Extech Instruments 4465CF, 446580 User Manual
User's Guide
Hygro-Thermometers
Models 4465CF and
446580
Introduction
Congratulations on your purchase of the Extech 4465CF or 446580 Hygro-Thermo meter.
The Extech Hygro-Thermometers measure and display temperature and relative
humidity. The 446580 has a PC interface and built-in datalogging capabilities. Careful
use of these meters will provide years of reliable service.
Model 446580 Version 2.0 June 2004
2
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables).
If it should become necessary to return the instrument for service during or beyond the warranty period,
contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website
www.extech.com for contact information. A Return Authorization (RA) number must be issued before any
product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper
packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the
user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for
a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's
total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no
other warranty, whether written or oral, is expressed or implied.
Specifications
General Specifications
Display Multi-function 3 ½ digit (2000 count) LCD display
Measurement
Relative Humidity% (RH) and Temperature (°C & °F)
Data Hold Freezes Display
Datalogger (446580) Records approx. 7000 readings
Data Output 446580: RS 232 PC serial interface
4465CF: Analog 10mvDC per °C/F or %RH
Response Time
Humidity
45% to 95%: ≤ 3 minutes
95% to 45%: ≤ 5 minutes
Measurement rate 4465CF: 2.5 readings per second
446580: 1 reading per second
Operating Temperature
4465CF: 32 to 122°F (0 to 50 °C)
446580: 32 to 104 °F (0 to 40 °C)
Operating Humidity
< 80% RH
Storage Temperature
14 to 140°F (-10 to 60°C)
Storage Humidity
< 70% RH
Power Supply 9V battery
Battery life 4465CF: 400 hours; 446580: 50 hours (approx.)
Weight 4465CF: 7.0 oz. (198 g); 446580: 7.1 oz. (200 g)
Size 10.6 x 2.7 x1.0" (180 x 72 x 32mm)
Measurement Specifications
Range Resolution Accuracy (Full Scale)
% Relative
Humidity
10% to 95% RH 0.1% RH 30 to 95% RH: ±3% RH
10 to 30% RH: ±7% RH
Temperature
4 οF to 140 οF
(20
ο
C to 60
ο
C)
0.1
ο
F/C ±1.5
ο
F (±0.8
ο
C)
Model 446580 Version 2.0 June 2004
3
1
2
3
4
7
8
9
5
6
Meter Description
1. Temperature-Humidity Sensor
2. LCD Display
3. ON/OFF/HOLD switch
4. Temperature units switch ( °C & °F )
5. Temperature/Humidity/Record switch
(RECORD position only on the 446580)
6. RECORD / ERASE button (Model 446580 only)
7. Wet bulb calibration adjustment (for factory use only)
8. Dry bulb calibration adjustment (for factory use only)
9. PC Interface jack (Model 446580) or
Analog output jack (Model 4465CF)
The battery compartment and the tripod mount are located
on the rear of the instrument.
Operation
Getting Started
1. Set the TEMP-%RH switch to the TEMP or %RH position.
2. Move the
oC-o
F switch to the desired temperature unit of measure.
3. Move the ON-OFF-HOLD switch to the ON position. If the display does not switch on
please check that the 9V battery is installed and is fresh.
4. The Humidity and Temperature sensors are contained in the tip of the meter. Mount or
hold the meter in the area to be tested. For convenience, a standard tripod mount is
located at the rear of the meter.
5. Humidity changes take time (3 to 5 minutes) to stabilize. Please allow time for the
display to settle.
6. When the low battery icon flashes on the LCD, replace the 9V battery.
Displayed Readings
The Model 4465CF displays humidity or temperature readings in the center of the LCD
depending upon the position of the TEMP-%RH switch.
The Model 446580
, displays both parameters simultaneously with the primary
measurement in the center of the LCD (large digits) and the secondary measure ment in
the lower right hand side of the LCD (smaller digits). The 446580 also momentarily
displays the Date on power-up (in MM:DD format) on the lo wer left of the LCD. The date
display becomes the clock display (24-hour clock format) after several seconds.
Battery Replacement
The Battery Compartment is located on the lower back of the instrument housing. Slide the
compartment cover off in the direction of the arrow. Replace the 9V battery and secure the
compartment cover.
Data Hold
Set the ON-OFF-HOLD switch to the HOLD position to freeze a displayed reading. The H
icon will switch on. Move the switch to the ON position to continue normal operation (the H
icon will switch off).
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