If no sensor is installed or the installed sensor is faulty when the unit is turned on, an alarm will sound and the unit will turn off.

Automatic zeroing on the instrument allows for convenient pinpointing of a refrigerant leak by setting a new 'zero-value' every 3-4 seconds. This is useful when a large concentration of refrigerant is being detected in a contained area. Manual zeroing puts the control of the zero function in your hands, you can simply press the zero button on the tool at any time to set a new zero value. This is good for clarifying the leak source once it has been identified.

Set the sensitivity level by pressing the Sensitivity button. Low (L), medium (M), or high (H) sensitivity will be indicated at the top of the LCD display. The higher the concentration of refrigerant in the ambient air, the lower the sensitivity setting should be to minimize false trips.

The DR58 uses a heated diode sensor. The heated diode’s advantage is that it detects absolute concentration levels so it can be held on a leak and will continue to beep. It is also initially very sensitive. Its disadvantage is that the sensor becomes less sensitive over life, eventually needing replacement. The DR82 uses an infrared (IR) sensor. It detects a change in concentration, so the wand must keep moving. The advantage of the Fieldpiece IR sensor and its sensitivity is that it will last the lifetime of the instrument.

First you need to order a new replacement sensor "RHD1". To replace the sensor, make sure the unit is turned off. Unscrew the wand on the DR58 and gently pull the sensor from the base. Now you can install the new sensor and put it back together.