MADE IN TAIWAN
OPERATING INSTRUCTIONS
HH804U
DUAL INPUT RTD THERMOMETER
INTRODUCTION
This instrument is a 4_ digit, compact-sized portable digital thermometer
designed to use external 100_ Platinum RTD as temperature sensor. Tem-
perature indication follows Reference Temperature/Resistance Tables (Pt385
for European Curve, Alpha=.00385. Pt3926 for American Curve, Al
pha=.003926. Pt3916 for Japan Curve, Alpha=.003916.)
SAFETY INFORMATION
It is recommended that you read the safety and operation instructions before
using the thermometer.
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 take temperature measurements in micro-
wave ovens.
ENVIRONMENTAL
Ambient Operating Ranges:
0°C to 50°C (32°F to 122°F) <70% R.H.
Storage Temperature:
-20°C to 60°C (-4°F to 140°F) <80% R.H.
GENERAL
Display:
4_ digit liquid crystal display (LCD) with maximum reading of 19999
Overload:
“----.-“ or “OL” is display.
Battery:
1.5V x 4 PCS (SIZE AAA) R03P.
Battery Life:
200 hours typical with carbon zinc battery
Auto power off:
30 minutes
Dimensions:
160mm(H) x83mm(W) x 38mm(D)
Weight:
Approx. 255g including batteries.
SPECIFICATIONS
ELECTRICAL
Temperature Scale:
Celsius or Fahrenheit user-selectable
Measurement Range:
Pt385(100_) -200°C to 800°C, (-328°F to 1472°F)
Pt3916/Pt3926(100_) -200°C to 630°C, (-328°F to 1166°F)
Resolution:
0.1°C or 0.2°F
Accuracy:
Accuracy is specified for operating temperatures over the range of 18°C to
28°C (64°F to 82°F), for 1 year, not including RTD probe error.
±(0.05% rdg + 0.2°C) on °C scale
±(0.05% rdg + 0.4°F) on °F scale
Temperature Coefficient:
0.1 times the applicable accuracy specification per °C from 0°C to 18°C 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.
Maximum Differential Common Mode Voltage (Maximum Voltage be-
tween T1 and T2 during measurement):
1volt.
Reading Rate:
1sample/second.
Input Connector:
Accepts 4 pin mini-DIN connectors.
OPERATING INSTRUCTIONS
1.
Power Button
The
button turns the thermometer on or off. In the SET mode the unit
cannot be powered off. Exit the SET mode to power off.
APO function mode
Press “
” power button for more than 6 seconds to disable auto power
function. The display will show “APO OFF”.
2.°C/°F Selecting the Temperature Scale (Main display)
Readings are displayed in either degrees Celsius(°C) or degrees Fahren-
heit(°F). When the thermometer is turned on, it is set to the temperature
scale that was in use when the thermometer was last turned off. To change
the temperature scale, press the °C/°F key.
3. “
” Display Back-Light
Press the “
” key to turn on or turn off the back light.
4. T1 T2/T1-T2 Main display Input Selection
The input selection button determines which input is shown on the
display; T1 ,T2 or the difference between the two probes (T1-T2). When
thermometer is turned on, it is set to T1.
5. TYPE(Pt385/Pt3926/Pt3916) Input RTD Probe Select (Main display)
The TYPE button selects the RTD curve to use for the input currently
shown. When the thermometer is turned on, it is set to the curve that
selected when the thermometer was last turned off.
6. MIN MAX with Time record Mode (only Main display)
Press MIN MAX key to enter the MIN MAX Recording mode, (displays
Maximum reading with time, Minimum reading with time and Average
reading stored in recording mode). In the this mode the automatic power-off
feature is disabled and
key, °C/°F key, REL key, SET key, Hi/Lo Li
key and main display T1 T2 T1- T2 key, TYPE key are disabled.
beeper emits a tone when a new minimum or maximum value is recorded.
Push MIN MAX key to cycle through the MAX, MIN and AVG readings.
If an overload is recorded, the averaging function is Stopped. In the
mode, press HOLD key to stop the recording of readings, all values are
zen, press again to restart recording. To prevent accidental loss of
MAX and AVG data, in this mode can only be cancelled by pressing
hold down the MIN MAX key for 2 seconds to exit and erased recorded
readings.
7. REL Relative mode (only Main display)
Press REL key to enter the Relative mode, zero the display, and store
displayed Reading as a reference value and annunciator REL is displayed.
Press REL key again to exit the relative mode. The relative value can
be entered by the user. (See “SET mode”later in this manual.) When the
sired Relative value has been entered, press REL key to enter the Relative
mode, press SET key use set Relative value as a reference value. Press
key again to exit the relative mode. In the Relative mode, the value (can
>±1999.9 counts) shown on the LCD is always the difference between
stored reference and the present reading.
8. HOLD Mode (only Main display)
Press the HOLD key to enter the Data Hold mode, the “HOLD” annunciator
is displayed. When HOLD mode is selected, the thermometer held the
sent readings and stops all further measurements. Press the HOLD
again to cancel HOLD mode causing thermometer to resume taking
ureents. In the MIN/MAX recording mode, press HOLD key to stop the
cording. Press HOLD key again to resume recording. (Previously recorded
read are not erased).
9. SET mode (Relative value set, Time set and Hi/Lo Limits value set)
Press SET key to enter Relative values SET mode (Press ENTER key
escape relative values set mode), REL set mode. = = = =.= is displayed
main display. Relative value is entered via overlay numbers, then
HH804U
®
