Extech Instruments RH520A User Manual

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9. Press VIEW at any time to return to the Standard View without saving the changes
SETTING THE RH ALARM LIMITS
1. Press the SET, RH, and ALARM buttons simultaneously from the Standard View
2. The ALARM, SET, and MAX indicators will switch on. All of the TEMP indicators will switch off
3. Use the UP-DOWN arrow buttons to increment/decrement the HIGH RH alarm limit. Use the
LEFT-RIGHT arrow buttons to step through the decades
4. Press the ALARM button. The MIN (low alarm) indicator will switch on
5. Use the UP-DOWN arrow buttons to increment/decrement the LOW RH alarm limit. Use the
LEFT-RIGHT arrow buttons to step through the decades
6. The HIGH and LOW alarm limits cannot overlap
7. Use the ALARM button to toggle between the HIGH and the LOW alarm limits
8. Press the SET button at any time to save changes and return to the Standard View
9. Press VIEW at any time to return to the Standard View without saving the changes

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