We started upgrading to these, and have found that if you don't have clean water (i.e.. softened ) crud builds up quite rapidly on the sock and it begins to read incorrectly, which greatly affects the wet bulb control.

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Jake

Sorry to hear of your problems with the usually reliable RDM-3. The issue sounds like electrical leakage in the meter or electrode which often can be remedied by cleaning the input connector and contact pins assembly as well as the insulation assembly of the electrode with denatured alcohol or a mild bio-degradable cleaner. If the issue persists, please use the Return Form on our website and return the equipment to us for evaluation and repair. www.delmhorst.com

Feel free to call to discuss further - 877 335 6467 x226
Thank you.
Tom L. 

Kiln Drying Seminar

When:
October 16 @ 8:00 am - October 20 @ 5:00 pm   

Where:
UBC – Centre for Advanced Wood Processing, Vancouver, British Columbia V6T 1Z4 Canada

Essentials of Wood Drying A comprehensive, hands-on introduction to drying technology taught from a practical, real-life perspective and backed with solid explanations into the scientific background of drying. This highly-regarded workshop discusses the key processes and concepts involved in drying wood. Beginning with wood properties and moisture movement, students become familiar with kiln design considerations, drying schedules and kiln loading considerations. Other topics include drying with air, drying degrade, lumber storage and handling, control systems and power plants...[url Kiln Drying Seminar
October 16 @ 8:00 am - October 20 @ 5:00 pm   
UBC – Centre for Advanced Wood Processing, Vancouver, British Columbia V6T 1Z4 Canada + Google Map   

Essentials of Wood Drying A comprehensive, hands-on introduction to drying technology taught from a practical, real-life perspective and backed with solid explanations into the scientific background of drying. This highly-regarded workshop discusses the key processes and concepts involved in drying wood. Beginning with wood properties and moisture movement, students become familiar with kiln design considerations, drying schedules and kiln loading considerations. Other topics include drying with air, drying degrade, lumber storage and handling, control systems and power plants.  Find out more>>

First, let's assume they are both accurate or at least give the same RH value and the difference is in the rate of response.

If the sensor changes, then the valve response needs to change.  This involves changing the PID settings in the controller.  I would recommend asking the manufacturer about this and do not change the values yourself.  There are three numbers for each control loop.  One regulates how much the actuator opens for a certain error. The second integrates the error over time and opens or closes the actuator in response to that value certain.  The last uses how fast the temperature is changing to effect a change in the actuator position.  The kiln control will be a mess if these settings are not correct (overshoot or slow to come back to set point).  "Error is how far the kiln is away from set point.