www.zicotech.com
INSTRUCTION MANUAL
Hygro -Thermometer
ZI-7840
Introduction
This device measures relative humidity, air temperature (with probe), plus “K” type thermocouple wide
temperature measurements. The large, easy-to-read backlit LCD includes primary and secondary displays plus
numerous status indicators. Careful use of this meter will provide years of reliable service.
Features
Semiconductor sensor for temperature measurements of 0
℃
to 40
℃
and 32
℉
~104
℉
plus type-K
thermocouple wide temperature measurements of
–20.0
℃
to 1000
℃
and
–4.0
℉
~1832
℉
Humidity measurement from 0.1%RH to 100.0%RH with 0.1%RH resolution and fast time response. (The
measuring range is from 0% to 100%, but above 98% and below 5% the deviation is not specified.)
Fast response for Humidity measurement
Data Hold and MAX Hold function
Large dual digital LCD display with function indication
Specifications
Display:
Dual LCD with Backlight and status Indicators
Sensor Type:
①
Humidity: Precision capacitance sensor
②
Temperature: Thermistor (probe) and type “K” thermocouple
Response Time:
Probe Temperature and Relative Humidity: 3 minutes
Accuracy note
: Accuracy is specified for the following ambient temperature range:
64 to 82°F (18 to 28°C)
Sampling Rate :
2.5 samples per second
Operating Conditions:
32 to 122
o
F (0 to 50
o
C); < 80% RH non-condensing
Storage Conditions
: 14 to 140
o
F (-10 to 60
o
C); <80% RH non-condensing
Power Supply:
9V Battery with auto power off (after 10 minutes)
Dimensions / Weight
: 5.9 x 2.8 x 1.4” (150 x 72 x 35mm); (210g)
Function
Range and Resolution
Accuracy
Humidity
5.0 to 98.0% RH
± 3.5% RH
Temperature
(K-type)
(probe accuracy not
included)
-20.0 to 199.9
o
C
(3.0% r 4
o
C)
-20 to 1000
o
C
-4.0 to 199.9
o
F
(3.0% r 7
o
F)
-4 to 1832
o
F
