Campbell CS526 Manual de usuario

CS526 ISFET pH Probe

Revision: 6/13

Campbell Scientific, Inc.

Warranty

The CS526 ISFET pH Probe is warranted for six (6) months subject to this

limited warranty:

“PRODUCTS MANUFACTURED BY CAMPBELL SCIENTIFIC, INC. are

warranted by Campbell Scientific, Inc. (“Campbell”) to be free from defects in

materials and workmanship under normal use and service for twelve (12)

months from date of shipment unless otherwise specified in the corresponding

Campbell pricelist or product manual. Products not manufactured, but that are

re-sold by Campbell, are warranted only to the limits extended by the original

manufacturer. Batteries, fine-wire thermocouples, desiccant, and other

consumables have no warranty. Campbell's obligation under this warranty is

limited to repairing or replacing (at Campbell's option) defective products,

which shall be the sole and exclusive remedy under this warranty. The

customer shall assume all costs of removing, reinstalling, and shipping

defective products to Campbell. Campbell will return such products by surface

carrier prepaid within the continental United States of America. To all other

locations, Campbell will return such products best way CIP (Port of Entry)

INCOTERM® 2010, prepaid. This warranty shall not apply to any products

which have been subjected to modification, misuse, neglect, improper service,

accidents of nature, or shipping damage. This warranty is in lieu of all other

warranties, expressed or implied. The warranty for installation services

performed by Campbell such as programming to customer specifications,

electrical connections to products manufactured by Campbell, and product

specific training, is part of Campbell’s product warranty. CAMPBELL

EXPRESSLY DISCLAIMS AND EXCLUDES ANY IMPLIED

WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A

PARTICULAR PURPOSE. Campbell is not liable for any special, indirect,

incidental, and/or consequential damages.”

Assistance

Products may not be returned without prior authorization. The following

contact information is for US and international customers residing in countries

served by Campbell Scientific, Inc. directly. Affiliate companies handle

repairs for customers within their territories. Please visit

www.campbellsci.com to determine which Campbell Scientific company serves

your country.

To obtain a Returned Materials Authorization (RMA), contact CAMPBELL

SCIENTIFIC, INC., phone (435) 227-9000. After an applications engineer

determines the nature of the problem, an RMA number will be issued. Please

write this number clearly on the outside of the shipping container. Campbell

Scientific's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____

815 West 1800 North

Logan, Utah 84321-1784

For all returns, the customer must fill out a "Statement of Product Cleanliness

and Decontamination" form and comply with the requirements specified in it.

The form is available from our web site at www.campbellsci.com/repair. A

completed form must be either emailed to repair@campbellsci.com or faxed to

(435) 227-9106. Campbell Scientific is unable to process any returns until we

receive this form. If the form is not received within three days of product

receipt or is incomplete, the product will be returned to the customer at the

customer's expense. Campbell Scientific reserves the right to refuse service on

products that were exposed to contaminants that may cause health or safety

concerns for our employees.

Table of Contents

PDF viewers: These page numbers refer to the printed version of this document. Use the

PDF reader bookmarks tab for links to specific sections.

1. Introduction.................................................................1

2. Cautionary Statements...............................................1

3. Initial Inspection .........................................................2

4. Quickstart ....................................................................2

5. Overview......................................................................3

6. Specifications .............................................................3

7. Installation and Wiring ...............................................4

7.1 Preparation for Use ..............................................................................4

7.2 Wiring ..................................................................................................4

8. Programming ..............................................................5

8.1 Get Data Command..............................................................................5

8.2 CRBasic Programming.........................................................................5

8.2.1 Instruction Sequence.....................................................................5

8.2.2 Instruction Descriptions ................................................................6

8.2.2.1 SerialOpen() Instruction.....................................................6

8.2.2.2 SerialOut() Instruction........................................................6

8.2.2.3 SerialIn() Instruction ..........................................................6

8.2.2.4 SplitStr() Instruction...........................................................7

8.2.3 Example Program..........................................................................7

8.2.4 Programming for Calibration ........................................................7

9. Calibration ...................................................................8

10. Troubleshooting..........................................................8

11. Maintenance ................................................................9

11.1 Cleaning ...............................................................................................9

11.1.1 When to Clean...............................................................................9

Table of Contents

11.1.2 Cleaning Procedure .................................................................... 10

11.1.2.1 Cleaning Tips................................................................... 10

11.1.3 Revitalizing ................................................................................ 11

11.2 Storage............................................................................................... 11

11.2.1 Short-Term Storage (2 days or less)........................................... 11

11.2.2 Long-Term Storage (more than 2 days) ..................................... 11

Appendix

A. Calibration ...............................................................A-1

A.1 Example Calibration Program ......................................................... A-2

Figures

11-1. Tip of the CS526 probe ..................................................................... 10

Tables

7-1. CR800, CR850, CR1000, and CR3000 Wiring................................... 4

8-1. “Get Data” Command and Response................................................... 5

8-2. Instruction Sequence ........................................................................... 5

9-1. Calibration Standards .......................................................................... 8

CS526 ISFET pH Probe

1. Introduction

The CS526 ISFET pH Probe measures pH from 1 to 14 in aqueous or semi-

solid solutions. It outputs TTL serial data that is read by compatible

dataloggers (see Section 6, Specifications).

Before using the CS526, please study

•Section 2, Cautionary Statements

•Section 3, Initial Inspection

•Section 4, Quickstart

More detailed instructions for operation, troubleshooting, and maintenance are

available in the remaining sections.

2. Cautionary Statements

•Campbell Scientific warranty does not cover a clogged reference diaphragm or

improperly cleaned or maintained ISFET chip (see Section 11, Maintenance).

•Maximum input voltage is 5 Vdc. Incorrect wiring may cause performance

loss and irreversible damage.

