentarily and
simultaneously for 2 or more seconds
until Kappeared , by pressing C/F button
the type of probe cycles through K
(the default), Jand Tthermocouple types,
or R.S.E. type for model 8855 , 8856 .
The current mode is displayed on the
left side of the LCD. press , an
"S " will appear in the center of screen.
UNIT SELECTABLE

5
BUTTON RESPONSE / DISPLAY
Turns instrument on
( Default setting ) and off
Press momentarily and
the Primary display (T1, T2
or T1-T2) freezes with a
HOLD on the top; Press
for two or more seconds
-REL appears on top of
LCD and the REL Primary
display indicates the relative
zero HOLD (Relative zero
causes the value of the
primary display to show as
"000.0" -only the amount of
REL
HOLD
MODE OPTIONS
Delete and replace
with Programmable
user selectable
start-up mode. The
display will default
to the mode last
used. For your
convenience the
meter defaults to
the settings used
during the last
operation.
The following table lists the modes of
operation that can be invoked by
pressing the buttons indicated. The table
assumes your instrument has been
powered on with two thermocouples
installed and is set to display (default)
T1 on the primary display, type K
thermocouple, and Record off :

6
temperature change will be
indicated); Relative
temperatures can be
recorded. Press
momentarily again and the
unit returns to default
Press momentarily and the
Primary display changes to
T2 (Secondary screen
displays T1); press
momentarily again and it
displays T1-T2; Secondary
display alternates between
T1 and T2; Press
momentarily again and the
instrument returns to default
CHANNEL
(model:
8852.56)
press momentarily, H/M/S
(hours/minutes/seconds)
appears on button right
comer for relative time
reference while measuring
TIMER
(model:
8851.55)
Press momentarily and the
unit toggles between
Fahrenheit (the default) and
Celsius temperatures; The
current mode is indicated on
the right side of the LCD
Press momentarily and the
back-light illuminates for
approximately 30 seconds
then turns off.
oo
C / F
Press momentarily and the
Relative Clock starts in the
lower right screen, is
displayed in upper left of
LCD -All other button
functions are locked out
REC

7
REPLACING THE BATTERY
Replace your 9-volt battery when:
The BAT icon appears on the right
side of the LCD
The instrument will not power on
Use of the back-light causes the BAT
icon to appear
Even if the battery was recently replaced,
check its voltage level if you get no
response from your instrument.
except Power and Back-
light. T1, T2, or T1-T2 is
displayed on the Primary
screen; The Secondary
screen continues to update.
Press momentarily again
and the unit cycles through
MAX and MIN (maximum
and Minimum recorded
temperatures) and back to
current temperature; The
record mode is displayed on
the LCD. Press and hold
for three seconds to
turn off the record function
To replace the batteries:
1. Remove the thermocouples from the
top of the instrument.
2. Lay the instrument face down on a
clean, flat surface.
3. Remove the battery cover by a screw
driver
4. Replace the battery, observing
indicated polarity and close the cover
by screw driver.

8
Remove batteries from instruments that
you do not plan to use for a month or
more. Do not leave batteries in
instruments that may be exposed to
temperature extremes.
MATERIALS SUPPLIED
This package contains:
The meter x 1
Type K thermocouple probes x 1
Battery x 1
Manual
Hard plastic case
Rubber Holster
CD (optional software w / D-Sub
connector.
2nd K thermocouple probes.
Optional accessory :
SAFETY
Place ONLY thermocouples (type K,
J, or T ) in the thermocouple ports
(model 8851.8852)or only(type K.J.T.
R.S.E) for model 8855.8856.
Make sure your meter is set for the
proper thermocouple type you are
using.
Be sure the thermocouple you use
can withstand the temperature
extreme it may be exposed to in your
service task.
Properly maintain your meter and
calibrate it regularly

