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pH Meters for the Laboratory Bench

Calibration Check pH Meters

After every calibration, these "cal-check" pH meters display both the condition and the response of the connected electrode. Along with all of the advanced features you expect such as GLP (good laboratory practice), computer ports and more, this is another first from Hanna Instruments.  These cal-check pH meters should be standard laboratory equipment.  This page shows six different pH bench meters with the calibration check feature.  Some have built in printers and Ion Selective Electrode (ISE) reading capabilities.

Key Features:

• Electrode holder included with pH meter
• Log on demand
• Recall logged data
• GLP (Good Laboratory Practice)
• Cal-Check: electrode checking for condition & response
• Calibration Alarm Time out: 1 to 7 days or disabled
• Automatic temperature compensation
• Automatic buffers
• Computer interface (RS-232 optically isolated)
• Warranty: 5 years for laboratory equipment
• Two or three decimal place accuracy
• pH and mV ranges

   

  pH Meters: Bench Models

  HI 110, HI 111, HI 112, HI 113 pH meters

  The continuing innovation of Hanna Instruments pH meters is shown here.  The buttons on the left take you to a whole series of different pH meters designed for a variety of applications.

  The pH meter pictured is model number HI 111 which is one of a number of bench meters manufactured by Hanna Instruments.  Other models both more basic and more sophisticated are shown on other pages (see navigation tabs on left).  MBH Engineering can guide you based upon your requirements for lab equipment.  Detailed specification sheets can be emailed to you showing the exact model needed.

  The model HI 111 features GLP (Good Laboratory Practice) data collection showing: offset, slope, date, time of last calibration.  In addition to calibration at the standard 4, 6.86, 7, 9.18 and 10 buffer values, the user can also calibrate at two more custom defined points.  The unit features ATC, opto-isolated RS-232 output and a mV scale for more measurements.  Accessories not included with this instruments are an electrode holder stand (pictured), PC software and a serial cable as well as buffer, storage and cleaning solutions.  HI 113 has all the same features but with two or three digit measurement of pH as opposed to the the model HI 111 which is limited to pH measurement at 0.01 accuracy.  The models HI 110 and HI 112 are missing the mV scale which can be very helpful in electrode diagnostics.  These instruments can take advantage of Hanna's technical buffers which are available at pH values from 1.00, 2.00, 3.00 etc. to 13.00.  When you need accuracy, Hanna's pH meters and electrodes perform.  Most people are surprised when they find out the Hanna is the largest manufacturer of pH instruments and electrodes in the world.  They continue to innovate in the field of pH measurement and lab equipment.  We are proud to be a representative and stocking distributor for Hanna Instruments for the past fifteen years. 

  HI 250, HI 251, HI 253, HI 254

  Step up to the 250 series pH meters.  This quartet of meters all sport an RS-232 serial port for computer connectivity, automatic memorized buffers and pH range up to 16.00/16.000.  Other standard features include: an electrode stand, refillable glass electrode, temperature sensor and 12Vdc adaptor.  Differences between the models are shown on the table below but can be summarized: HI 250 pH only, HI 251 pH/mV and the higher resolution models: HI 254 pH/mV, HI 253 pH/mV and ISE (ion selective electrode measurement).  The meters look like the 110 series shown above.

  	HI 250	HI 251		HI 253	HI 254
  Resolution	0.01 pH	0.01 pH		0.001 pH	0.001 pH
  Resolution, ORP		0.1mV		0.1mV	0.1mV
  Resolution	0.1ºC	0.1ºC		0.1ºC	0.1ºC
  Resolution				0.001 mg/l
  Calibration	1-3pts	1-3pts		1-3pts	1-5pts
  Calibration				1 or 2 ISE
  Buffers	5 std	5 std		5 std	5 std + 2
  GLP	yes	yes		yes	yes
  ATC	yes	yes		yes	yes

   

Specifications and product details: HI 221 and HI 223

Applications:

• Quality Assurance/ Quality Control Laboratories
• Production Labs
• Food and Beverage Labs
• Breweries
• General purpose pH meter for WWTP

We suggest you read the "white paper" on laboratory equipment reprinted from American Laboratory News "Improvements in pH Measurements."  This technical paper explores the problems which are typical for pH meter measurements.  In particular the paper discusses the reasons pH meters can provide readings which are inaccurate.  pH meter users can be unaware of the issue and then rely on readings which are incorrect.  The article goes on to explain how to overcome these issues.

More Calibration Check pH meters:

The 120 series pH meters from Hanna Instruments also are equipped with the "cal-check" feature.

Datalogging pH Meters with Cal Check^™

HI 120 and HI 121 

                                *  Measure pH, mV, Temp

                                               and Selective Ion (HI 121 only)

*  Calibration Check^™ Feature

*  GLP Compliant

*  Selectable accuracy 0.01 or 0.001pH

When pH measurements need to be performed, the calibration phase is very important. It is often necessary for the user to measure extreme pH values or values far from standard calibration buffers. HI 120 and HI 121 can offer help in these situations, thanks to automatic calibration in up to 5 points. Users can select each point from among the 7 factory stored values and up to 2 more values manually entered for specific applications. Moreover, thanks to Calibration Check^tm, good calibration results can be easily viewed directly on the display with the percentage information regarding pH electrode condition and response. Both pH meters are in compliance with GLP. HI 120 can also perform ORP measurements and the HI 121 adds ion-selective measurement capability as well. Both of these pH meters store data that can be easily downloaded to a PC thanks to an RS232 port and optional HI 92000 software.

HI 120 is supplied complete with HI 1131P pH electrode, HI 7662-T temperature probe, pH 4 and pH 7 buffers, electrolyte solution, 12 Vdc power adapter and instructions. HI 121 is supplied complete with HI 1131P pH electrode, HI 7662-T temperature probe, pH 4 and pH 7 buffers, electrolyte solution, 12 Vdc power adapter and instructions.

pH/Selective Ion Meters with Built in Printer:

HI 122 and HI 123         

• Suited for Many Applications
• Calibration Check^™ Feature
• Built-in Printer
• Up to five calibration points including custom values
• Selective accuracy: 0.01 or 0.001pH

HI 122 and HI 123 are strong additions to the HANNA instruments^® family of professional pH meters. These pH meters offer all the latest features and built-in printer. Besides basic functions, like optional higher resolution and automatic temperature compensation, they are provided with Hanna's Calibration Check^™ system for electrode calibration evaluation. The combination of this option with the ability to calculate a calibration curve in 5 points (from 7 stored plus 2 custom values), make these products suitable for any kind of application, both with neutral pH, and with very alkaline pH values. Both meters adhere to Good Laboratory Practices and can store data and measurements of each calibration to be printed directly or downloaded to a PC through the RS232 port. HI 123 can also measure specific ions directly in ppm. Calibration is still fast and easy, in 1 or 2 points from among 5 standard memorized buffers.

HI 122 is supplied complete with HI 1131P pH electrode, HI 7662-T temperature probe, pH 4 and pH 7 buffers, electrolyte solution, 5 paper rolls, 12 Vdc power adapter and instructions. HI 123 is supplied complete with HI 1131P pH probe, HI 7662-T temperature probe, pH 4 and pH 7 buffers, electrolyte solution, 5 paper rolls, 12 Vdc power adapter and instructions.

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© MBH Engineering Systems 2008
Last modified: 29-Oct-2008