This thermohygrometer was calibrated
using equipment traceable to the National
Institute of Standards and Technology
(NIST).
Temperature measurements conform to
ITS-90.
The accuracy of the thermohygrometer at
the time of calibration was within
specifications stated in the operating
manual.
Model No.: ________________________
Serial Number: _____________________
Date placed in service:_______________
To purchase an NIST certificate of
traceability with test data and test date for
meter and probe, please contact your
ITS-90
dealer.
INTRODUCTION
This versatile hand-held instrument provides
highly accurate relative humidity
measurements and temperature with
calculated dew point in Celsius or Fahrenheit.
This instrument covers the extended
measuring range of 0 to 100% RH, –40 to
+140°F (–40 to +60°C) temperature, and –130
to +140°F (–90 to +60°C) for dew point.
The instrument is designed for easy operation
and includes the following features:
Operator selection of temperature scale
Resolution of 0.1 (% RH, °F, °C, and DP)
LCD with three four-digit displays
Six-pin circular DIN connector input for
probe
Hold feature for temporarily retaining a
reading
Two-point field calibration capability for
humidity or temperature
- 1 -
Low-battery warning
Stores or logs up to 1000 readings with
realtime markers
Scrolls through all stored readings
Displays MIN and MAX readings
Interfaces with optional Testo
printer or optional RS-232-C adapter
Prints temperature, humidity, dew point,
and time of reading
Detachable and interchangeable
humidity/temperature probe
Built-in tilt stand for easy hands-free
operation
infrared
SAFETY PRECAUTIONS
DO NOT USE OR
CAUTION
MICROWAVE OVENS OR ANY
ABNORMALLY HOT OR COLD AREAS.
CAUTION
INSTRUMENT. DEAD BATTERIES CAN
LEAK AND CAUSE DAMAGE TO UNIT.
Range: –90°C to +60°C (–130°F to +140°F)
Accuracy: Accuracy of the calculated dew point
depends on the accuracies of the
measured temperature and humidity values.
The following table reflects dew point
accuracy given sensor measurement
accuracies of ±0.5°C and ±2% RH.
Accuracy of Dew Point Temperature (±°C)
–40 –30 –20 –10 0 10 20 30 40 50 60
Temperature (°C)
- 3 -
Dimensions (L × W × H):
21.3 cm × 3.2 cm × 4.4 cm
(8-3/8 in × 1-1/4 in × 1-3/4 in)
Insertion Diameter: 1.64 cm (0.65 in) at 3.30 cm
(1.3 in) depth
Compatible with Calibration Salts
(See ACCESSORIES on inside back cover.)
Cable Length: 91 cm (3 ft)
Weight: 114 g (4 oz)
Color: Black
LOGGER
Linearization:Temperature measurements
conform to ITS-90
Input Protection: 10 V rms
Display Update: 0.6 seconds per update
Connector: Circular 6-pin DIN
Dimensions (D × W × H):
3 cm × 8.4 cm × 15.8 cm
(1.2 in × 3.3 in × 6.2 in)
Weight with Batteries: 227 grams (8 ounces)
Ingress Protection: Meets IEC-60529 IP-54 for
dust- and water-resistant enclosures.
Compliance: For CE Mark:
EN61326-1/A1: 1998 (EU EMC Directive)
Battery
Size: Two AA, 1.5 V alkaline ANSI-L40,
IEC-LR6
Life: >200 hours continuous, typical
Display: LCD with 10 mm (0.4 in) high
characters main readout and 5 mm (0.2 in)
high characters secondary displays, 4 digits
each display plus various annunciators.
LOGGER OPERATING HUMIDITY /
TEMPERATURE RANGE:
Operating Temperature: 0 to 40°C (32 to 104°F)
Storage Temperature: –40 to 65°C (–40 to
149°F)
Humidity: 10% to 90% (non-condensing)
Altitude: Up to 2000 m (6560 ft)
- 4 -
BATTERY INSTALLATION AND
REPLACEMENT
WEAK BATTERIES
CAUTION
INSTRUMENT. DEAD BATTERIES CAN
LEAK AND CAUSE DAMAGE TO UNIT.
When battery indicator illuminates, battery life
is approximately 8 to 10 hours. The battery
indicator starts flashing when battery life is
less than one hour. At that point, the battery
must be changed. If the battery charge
gets too low, the display blanks.
See SPECIFICATIONS for correct battery
type.
1) Before changing battery, turn instrument
off and disconnect probe.
2) Loosen screw and lift battery cover off
back of case.
3) Remove the two AA batteries.
4) Observe polarity, and insert two new
batteries.
5) Install cover and tighten screw.
SHOULD NOT BE
LEFT IN THE
- 5 -
AC ADAPTER
An optional AC adapter can be used for power
to conserve batteries. The adapter is not a
charger and will not charge batteries. The
adapter connects to the bottom of the
instrument. When the adapter is connected,
the batteries are disconnected.
Refer to ACCESSORIES for adapter
information.
CONNECTING THE PROBE
A five-pin socket is located at the top of the
instrument. Align the slot locator in the plug of
the probe with the slot in the socket as shown
below. Insert the plug fully into the socket and
turn the locking ring clockwise to secure the
attachment.
- 6 -
Maximum reading
displayed
Day being set
display
in SETUP
RECALL PRINTSTORE LOG
PRINT
Month
Recall
Log
operation
activated
being set in
SETUP
reading
activated
Temperature
display in °F or °C
%RH
Relative humidity
indicator
Main Display
Right-side secondary
Dew point
indicator
DP
°F°C
888.8
Tim e Dis play ed
Low battery
warning
Field calibration
is active
Left-side secondary
displ ay
- 7 -
YR MINMAX DAYHOLD MO
-88:8.8-888.8
CAL
Year being set
in SETUP
Reading
stored
Minimum
Display
Hold
reading
displayed
indicator
- 8 -
STORE
°C/°F
HOLD
Press to store current reading. Up to
1000 readings can b e stored with time
occurrence.
Press to select °C or °F temperature
scales.
Press to freeze reading in display.
Press again to unfreeze. (See
CALIBRATION
FOR FUNCTION. )
RECALL
LOG
MAX
CLEAR
PRINT
MIN
ON/OFF
SETUP
CAL
Press to enter recall mode.
Press to activate and deact ivate log
function.
Press to see briefly the maximum
reading since power up or clear. (See
CALIBRATION SETUP
RECALL for function.
Press to see initiate clear action. CAL,
MAX, MIN, STORE, PRINT, and LOG
are prompted to complete.
Press to activate and deact ivate
infrared output.
Press to see briefly the minimum
reading since p ower up to clear. (See
CALIBRATION ETUP
RECALL
Press to power up or turn off.
Press to select display characteristics,
dew point, scale, resolution, filter rate,
to set the real-time clock, and access
to LOG and PRINT submenus.
Press to enter field calib ration mode.
(See .)
, , and
, S, and
for x function.
CALIBRATION
- 9 -
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