TROUBLESHOOTING
Q 1
Check
Action
Check
Action
: Instrument does not turn on
:1.Battery voltage
:1.Replace low battery
:2.Battery installation
:2.Ensure clip grips battery posts
tightly
Q 2
Check
Action
:Dashes appear in T1 and T2
data screens
:Thermocouples
:Insert missing thermocouples
Q 3
Check
Action
Check
Action
:Dashes appear in T1 and/or T2
data screens with
thermocouples inserted
:1.Thermocouple continuity
:1.Measure resistance of
thermocouples to ensure they
are not broken internally -
Replace if required
:2.Thermocouple connection
:2.Clean corrosion or debris off
of thermocouple - Reinsert
9
( No T1 plugged in )
(No T2 plugged in)

10
Q 4
Check
Action
Check
Action
Check
Action
:Temperature drifts from known
value in a controlled
environment
:1.Thermocouple type
:1.Ensure thermocouple type
matches the displayed icon
:2.Moisture, corrosion or debris
on thermocouple
:2.Clean and dry thermocouple
blades - Allow thermocouple
plug to air dry
:3.Defective thermocouple
:3.Confirm defect with known
good thermocouple - Replace
if required
Q 5
Check
Action
:Relative clock will not start when
RECORD button is pressed
:Thermocouples properly inserted
:Record will not start without
thermocouples inserted
:Dashes appear during review of
maximum recorded value
:Open thermocouple
:Check for intermittent or
momentarily removed,
thermocouple
Q 6
Check
Action
Q 7
Check
Action
:Data continues to update when
HOLD or RECORD are invoked
:1.Proper operation
:1.Hold and Record affect the
Primary screen of info only

:2.Hold/Record is not being fully
pressed
:2.Observe HOLD or REC icons
on LCD Press button firmly
Check
Action
11
:Instrument turns off during
recording
:Auto power off defeat
:Follow procedures outlined in
Operating Instructions
Q 8
Check
Action
OPERATING CONDITIONS
oo
32 to 122 F (0 to 50 C) at 0 to 85 %
relative humidity (non-condensing)
Resolution ( All model )
Ko
-200~650 C o 0.1C
o
640~1370 C o
1C
o
-328~1000 F o
0.1F
o
990~2498 F o 1F
Jo
-200~500 C o 0.1C
o
490~760 C o 1C
o
-328~940 C o
0.1C
o
930~1400 C o
1F
TAll range o
0.1C
All range o
0.1F
Following type only available for 8855 . 8856
R/S o
0~1000 C o 0.1C
o
990~1760 C o 1C
o
32~1000 F o
0.1F
o
990~3200 F o
1F
E o
-200~380 C o
0.1C
o
370~736 C o
1C
o
-328~720 F o
0.1F
o
710~1832 F o
1F

The meter is warranted to be free from
defects in material and workmanship for
a period of one years from the date of
purchase. This warranty covers normal
operation and does not cover batteries,
misuse, abuse, alteration, tampering,
neglect, improper maintenance, or
damage resulting from leaking batteries.
Proof of purchase is required for
warranty repairs.
WARRANTY
T1-T2 Measurement, accuracy
Measurement Range Accuracy
Ko
-200~1370 C o
(0.1% rdg+0.7C )
o
-328~2498 F o
(0.1% rdg+1.4F )
Jo
-200~760 C o
(0.1% rdg+0.7C )
o
-328~940 C o
(0.1% rdg+1.4F )
T o
-200~390 C o
(0.1% rdg+0.7C )
o
-328~730 C o
(0.1% rdg+1.4F )
Ro
0~1000 C o
(0.3% rdg+0.7C )
o
0~3200 F o
(0.3% rdg+1.4F )
So
0~1760 C o
(0.3% rdg+0.7C )
o
0~3200 F o
(0.3% rdg+1.4F )
E o
-200~736 C o
(0.1% rdg+0.7C )
o
-328~1832 F o
(0.1% rdg+1.4F )
Ambient Coefficient
oo
0 - 18 C and 28- 50 C (Ambient
temperatures)
oo
For each C ambient below 18 C or
o
above 28 C, add the following tolerance
into the accuracy spec: 0.01% of reading
oo
+0.03 C (0.01% of reading+0.06 F)
12

Accuracy, the Zenith of
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