Extech Instruments RH520A User Manual

6 RH520A-en-GB_v4.8 6/19
KEYPAD QUICK REFERENCE (ALSO SHOWN ON REAR OF THE RH520A HOUSING)
Key-press
Function
Second / Alternate Keystrokes
VIEW
Selects view mode
VIEW modes: Normal, TEMPmax,
RHmax, TEMPmin, RHmin
SET
Saves new settings
VIEW to cancel, exit mode
ARROW KEYS
Scroll through selections
Movers cursor through stored
points
TIME
View reading at specific
time/date
Arrow keys to select, VIEW to
exit
TEMP + RH
View Dew Point temp.
VIEW to exit
ALARM
Step back through ALARM
points
ALARM selects next Alarm, VIEW
to exit
SET + TEMP +
ALARM
Enters Set TEMP Alarm mode
ALARM selects HIGH/LOW, SET to
save
SET + RH + ALARM
Enters Set RH Alarm mode
ALARM selects HIGH/LOW, SET to
save
TIME + VIEW
View Sample Rate
VIEW to exit
SET + TIME + VIEW
Enter Set Sample Rate mode
SET to save, VIEW to exit
SET + TIME
Enter Set Time/Date mode
SET to save, VIEW to exit
SET + TEMP + UP
Enter Set TEMP Vertical Scale
mode
TEMP selects upper/lower, SET to
save
SET + RH + UP
Enter Set RH Vertical Scale
mode
RH selects upper/lower, SET to
save

Extech Instruments RH520A Specifications

Temperature and Humidity

temperature range	-28 to 60 °C
temperature accuracy	±1.0 °C
humidity range	10 to 95 %
humidity accuracy	±3.0 % RH
dew point temperature	-28 to 60 °C

Power

power supply	Three ‘AA’ batteries and AC adaptor
dc voltage	5 V
battery life	4 weeks typical

Operating Environment

operating temperature range (control module and display)	0 to 50 °C
operating temperature range (sensor)	-28 to 60 °C
operating humidity (control module and display)	90 % RH max.

Memory and Data Logging

internal memory storage	49, 152 complete reading sets
sampling interval	0.1 to 199.9 minutes
alarm output current	3.4 mA @ 5 VDC

Weight and Dimensions

weight	357 g
dimensions	127 x 196 x 23 mm