PH220A datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > PH220A

Preview

PH220A: DescriptionWaterproof Palm pH Meter; File Size110KB，9 Pages; ManufacturerExtech; Websitehttp://www.extech.com/

Download Datasheet View All

PH220A Overview

Waterproof Palm pH Meter

Preview

Download Datasheet

View All

User Guide

Waterproof Palm pH Meter

Model PH220A

7.00

Introduction

Congratulations on your purchase of the Extech PH220 waterproof pH/mV meter. This

microprocessor-based device with tactile push-buttons is battery operated and ideal for

field use. The PH220 simultaneously displays pH and temperature. The rubber holster

which protects the meter has a magnetic backing for convenient mounting. The built-in

memory (25 readings) allows STORE, RECALL, and CLEAR functionality. Careful use of

this meter will provide years of reliable service.

Calibration (pH only)

The sensitivity of a pH electrode degrades over time, it is very important to frequently

calibrate the meter to the electrode. pH electrodes can be thought of as batteries in that

they run down with time and use.

Calibration is performed using standard buffer solutions at room temperature (78°F, 25°C).

Buffer solutions are solutions of a known pH that have the useful property of resisting

changes in pH. These can be purchased already mixed or in capsule form and are usually

available in three pH values, pH 4.00, pH 7.00 and pH 10.00.

Calibration is always performed using the pH 7.00 buffer first, followed by a second

calibration. Select pH 4 buffer for the second calibration if typical measurements will be

less than pH7 or use a pH 10 buffer if typical measurements will be greater than ph 7.

In order to obtain the most accurate results possible, a pH meter should be

calibrated at least once each day. Note that the mV (ORP) function does not require

calibration.

pH Calibration Procedure

1. Place the electrode into a 7.00 pH buffer solution. Press and hold the

CAL

button until

“CAL” appears in the display.

2. The instrument automatically recognizes the solution and calibrates to that value.

Note that if the solution is off by more than 1 pH unit from the 4, 7, or 10 pH buffer, or

if the electrode slope is low, the instrument will assume an error and abort the

calibration (End will be displayed, and the unit will return to the normal measurement

mode.)

3. During calibration, the pH reading flashes on the main display.

4. When calibration is complete, the instrument automatically displays ‘SA’ followed by

‘End’ and then returns to the normal operation mode.

5. For a two or three point calibration, repeat steps 1-4. When doing a 2 or 3 point

calibration, calibrate with pH 7 buffer first, then follow with pH 4 and/or pH 10.

CAL Reminder Display

When in pH measurement mode, the CAL icon will appear if a calibration has not been

performed after 15 on/off cycles of the instrument. The CAL display is simply a reminder

and will turn off when the pH electrode is recalibrated. The reminder does not affect

function in any way.

Model PH220 Version 3.1 11/2005

Recommended Resources

Current negative feedback bias circuit

CMOS555 oscillator circuit diagram that generates a full square wave

Shuanghua JDB-LQ-TQ/Z full voltage starting circuit

Circuit diagram c for CB950 control terminal application

7805 voltage regulator circuit diagram

A long-distance FM transmitter circuit (500M)

Pay attention when drawing and punching PCB!!: I drew a few PCBs some time ago, and some of the board connectors needed to have mounting holes drilled.I have been using the AD14 version of the software before, and I changed my computer after the s...; 燕园技术宅 PCB Design

How to emulate when using external extended program memory?: The 89s52 chip is connected to a w27c512 EPROM as an external program memory and the program is burned into the EPROM. In this case, how should the emulator be used for simulation?...; wangxzok Embedded System

Introduction to Multithreaded Programming in Embedded Systems: Dr. Piotr Romaniuk explains multithreaded programming....; SensorYoung Programming Basics

Regarding the output time of 149: #include "msp430x14x.h" void main(void) { unsigned int i; WDTCTL=WDTPW+WDTHOLD; P5DIR|=0x10; P5SEL=0x10; BCSCTL1&=~XT2OFF; do { IFG1&=~OFIFG; for(i=0xFF;i>0;i--); } while((IFG1&OFIFG)!=0); BCSCTL2|=SE...; wangfei890912 Microcontroller MCU

After burning the kernel and booting up, an error code appears. Please help analyze it.: WinCE NAND Boot v1.00 (nboot1st) Jun 29 2007 16:33:48 In loadboot WinCE NAND Boot v1.00 (nboot2nd) Jun 29 2007 16:36:41 Total Sectors:0x0000e800 Sector addr on NAND: 0x000004a0 TotalSector: 0x0000e800...; liaoyi518 Embedded System

VMI VM1448 0217: I want to ask if there is any information about such a film. I have been looking for it for a whole day but I can't find it. I don't even know what it is used for! I want to use MAX1448 instead, but I...; zyandll123 Embedded System

Shortcut: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF BG BH BI BJ BK BL BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF CG CH CI CJ CK CL CM CN CO CP CQ CR CS CT CU CV CW CX CY CZ D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF DG DH DI DJ DK DL DM DN DO DP DQ DR DS DT DU DV DW DX DZ

Popular Components