Campbell CS525 Manual de usuario

CS525 ISFET pH Probe

Revision: 10/11

Campbell Scientific, Inc.

Warranty

The CS525 ISFET pH Probe is warranted for a period of 6 months subject to

the provisions of the following general 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 product manual. 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 Campbell

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) 227-2342. 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) 227-9579. 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.

CS525 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

1.1 Initial Inspection and Handling Guidelines ..............................................2

2. Specifications ..............................................................2

3. Installation and Wiring ................................................3

3.1 Preparation for Use ...................................................................................3

3.2 Wiring.......................................................................................................3

4. Programming ...............................................................4

4.1 Using SCWIN for CR800, CR850, CR1000, and CR3000 ......................4

4.2 Using CRBasic .........................................................................................4

4.2.1 Simple Program ..............................................................................4

4.2.1.1 CR200(X) Programming .......................................................4

4.2.1.2 CR800, CR850, CR1000, and CR3000 Programming..........5

4.2.2 Programming for calibration...........................................................6

5. Calibration ....................................................................6

6. Maintenance .................................................................6

6.1 Cleaning....................................................................................................7

7. Troubleshooting ..........................................................8

Appendix

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

Figure

6-1. Tip of the CS525 Probe ...........................................................................7

Tables

3-1. CR800, CR850, CR1000, and CR3000 Wiring.......................................3

3-2. CR200(X) Series Wiring.........................................................................4

CS525 ISFET pH Probe

The CS525 probe is designed for general pH measurements in aqueous or semi-solid

solutions. It provides a 0 to 5 Vdc output that represents a 0 to 14 pH range.

The CS525-L ISFET pH Sensor is highly susceptible to

ground looping and galvanic conditions. In many cases

this can be isolated by NOT grounding the datalogger to an

earth ground. However, the most successful isolation

technique to overcome these issues is to use the CWS900

Wireless Sensor Interface. Please discuss the application

with a CSI applications engineer before purchasing the

sensor.

CAUTION

1. Introduction

The submersible CS525 is designed to provide a rugged, reliable, accurate pH

measurement that is fully temperature compensated.

The pH-sensitive element in the CS525 is SENTRON's high-tech Ion Sensitive

Field Effect Transistor (ISFET) semi-conductor and includes a

silver/silverchloride - potassium chloride reference system. This technology is

the most significant breakthrough in pH testing in half a century and is the

most powerful pH testing technology available today.

The ISFET proves its power under demanding circumstances where high

solids, more aggressive chemicals or biological materials are present and

clogging or junction contamination may occur. The probe is easily cleaned

using a simple toothbrush.

The CS525 electronics are safely embedded in the sensor body which is made

of durable PEEK material. Due to the elimination of the glass-bulb, the

possibility of broken glass is eliminated. The ISFET design considerably

reduces the number of acidic or alkaline errors in extreme pH conditions. This

rugged design makes the CS525 suitable for just about any liquids

applications, from laboratory to harsh field applications.

•Safety. The ISFET with durable PEEK material can be used safely in

areas where broken glass is a hazard to the user.

•Intelligent electronics. CS525 combines the latest developments in ISFET

pH sensor technology with state-of-the-art sensor 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.

This sensing element is driven by an electronic circuit that is built into the

handle of the probe. The CS525 can only perform up to its specifications if

CS525 ISFET pH Probe

connected in the correct way to the datalogger. Any other combinations might

cause a loss of performance and irreversible damage to both probe and/or

datalogger.

1.1 Initial Inspection and Handling Guidelines

Upon receipt of the CS525, inspect the packaging for any signs of shipping

damage, and, if found, report the damage to the carrier in accordance with

policy. The contents of the package should also be inspected and a claim filed

if any shipping related damage is discovered.

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

jacket. If there is any question about damage having been caused to the cable

jacket, a thorough inspection is prudent.

The model number and cable length is printed on the cable label. Check this

information against the shipping documentation to ensure that the expected

model number and cable length were received.

Remember that although the CS525 is designed to be a rugged and reliable

device for field use, it is also a highly precise scientific instrument and should

be handled as such. There are no user serviceable parts and any attempt to

disassemble the device will void the warranty.

