HI 221 and HI 223 are pH/ORP/Temperature bench meters setting new calibration standards. A deep understanding of the pH calibration process can only come from a manufacturer of instruments as well as electrodes and calibration solutions. Hanna Instruments is one of the few manufacturers in the world to produce meters, electrodes and buffer solutions. Proper calibration of the pH meter and pH electrode system is critical in order to achieve reliable results and Hanna has developed a new system that monitors the two most important parameters during the calibration process, the pH electrode and the buffer solution: Cal-Check™. This new system warns the users in the event the pH electrode is dirty and if the calibration buffer is out of specification (cross contamination). When a pH electrode is not properly cleaned, even the smallest residues of samples left on the sensitive glass can produce slope errors up to a tenth of a pH unit.

A pH buffer solution that has been contaminated can also drift by a few tenths of a pH unit, resulting in erroneous calibration. Dirty pH electrodes and buffer solutions cannot be detected by conventional pH meters, resulting in wrong calibrations and subsequent erroneous pH measurements. Hanna's new pH meters have addressed this problem by displaying on the LCD status symbols that warn the user to clean or replace the pH electrode or to replace the buffer solution with a fresh one. This new calibration concept removes the guesswork, and guarantees the user that the equipment is in the best condition. Both instruments have a "log on demand" function to record 100 (HI 221) or 500 (HI 223) readings, RS232 port for computer connection, automatic or manual temperature compensation (ATC or MTC), and an extended range of 7 memorized calibration buffers. HI 221 offers pH readout of 0.01 pH, and HI 223 has a resolution of 0.001 pH.

RECALL
	Measurements taken with the HI 221 and HI 223 can be stored and recalled at a a later time.

GLP
	The instruments store calibration data. In addition, they can be programmed to give an alert when the instrument requires a new calibration

LOG ON-DEMAND
	Both instruments have a "log on demand" function to record 100 (HI 221) or 500 (HI 223) readings.

CAL-CHECK FEATURES

Electrode offset Electrode slope Electrode reponse time Calibration interval

During calibration, the user is warned if one or more parameters are not suitable to perform a correct calibration

How to Cal-Check works

When a pH electrode is dirty, it has a slow response time and unstable reading. HI 221 and HI 223 warn the user in the event a dirty electrode has been used. HI 221 and HI 223 are able to detec id the calibration buffer solution is contaminated.

SPECIFICATIONS
	HI 221	HI 223
pH Range	-2.00 to 16.00	-2.00 to 16.00 or -2.000 to 16.000
pH Accuracy	±0.01	±0.01; ±0.002
pH Resolution	0.01	0.01; 0.001
mV Range	-699.9 to 699.9; -2000 to 2000	-999.9 to 999.9; -2000 to 2000
mV Accuracy	±0.2; ±1	±0.2 (±699.9); ±0.5 (±999.9); ±1 (±2000)
mV Resolution	0.1, 1	0.1; 1
°C Range	-20.0 to 120.0	-20.0 to 120.0
°C Accuracy	±0.4	±0.4
°C Resolution	0.1	0.1
Temperature Comp.	Manual (MTC) or Automatic (ATC) temperature compensation
pH electrode	HI 1131P glass body, single junction refillable cell, BNC + pin (included)
Temperature probe	HI 7669/2W stainless steel probe (included)
PC Interface	Opto-isolated RS232
Logging	100 points	500 points
Input impedance	1012 ohm
Power	12VDC adapter (included)
Environment	0 to 50°C (32 to 122°F) 95% RH
Dimensions	240 x 182 x 74 mm (9.4 x 7.2 x 2.9”)
Weight	1.1 Kg (2.4 lb.)

COMES COMPLETE WITH

HI 1131P Interchangeable pH electrode BNC plug + PIN 1m calbe HI 7669/2W temperature probe (Stainless steel) HI 76404 electrode holder pH 4.01 and pH 7.01 calibration solutions Electrolyte solution 12V DC adapter and instruction manual

CAT. NO.	DESCRIPTION
HI221	pH/ORP/Temperature Bench Meters Model HI 221
HI223	pH/ORP/Temperature Bench Meters Model HI 223
Accessories
HI7004L	pH 4.01 buffer solution, 500 ml
HI7007L	pH 7.01 buffer solution, 500 ml
HI7010L	pH 10.01 buffer solution, 500 ml
HI77400P	Cal. kit (pH 4 &7, 20ml, 5pcs each)
HI70300L	Electrode storage solution, 460ml
HI7061L	General cleaning solutions, 460ml
HI3131B	Glass body, refillable, Pt ORP electrode
HI92000	Windows compatible software
HI920010	9-pin PC connection cable