SMART 2 Meter Troubleshooting Guide

Power Problems

If your colorimeter does not turn on, press and hold the ON button for two full seconds, then release the ON button. The sensitivity of the keypad is a little different from some other LaMotte meters and requires that you make contact with the ON button a split second longer than may be expected.

If using an AC adapter, make sure that the adapter meets the power requirements as outlined on the bottom label of the meter. LaMotte offers the AC adapter as an optional accessory, code number 1731-110 and 1754 for EX2 versions. If the meter doesn’t turn on when powered by the AC adapter, make sure that the power outlet is in safe, work- ing condition. For best results, remove the battery from the meter when operating with the AC adapt- er. A low battery may interfere with the way that the meter draws current from the AC adapter.

For field use, be sure to use brand name 9V alkaline batteries. Heavy Duty, Rayovac and store brand batteries do not have enough sustained power. We suggest Duracell Alkaline 9V batteries. Rechargeable batteries can be used; we suggest Duracell or Energizer 9V NiMH rechargeable batteries.

If there is any visible damage to the battery connector, contact LaMotte Technical Services for a Return Authorization Number and to make arrangements to have your meter repaired. Any un-authorized alterations to the meter will void the warranty.

Power Save Feature

The colorimeter has a power saving function that turns the meter off after an interval of inactivity. If no buttons have been pressed during that interval, the meter will turn itself off. The default setting is five minutes. Some tests require the meter to be on for longer than 5 minutes. You can change the power save feature to 15, 30 or 60 minutes or dis- able the feature altogether. See “Setting the Power Saving Function” on page 49 of the instruction manual.


Clean the exterior housing with a damp, lint-free cloth. DO NOT ALLOW WATER TO ENTER THE LIGHT CHAMBER OR ANY OTHER PARTS OF THE METER.

To clean the light chamber and optic lenses, point can of compressed air into the light chamber and blow the pressurized air into the chamber. Use a Q-tip dampened with Windex window cleaner to gently swab the LED and Photodiode lenses inside the light chamber. There are a total of eight lenses inside the light chamber, four LED’s and four photodiodes. It is safe to clean each of them, by gently swabbing with the Q-tip and Windex. Do not use alcohol; it will leave a thin film/residue on the optics.

See “Colorimeter Tubes” for instructions on how to clean the test tubes.

Colorimeter Tubes

Colorimeter tubes that have been scratched through excessive use should be discarded and replaced with new ones (LaMotte code 0290-6). Dirty tubes should be cleaned on both the inside and outside. A mild detergent can be used to remove dirt and fingerprints. Alconox and Liquinox are mild, non-toxic biodegradable cleaning com- pounds.

When testing, be sure to fill the colorimeter tube to the 10mL fill line and align the bottom of the con- cave meniscus of the sample with the upper most point of the fill line. Be sure to index the tube in the light chamber, meaning to insert the test tubes into the light chamber with the same orientation each time. On the test tube there is a white index- ing line that extends 90° from the horizontal fill line as a reference. Align this reference line with the arrow at the lip of the light chamber.

Reagent Blanks

Some tests will provide greater accuracy if a reagent blank is determined to compensate for any color or turbidity resulting from the reagents themselves. A reagent blank is performed by running the test procedure on 10mL of demineralized water. Use sample water to Scan the Blank. Insert the reagent blank in the colorimeter chamber and Scan Sample. Note result of reagent blank. Per- form tests on the sample water as described in the test procedure. Subtract results of reagent blank from all subsequent test results. NOTE: some tests require a reagent blank to be used to Scan the Sample.

Blank? Error

If the message “Blank?” is displayed when scanning a sample, this indicates that the sample had a lower reading than the blank. Review the test procedure to determine whether a reagent blank is required. Visually check for color development in the reacted sample. Repeat test if necessary. In rare occasions, the inherent color or turbidity of the sample may be diminished by the addition of an acid reagent in the buffering step of a test procedure. This may clear up the sample so that it appears lower than the blank value. Perform the test again on a diluted sample as outlined on page 16 of the manual.

Over Range Error

The sample may be over range or under range. If the sample is over range the sample should be diluted and tested again. See “Sample Dilution Techniques and Volumetric Measurements” on page 16 of the instruction manual.


The Smart 2 Colorimeter tests have been pre-calibrated. Recalibration of the pre-programmed tests is not possible. HOWEVER, a procedure to standardize the calibration can be performed to obtain the most accurate readings & to meet regulatory requirements. See page 31 of the instruction manual “Calibrating Pre-Programmed Tests”.

Editing Test Sequences & User Tests

The user can edit three different test sequences and enter user tests.