EC500 V2.3 3/08

13

Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: repair@extech.com

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Troubleshooting

Problem

Possible Cause

Action

Reading is frozen

Unit is in “HOLD” mode

Press MODE/HOLD key to

exit “HOLD” mode

“BAT” message

Batteries are low

Replace batteries

Unit will not calibrate in pH

Low pH slope

Replace electrode, see

reorder information

Unit will not calibrate in pH

Clogged or contaminated

reference junction

Clean junction (see

cleaning instructions)

Unit will not calibrate in pH

Damaged or worn out

sensing membrane

Replace electrode, see

reorder information

Unit will not calibrate in pH

Contaminated pH buffers

Use fresh buffers

Unit will not calibrate in

conductivity mode

Contaminated conductivity

standards

Use fresh standards

Unit will not calibrate in

conductivity mode

Dirty probe

Clean conductivity probe

(See cleaning instructions)

Unit will not calibrate in

conductivity mode

Damaged conductivity probe

Replace electrode, see

reorder information

Unit will not calibrate in

conductivity mode

Trapped air bubbles

Tap or stir to release air

bubbles

Unit will not turn on

Batteries are low or dead

Replace batteries

Unit will not turn on

Batteries installed with

incorrect polarity

Replace batteries,

observe polarity

“RENEW” message

pH sensor needs

recalibration

Recalibrate unit

Use fresh buffers

“RENEW” message

pH sensor slope has fallen

below acceptable limits

Replace electrode, see

reorder information

Unit will not respond to any

key presses

Internal fault

Perform hard reboot:

Remove batteries, hold

ON/OFF switch down for 5

seconds, replace batteries

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