OPERATOR’S MANUAL
MODEL 502A
K/J/T/E/R/S/N THERMOMETER
1
4
7
10
2
3
5
6
8
9
11
12
2 Display
nd
Main
Display
3 Display
rd
MULTILOGGER
APO HOLD T1 T2
THERMOMETER
DISPLAY
° °
C/ F
[Limits]
[INVT]
SET [ ]
READ
LOG
CLR ?
READ
SAVE
[OFS]
[APO]
SHIFT
HOLD
REL
T1-T2
TYPE
[TIME]
T1/T2
TYPE
T1/T2
ESC
0
ENTER
1
2
3
4
5
6
7
8
9
MAIN
SECOND
THIRD
INTRODUCTION
The instrument is a portable digital thermometer that
measures external thermocouples of type K, J, R, S, T, E,
N. The thermocouples types comply with the N.I.S.T. - ITS
90 standard reference temperature/voltage tables. The
thermometer features a dual thermocouple input, an ad-
justable T/C offset and an RS-232 interface for uploading
data to a PC using optional software and cable.
SAFETY INFORMATION
To avoid electrical shocks, do not use the device when the
working voltages exceed 24V AC or DC. To avoid damag-
es to the instrument and/or physical burns, do not make
measurements in microwave ovens. Avoid sharp bending
of the thermocouple leads to prolong its life, especially
near the connector.
WARNING
To avoid electrical shock, do not use this instrument
when working voltages at the measurement surface
over 24V AC or DC.
WARNING
To avoid damage or burns, do not make temperature
measurement in microwave ovens.
CAUTION
Repeated sharp flexing can break the thermocouple
leads. To prolong lead life, avoid sharp bends in the
leads, especially near the connector.
GENERAL
Displays:
Main Second Third the Main and 2
nd
display
panels are 4½ digit liquid crystal display (LCD) with
maximum reading of 19999, these panels are use for
displaying the value of T1 or T2. The Third panel dis-
plays the date, time, or the difference value of T1 to T2.
When the input measurement is overloaded, the follow-
ing is displayed “
.
”.
Battery:
Standard 9V battery. (NEDA 1604, IEC 6F22
006P). Battery life is about 100 hours when used with a
carbon zinc battery.
Dimensions:
192mm(H) x 91mm(W) x 52.5mm(D).
Weight:
365g.
Supplied Wire:
4 feet type “K” thermocouple bead wire
(Teflon tape insulated). Maximum insulation tempera-
ture 260°C (500°F). Wire accuracy ±2.2°C or ±0.75% of
reading (whichever is greater) from 0°C to 800°C.
Software download link:
http://WWW.chy-meter.com//data/outer_web/1492-00502
A/1492-00502A-114.zip
ENVIRONMENTAL
Ambient Operating Ranges:
0°C to 50°C (32°F to 122°F) <80% R.H.
Storage Temperature:
-20°C to 60°C (-4°F to 140°F) <70% R.H.
Input Connector:
Accepts standard miniature thermocou-
ple connectors (flat blades spaced 7.9mm, center to
center).
SPECIFICATIONS
ELECTRICAL
Temperature Scale:
Celsius or Fahrenheit.
Measurement Range:
K-TYPE (0.1°)
-200°C to 1372°C,
-328°F to 2501°F
J-TYPE (0.1°)
-210°C to 1200°C,
-346°F to 2192°F
T-TYPE (0.1°)
-200°C to 400°C,
-328°F to 752°F
E-TYPE (0.1°)
-210°C to 1000°C,
-346°F to 1832°F
R-TYPE (1°)
0°C to 1767°C,
32°F to 3212°F
S-TYPE (1°)
0°C to 1767°C,
32°F to 3212°F
N-TYPE (0.1°)
-50°C to 1300°C,
-58°F to 2372°F
*Based on the ITS-90 temperature standard.
According to temperature standard ITS-90.
Accuracy:
K/J/T/E-TYPE
±(0.05% rdg + 0.3°C) on -50°C to 1372°C
±(0.05% rdg + 0.7°C) on -50°C to -210°C
±(0.05% rdg + 0.6°F) on -58°F to 2501°F
±(0.05% rdg + 1.4°F) on -58°F to -346°F
N-TYPE
±(0.05% rdg + 0.8°C) on -50°C to 0°C
±(0.05% rdg + 0.4°C) on 0°C to 1300°C
±(0.05% rdg + 1.6°F) on -58°F to 32°F
±(0.05% rdg + 0.8°F) on 32°F to 2372°F
R/S-TYPE
±(0.05% rdg + 2°C) on 0°C to 1767°C
±(0.05% rdg + 4°F) on 32°F to 3212°F
Temperature Coefficient:
0.1 times the applicable accu-
racy specification per °C from 0°C to 18 and 28°C to
50°C (32°F to 64°F and 82°F to 122°F)
Input Protection:
24V dc or 24V ac rms maximum input
voltage on any combination of input pins.
Reading Rate:
2.5 time per second.
Top Side:
1. Socket of Power. (DC 12V)
2. RS232 (Optical Interfaced) Port.
3. Min DIN I/O Port.
4. Sockets of thermocouples T1.
5. Sockets of thermocouples T2.
5
3
2
1
4
Fig. 1
OPERATING INSTRUCTIONS
Operational Mode
There are three operation modes - Normal, Shift, and Set-
up Mode.
Normal Mode:
This is the default mode; the operating functions for the
normal mode are printed on the top of each button in white
color.
Shift mode:
The operating functions for the shift mode are printed in
yellow color on the buttons. While in the normal mode,
push the SHIFT button to switch to shift mode. At the
lower-right corner of the display panel, the word “Shift” is
displayed to indicate shift mode. To switch back to normal
mode, press the SHIFT button.
Setup mode:
The operating functions for the setup mode are printed in
between two bracket signs “[ ]”on each button. Press the
SET[] button in normal mode to switch to setup mode, the
indicator “SET” is shown on the left side of the display
panel. To switch back to normal mode, press SET[] button.
NORMAL MODE
The following functions can only be use in the normal
mode.
(1) “ ” Power Button
The
button turns the thermometer on or off. When
entering data set mode, the power off function is disa-
bled.
(2) “Limits” Button (only Main display)
The limits function will alert the user when a meas-
urement exceeds a specified limit. To set the limit val-
ues, refer to limits function in the setup mode.
Press the [Limits] button to activate the limits function;
the word “LIMIT” should be displayed on the LCD.
When the value of the main display exceeds the Hi
limit, the word “Hi” will be displayed and the ther-
mometer will beep in an interval frequency. If the val-
ue of the main display is lower then the Lo limit, the
word “Lo” will be displayed and the thermometer will
beep in a continuous frequency.
In limits function, on K, J, type and the scale of tem-
perature at °F when the reading over 2000°F then the
reading counts should be time 10. (ex: 2100°F means
21000 counts)
To exit the limits function, press the [Limits] button.
(3) “ ” Button
The backlight function is represented by this button
“
” Pressing the button will turn on or off the back-
light in the LCD.
