The HI991001 is a compact, waterproof, portable pH/temperature meter that is supplied complete including a rugged carrying case and a unique titanium body pH electrode that has a built in temperature sensor. The meter features a large LCD that displays for easy viewing of the pH, temperature and status indicators. The operation of the meter is simplified to two buttons. The HI991001 has an exceptional long battery life of 1200 hours of continuous use.
The HI991001 meter features a large multi level LCD screen which displays both pH and temperature readings simultaneously with 0.01 pH resolution and an accuracy of +/-0.05 pH. The LCD screen also has indicators for calibration status and stability, as well as on-screen tutorial messages. The HI991001 has many advanced features that are found in more expensive portable instrumentation including automatic calibration, buffer recognition,and temperature compensation. The battery percent level is displayed at start up alerting the user to the remaining battery power that is available. The supplied HI1296D is a titanium body, amplified pH electrode with a built-in temperature sensor. The titanium body is resistant to many chemicals including those found in plating shops and chemical manufacturing. The matching pin along with the amplifier prevents interference from humidity and electrical noise from common sources including from motors, ballasts, or rectifiers.
Simplified one button calibration
One or two point calibration is automatic to two selectable buffer sets (4.01, 7.01 and 10.01 or 4.01, 6.86, and 9.18). To calibrate simply press and hold the left power/mode button for three seconds and let go once pH 7.01 or pH 6.86 is displayed. Which value is displayed is dependent on the buffer set chosen. The meter is placed in the appropriate buffer. Once the buffer is auto recognized pH 4.01 will then be displayed. For single point calibration the left power/mode button is pressed and the meter will escape to measurement mode. For two point calibration the meter is then placed in the second buffer. The meter will automatically detect the second buffer (i.e. pH 4.01 or pH 9.18/10.01). Once the second buffer is recognized the meter will automatically exit to measuring mode
HI1296D titanium body amplified pH electrode with built in temperature sensor
The HI991001 is supplied with the amplified titanium body pH/temperature electrode. The titanium body is resistant to many aggressive chemicals including those used in plating and chemical manufacturing. The titanium body acts as a matching pin. The matching pin and built in amplifier will reduce the effects of electrical noise on the high impedance pH measurement. Examples of sources of electrical noise include rectifiers, motors and ballasts. The HI1296D pH electrode also features an extractable cloth junction. Every pH electrode has a junction. Many use a single ceramic frit which acts as a barrier between the inside reference cell to the outside sample. This barrier allows for a diffusion electrolyte that is necessary for the pH measurement. Any clogging of the junction will result in a reduced diffusion and as a result the readings will become erratic. Most probes will have to have this junction cleaned and if not possible then the probe has to be replaced. The extractable cloth junction of the HI1296D allows for the renewing of the junction. Simply extract ⅛” of the junction by pulling on the junction will expose a new portion. Any clogging that was present will be cleared and the response time will be back to normal extending the life of the pH electrode.
- Titanium body that is resistant to harsh chemicals
- Pre-amplified and matching pin for resistance to electrical noise
- Extractable cloth junction to clear any clogging
- Built in temperature sensor for automatic temperature compensated readings
- Designed to float if accidentally dropped in a tank
Expanded pH Range
- pH range is from -2.00 to 16.00 pH
Automatic Temperature Compensation
- All readings are compensated for variations in temperature
- Temperature displayed in °C or °F along with pH reading
- Meter displays a clock tag that will disappear when the reading has achieved stability
- Freezes reading on the display to allow recording of measurement
BEPS (Battery Error Prevention System
- Meter will automatically shut off if there is not enough power to get an accurate measurement
Battery % level at startup
Low Battery Indicator
- When the level is below 5%, the battery symbol on the LCD blinks to indicate a low battery condition.