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RH300-en-GB_v1.7   9/16 

6

Maintenance 

Cleaning and storage 

1.  The meter should be cleaned with a damp cloth and mild detergent when necessary. Do not use 

solvents or abrasives. 

2.  Store the meter in an area with moderate temperature and humidity (refer to the operating and 

storage range in the specifications chart earlier in this manual). 

 

Battery Replacement 

When the battery power falls low, the 

 symbol will appear on the LCD. Replace the two (2) 1.5 

‘AAA’ batteries by removing the rear battery compartment cover and accessing the battery 
compartment. Observe correct polarity when placing the batteries in the compartment. Ensure that 
the compartment cover is securely fastened when finished. 
 
 

Never dispose of used batteries or rechargeable batteries in household waste. 
As consumers, users are legally required to take used batteries to appropriate collection 
sites, the retail store where the batteries were purchased, or wherever batteries are sold. 

Disposal: 

Do not dispose of this instrument in household waste. The user is obligated to take end-of-

life devices to a designated collection point for the disposal of electrical and electronic equipment.  
 

Other Battery Safety Reminders 

o

  Never dispose of batteries in a fire. Batteries may explode or leak.

 

o

  Never mix battery types. Always install new batteries of the same type.

 

 

 
 

Error Messages 

An error message will appear on the display if the meter fails an internal diagnostic test. 
1. 

ER1

: Relative Humidity failure. Repair/replacement is necessary. 

2. 

ER2

: Internal temperature failure. Repair/replacement necessary. 

3. 

ER3

: Reference resistance failure. Repair/replacement necessary. 

4. 

ER4

: Internal temperature is out of range. 

5. 

ER5

: External temperature is out of range. 

 
 
 
 

www.

.com

information@itm.com

1.800.561.8187

Summary of Contents for RH300

Page 1: ...USER MANUAL Digital Psychrometer Models RH300 and RH305 kit www com information itm com 1 800 561 8187 ...

Page 2: ...tional probe Data Hold selectable Auto Power Off and MAX MIN Average reading Careful use of this meter will provide years of reliable service Meter Description 1 Humidity Sensor Air Temperature Sensor 2 Triple LCD Display 3 ON OFF button 4 T1 T2 Dew Point T1 button 5 F C select 6 MIN MAX RESET button 7 T2 DP Wet Bulb T2 button 8 HOLD button 9 T2 Probe Jack Note The battery compartment is located o...

Page 3: ...on to turn power on or off The meter will perform a short self test when turned on Taking Air Temperature and Humidity Measurements 1 Hold the probe in the area to be tested 2 Allow adequate time for readings to stabilize 3 The Relative Humidity measurement appears in the top display 4 Pressing the T DP T1 button toggles the lower left display between T1 Air Temperature and DP Dew point measuremen...

Page 4: ...he display is now showing the maximum humidity and temperature readings in memory To exit the MIN MAX mode press the MnMx Reset button again and the MIN and MAX icons disappear To clear the current min max readings in memory press and hold the MnMx Reset button for more than two seconds Data Hold Press the HOLD button momentarily to freeze the displayed reading The HLD icon will appear on the uppe...

Page 5: ...ne hour Press and hold the C F button while powering the unit ON The unit enters calibration mode 32 8 flashes on the display The DP and Wb display areas show DP Wb C 6 Once the 33 calibration is complete the display stops flashing and a constant 32 8 is displayed 7 Allow the meter to remain ON and move it to the 75 salt bottle 8 Allow the meter to remain for one hour in the 75 salt bottle to stab...

Page 6: ...ers users are legally required to take used batteries to appropriate collection sites the retail store where the batteries were purchased or wherever batteries are sold Disposal Do not dispose of this instrument in household waste The user is obligated to take end of life devices to a designated collection point for the disposal of electrical and electronic equipment Other Battery Safety Reminders...

Page 7: ...se Time 60 seconds typical Dew Point 90 4 to 122 0o F 68 to 50o C calculated from RH and Air temperature measurements Wet Bulb 6 88 to 122 0o F 21 6 to 50o C calculated from RH and Air temperature measurements Operating Conditions 20 to 50o C 4 to 122o F 99 RH non condensing Storage Conditions 40 to 85o C 40 to 185o F 99 RH non condensing Power Supply 2 x 1 5V AAA batteries Battery Life Approx 80 ...

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