•To prevent scratching the sensor chip when cleaning, first soak the sensor in

soapy water and then gently scrub with a toothbrush (see Section 11,

Maintenance). Most scratches occur when hard particles are rubbed on the

chip surface. Scratches cause irreversible damage to the probe.

•Do not use hydrofluoric acid, acetone, MEK, or similar agents to clean the

probe.

•Cable can be damaged by abrasion, rodents, sharp objects, twisting, crimping

or crushing, and pulling. Take care during installation and use to avoid cable

damage.

•The CS526 is rugged, but it should be handled as a precision scientific

instrument.

•The CS526 has no user-serviceable parts. Any attempt to disassemble the

device will void the six-month warranty.

•Care should be taken when opening the shipping package to not damage or cut

the cable jacket. If damage to the cable is suspected, consult with a Campbell

Scientific applications engineer.

CS526 ISFET pH Probe

3. Initial Inspection

Upon receipt of the CS526, inspect the packaging and contents for damage.

File damage claims with the shipping company.

The model number and cable length are printed on a label at the connection end

of the cable. Check this information against the shipping documents to ensure

the correct product and cable length are received.

4. Quickstart

For complete installation, programming, and calibration information, see

Sections 7through 9.

The CS526 is shipped dry. Before the probe can be calibrated, it must be

soaked in 7-pH buffer solution for 15 minutes. Follow the calibration

procedure outlined in Appendix A, Calibration.

Unlike many glass-bulb type pH sensors, the CS526 ISFET pH probe can be

installed without regard to orientation. Connect the CS526 to the datalogger

according to the following table. Be sure to connect Red to the 5V channel.

Wire Color Datalogger Connection

Red (Caution! 5 Vdc max!) 5V

Black G

White Control Port (Tx)

Green Control Port (Rx)

Clear G

Program the datalogger as follows.

'CR1000 Series Datalogger

'Declare variable for digital pH measurement

Public pHCount

'Declare variables for serial input from sensor

Dim rawstring As String * 20, pHDigit(2)

'Main Program

BeginProg

'Set up datalogger port for serial communication

SerialOpen ( Com1,2400,16,0,41)

'Establish program scan rate of 60 seconds

Scan (60,Sec,0,0)

'Send get data command to CS526

SerialOut (Com1,"1M1!"&CHR(13),"",0,0)

'Set up COM1 to receive incoming serial data.

'Set timeout to maximum 200 mS

SerialIn (rawstring,Com1,20,0,20)

CS526 ISFET pH Probe

'Split out digital count value for pH from string input

SplitStr (pHDigit(),rawstring,"String",2,0)

pHCount = pHDigit(2)

NextScan

EndProg

5. Overview

The submersible CS526 is designed to reliably provide accurate pH

measurements over the specified operating temperature range. The pH-

sensitive element is SENTRON’s Ion Sensitive Field Effect Transistor (ISFET)

semi-conductor, which includes a silver / silver chloride – potassium chloride

reference system. This technology is one of the most significant breakthroughs

in pH testing in half a century and is considered one of the most robust pH

testing technologies available today.

The CS526 is suitable for demanding applications in laboratory and field. The

ISFET performs well in solutions with high solids, moderately aggressive

chemicals, and biological materials. Clogging and junction-contaminating

conditions are well tolerated. See Section 11, Maintenance, for cleaning

procedures.

CS526 electronics are embedded in durable PEEK material, which makes up

the sensor body. The absence of a glass electrode eliminates the potential

hazard of broken glass. The ISFET design considerably reduces the number of

acidic or alkaline errors in extreme pH conditions.

6. Specifications

Features:

•Safety —the ISFET with durable PEEK material can be used safely

in applications where broken glass is a hazard to the user.

•Intelligent electronics —the CS526 combines the latest

developments in ISFET pH sensing technology with state-of-the-art

signal processing. This allows for accurate, fast and reliable results.

•Quality —designed and manufactured under stringent quality control

conditions in an ISO 9001 environment. Each sensor is individually

tested to the most demanding testing protocols, and the electronics

comply fully with directives and with EMC standard

IEC61326:2005.

Compatibility: CR800-series, CR1000, CR3000 dataloggers

Measurement

Range: 1 to 14 pH

Accuracy: ±0.2 pH with 2-point calibration

24 hr drift: <0.15 pH (after 15-min soak in pH 7 at 25°C)

CS526 ISFET pH Probe

Operating

Temperature: 10° to 40°C

Water Pressure: 0 to 700 kPa (0 to 101.5 psi)

Power Requirement

Source: 5 Vdc

Load: 15 mA maximum

Output: TTL logic, 2400 bps

8 data bits, no parity, 1 stop bit

Maximum Cable Length: 100 m (328 ft)

Cable Type: Three-twisted pair, 24-AWG cable with

Santoprene®jacket

Sensor Material: PEEK

Weight

w/10-ft cable: 318 g (11.2 oz)

Dimensions

Length: 102 mm (4 in)

Diameter: 16 mm (0.63 in)

Certifications: ISO 9001

compliant

EMC standard IEC61326:2005

7. Installation and Wiring

7.1 Preparation for Use

The CS526 is shipped dry. Before the probe can be calibrated, soak it in 7-pH

buffer solution for 15 minutes. Unlike many glass-bulb type pH sensors, the

CS526 ISFET pH probe can be installed without regard to orientation.

7.2 Wiring

TABLE 7-1. CR800, CR850, CR1000, and CR3000 Wiring

Wire Color Wire Label/Function Datalogger Connections

Red (see following

caution)

Power 5V 5V

Black Ground G

White Signal #1 (Rx) Control Port (Tx)

Green Signal #2 (Tx) Control Port (Rx)

Clear Shield G

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