Stability
To aid with measurement and calibration, your meter has a unique feature that provides an obvious visual indication when the reading becomes stable. If the Stability feature is enabled, the digits on the primary reading will be faded when unstable, becoming solid when stable. If this feature is disabled, the primary reading will always be solid. The image below on the left is an unstable reading during pH Measurement mode with Stability enabled. The image on the right shows a stable reading.
Stability Criteria
The 2700 allows adjustment of the Stable indicator which relates to how fast and frequent it appears. There are three levels of adjustment; SLOW, MEDIUM, & FAST.
To display a ‘Stable’ reading more quickly and more often, use “FAST” setting. MEDIUM or SLOW is recommended for most applications. When Auto Read is enabled, a stability criteria setting of “SLOW” is recommended to for best results.
SLOW: The Stable indicator will take longer to appear and will appear less frequently. Use this setting if you want the best results and don’t mind waiting longer to get them.
MEDIUM: This is the factory default setting. It provides a balanced response which works best for most applications.
FAST: The Stable indicator will appear quickest of any setting. If you find that the Stable indicator frequently appears and disappears, you may want to select a slower setting. This setting is not recommended when AUTO READ is enabled. It is also not suitable for most non-refillable electrodes which are generally slower to respond.
Auto Read
If AUTO READ is enabled, the measured value will automatically lock when the Stable indicator appears. A flashing “AR” icon confirms this condition. To resume a live reading again, it is necessary to press MEAS each time Stable appears. Disable this feature to continuously view the active reading.
Backlight
Select “PERMANENTLY ON” on to keep the backlight on at all times that the meter is powered on. This will offer the best visibility but consumes the most power.
Select “ON WITH KEY PRESS” to turn on the backlight for a specified time after any key press.
Select “0” to keep the backlight off at all times that the meter is powered on.
Data Log (Storing Data To Internal Memory)
Select “SINGLE” to manually save one point at a time. Press the “MEM IN” function key any time during measurement to save data.
Select “TIMED” to automatically save data at selectable intervals - ranging from 3 to 3600 seconds. Data will be collected until the data limit is reached or until “SINGLE” data log is selected. This feature is useful for gathering data from a single sample over time. Note that “MEM IN” is not available during TIMED setting. As data is collected, the display will indicate how much memory has been used.
To view stored data, use “MEM OUT”. Note: the more data that has been acquired memory, the longer the data will take to display.
Print Setup
Adjust the RS-232 output settings for baud rate, parity, data bit, and stop bit to match your printer or computer settings as necessary.
Print Format
When utilizing the RS-232 output; choose “TEXT/PRINTER” option to send the data in an easily viewable format - best for printing.
Choose “CYBERCOMM” option to send the data as a comma separated value (CSV) - best for exporting data into spreadsheet software.
Print Set
This is identical to the Data log function, but data is sent via RS-232 output instead of internal memory.
Select “SINGLE” to manually output one value at a time - best for printing or collecting data to your PC from many samples.
Select “TIMED” to automatically output live data at selectable intervals - ranging from 3 to 3600 seconds. Data will be output until “SINGLE” Print set is selected. This feature is most useful for gathering data for use with software. Unlike the Data Log setting, data can be saved to memory using “MEM IN” during TIMED setting.
Date & Time
Setting the correct date and time is required for GLP and will apply to power off, measurement, data log, and print functions. Instrument has battery backup to retain date/time settings upon power loss. Factory reset will not apply to date and time setting once it has been set. Changes related to daylight savings time must be manually entered.
- Date Format : Select (MM DD YY) or (DD MM YY)
- Time Format : Select 12 Hrs (AM/PM) or 24 Hrs
Password
Select “ENABLE” to restrict access to Calibration and Setup modes. When password protection is enabled, password entry is required before performing any calibration, or making changes to the setup mode. Setup parameters can be viewed, but can not be changed without correct password entry. The password is a user selectable number from 1 to 99999.
Select “DISABLE” if password protection is not desired.
The meter does not allow you to edit setup parameters or perform a new calibration unless you enter the correct password. If an incorrect password is entered 3 consecutive times, the meter returns to measurement mode.
In the event the password can not be recovered, a password can be provided via a written request to Eutech Instruments/Oakton Instruments. The instrument serial number and your contact information are required.
Clear Datalog
Select “YES” to delete all saved data that was manually or automatically stored into memory. This step is most commonly required when the “TIMED” data log interval is not turned off and as a result, fills the memory to capacity. When the memory is full, deleting the saved data is required in order to save additional data. The 2700 will never erase old data in favor of new data when the memory is full.
If you wish to view, print or send the saved data to a PC before deleting, use the “MEM OUT” function from measurement mode.
Factory Reset
Select “YES” to reset the 2700 to the factory default settings except; Date & Time, Temperature calibration, and data stored in memory.
Contrast Adjustment
Optimize the contrast setting of your 2700 display for best visibility in your surrounding lighting conditions. Test various contrast settings for best results. This setting will be applied to both backlight and non-backlight conditions.
pH CALIBRATION GUIDE
pH Calibration (Using Custom Buffers)
Follow same procedure as below - differences are: 2 point minimum calibration is required, the primary display in cal mode is manually adjusted to the desired custom buffer value, and any pH value can be used in any order - but must be at least 1.0 pH unit apart from one another.