2. Specifications

pH Range: 0 to 14

Power Requirements: 4.5 to 5.5 Vdc

Power Consumption: Supply current: 2 mA nominal

Measurement Time: 200 msec < t67% < 500 msec

Output: A) 0 mV to +5000 mV

+2700 mV at pH7 at 25°C with a sensitivity of

270 mV to 330 mV/pH at 25°C

B) ±400 mV with a sensitivity of

-45 mV to -50 mV/pH at 25°C

Accuracy: ±0.1 pH with 2 point calibration

Operating Temperature: 0 to 70° C

Maximum Cable Length: 300 m (1000 ft)

Cable Type: three-twisted pair, 24 awg cable with

Santoprene®jacket

Sensor Material: PEEK

Dimensions: Length 190 mm (7.48 inches)

Diameter 16 mm (0.63 inches)

Weight w/10 ft Cable: 318 g (11.2 oz)

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

CS525 ISFET pH Probe

3. Installation and Wiring

Campbell Scientific only offered the 0 to 5000 mV output range

for CS525 probes ordered before January 2010. These probes

had four wires instead of five. Wire colors were red (signal),

black (power), white (signal reference), and clear (shield).

NOTE

3.1 Preparation for Use

The CS525 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

CS525 ISFET pH probe can be installed without regard to orientation.

3.2 Wiring

The CS525 has two output range options: 0 to 5000 mV or ±400 mV. Select

the output option that best fits the measurement range of the data acquisition

device used.

Campbell Scientific’s CR800, CR850, CR1000, and CR3000 can measure

several output ranges. With these dataloggers, either the 0 to 5000 mV output

or ±400 mV output can be chosen for the CS525. Connect the CS525 to the

CR800, CR850, CR1000, and CR3000 based on the probe’s output option (see

Table 3-1).

TABLE 3-1. CR800, CR850, CR1000, and CR3000 Wiring

Datalogger ConnectionsWire Color Wire Label/Function

0 to 5000 mV ±400 mV

Red Power 5 Vdc 5V 5V

Black Signal Reference

White Signal SE

Green Signal SE

Clear Shield G G

The CR200(X)-series dataloggers can only measure the 0 to 2500 mV output

range. To accommodate this limitation, choose the 0 to 5000 mV output

option for the CS525, and then use a VDIV2:1 to divide the sensor’s 5 Vdc

output to 2.5 Vdc (see Table 3-2).

CS525 ISFET pH Probe

TABLE 3-2. CR200(X) Series Wiring

Wire Color Wire Label/Function VDIV2:1* CR200(X) Series

Red Power 5 Vdc EX

Black Signal Reference G

White Signal H SE

Clear Shield G

*When using the VDIV2:1 with the CR200(X)-series datalogger, the L peg of

the VDIV2:1 is not used and can be removed.

4. Programming

4.1 Using SCWIN for CR800, CR850, CR1000, and CR3000

In SCWIN, the CS525 is programmed by selecting single-ended voltage under

Generic Measurements. SCWIN is the easiest and typically the preferred

method for programming the datalogger. SCWIN generates a wiring diagram

that shows how to connect the CS525 to your Campbell Scientific datalogger.

The sections that immediately follow are for CRBasic users.

SCWIN users can jump ahead to the Calibration section.

NOTE

4.2 Using CRBasic

4.2.1 Simple Program

4.2.1.1 CR200(X) Programming

The CS525 does not require constant power. To conserve power, the

datalogger can be programmed to power the CS525 prior to the measurement,

shut off. This function can be accomplished using the ExDelSE instruction of

a CR200(X) datalogger. A multiplier of 1.0 and an offset of 0.0 yields

millivolts. A corrected multiplier and an offset are required to provide an

output in pH units (see Appendix A).

The ExDelSE instruction has the following format:

ExDelSE(Dest,Reps,SEChan,ExChan,ExmV,Delay,Mult,Offset )

This example program uses the ExDelSE instruction to apply a voltage to

excitation channel one, delay for 30 milliseconds, and then make a

measurement on single-ended analog channel one.

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