Maintenance; Battery Replacement; Probe Replacement - Extech Instruments RD200 User Manual

Maintenance

Cleaning
1. Wipe the meter housing with a damp, soft cloth. Use only mild soap and water.
2. Never use organic solvents to clean the meter (such as thinner, benzene, etc.) as they can
damage the sensor.
3. Clean the sensor area with a dry cloth or use compressed air to clear away debris.

Battery Replacement

When the low battery LED (4) glows red, the 9V battery must be replaced.
1. The battery compartment is located on the rear of the meter. To access the battery
compartment, carefully remove the meter's protective rubber jacket.
2. Remove the Phillips head screw to open the battery compartment.
3. Replace the 9V battery observing correct polarity.
4. Secure the battery compartment and replace the protective jacket before operating the
meter.
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.
Checking the Probe Condition with the Test Solution
The test bottle provided contains an ethanol solution that emits a gas when the bottle is
opened. If the sensor is in good condition, it will detect the gas and the meter will provide
audible and visual alerts. If alerts do not occur, the sensor should be replaced immediately.
Always tightly seal and safely store the test bottle when not in use.

Probe Replacement

The sensor (7) is located at the tip of the gooseneck probe (1), in the cavity underneath the
removable protective collar (6).
The sensor plugs into a 3-conductor connector, in a specific orientation where the black wire, on
the connector, aligns with the black 'dot' on the sensor. The steps below outline the
replacement procedure:
1. Switch the meter OFF.
2. Unscrew the probe tip collar (6) in a counter-clockwise direction and remove the collar.
3. Remove the existing diode sensor (7) by carefully gripping it with a small pliers, or similar
tool, and gently pulling the sensor out of the cavity until the sensor's connector is exposed.
Use caution to avoid damaging the wires to the connector.
4. Disconnect the existing sensor from the 3-conductor connector observing the correct
orientation (black wire on connector aligns with black 'dot' on sensor).
5. Replace the sensor in the proper orientation and re-attach the protective collar.
6. Do not switch the meter ON until the sensor and collar are securely in place.
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