Hach-Lange SI792 P, SI792x P, SI792x P-FF, SI792x P-PA User Manual

Download

DOC026.52.00794

si792 P

si792x P

si792x P-FF

si792x P-PA

pH/ORP

2-Wire Transmitters

USER MANUAL

December 2007, Edition 1

Table of Contents ........................................................................ 1

Section 1 Specifications.........................................................5

Section 2 General information...........................................11

2.1 Safety information ....................................................................11

2.1.1 Use of hazard information.................................................11

2.1.2 Precautionary labels..........................................................11

2.2 General product information..................................................... 13

2.2.1 Product overview...............................................................13

2.2.2 FDA 21 CFR part 11 Compliance (HART only)................. 13

2.2.2.1 Electronic signatures for si792 P series transmitters .14

2.2.2.2 Audit trail for si792 P series transmitters....................14

2.3 Product models ........................................................................14

Section 3 Installation..............................................................15

3.1 Hazardous location control drawings .......................................16

3.2 Unpacking the transmitter ........................................................16

3.3 Mechanical installation............................................................. 17

3.3.1 Transmitter assembly........................................................17

3.3.2 Mounting ...................................................... ..................... 18

3.3.2.1 Wall mount.................................................................18

3.3.2.2 Panel or pipe mount (optional)................................... 18

3.4 Wiring Safety Information.........................................................20

3.5 Electrical installation................................................................. 21

3.5.1 Wire preparation................................................................ 21

3.5.2 Power and communication connections............................23

3.5.2.1 si792 P and si792x P (4–20 mA/HART) wiring ..........24

3.5.2.2 si792x P-FF and si792x P-PA wiring..........................25

3.5.3 Sensor wire connection.....................................................25

3.5.3.1 Hach combination pH/ORP sensors wiring................26

3.5.3.2 pH/ORP sensors with solution ground wiring.............27

3.5.3.3 Differential pH/ORP sensor wiring .............................28

3.6 HART communication connection............................................29

Table of Contents

Section 4 Interface and navigation..................................31

4.1 si792(x) P (4–20 mA/HART) interface......................................31

4.2 si792x P-FF and si792x P-PA interface ...................................32

4.3 Display......................................................................................33

Section 5 Operation—4–20 mA/HART............................35

5.1 Measure mode .........................................................................35

5.2 Configuration............................................................................35

5.2.1 Output configuration..........................................................36

5.2.1.1 Output range ..............................................................37

5.2.1.2 Time averaging filter...................................................37

5.2.1.3 Output signal during errors.........................................38

5.2.1.4 Output signal during HOLD........................................38

5.2.2 Temperature compensation configuration.........................39

5.2.3 Calibration mode configuration..........................................40

5.2.4 Alarm settings configuration..............................................40

Section 6 Operation—Foundation Fieldbus................41

6.1 Configuration............................................................................41

6.1.1 Configuration steps ...........................................................41

6.1.2 Configuration menu...........................................................42

6.2 Foundation Fieldbus communication........................................44

6.2.1 Standard resource block (RB)...........................................44

6.2.2 Standard analog input block (AI).......................................47

6.2.2.1 Operating modes........................................................47

6.2.2.2 Set the parameter and units.......................................47

6.2.2.3 Data processing .........................................................48

6.2.2.4 Alarms........................................................................48

6.2.2.5 Bus parameters for the analog input block.................49

6.2.2.6 Cyclic measured value status.....................................52

6.2.2.7 Measured value limits—limit bits................................52

6.2.3 Transducer block...............................................................53

6.2.4 Calibration via Foundation Fieldbus..................................62

Section 7 Operation—Profibus PA...................................63

Table of Contents

7.1 Configuration............................................................................63

7.1.1 Configuration steps ...........................................................63

7.1.2 Configuration menu...........................................................64

7.2 Profibus communication...........................................................65

Section 8 Calibration..............................................................69

8.1 Calibration................................................................................ 69

8.1.1 pH calibration ....................................................................69

8.1.1.1 Calibration with automatic buffer recognition .............70

8.1.1.2 Calibration with manual buffer entry........................... 71

8.1.1.3 Enter calibration data from calibrated probes ............72

8.1.1.4 Calibration by comparison— si792 (x) P (HART) and

si792x P-FF only.................................................................73

8.1.1.5 Zero adjustment for ISFET probes—For si792(x) P

(HART) and si792x P-FF only.............................................74

8.1.2 ORP calibration................................................................. 75

8.2 Temperature probe adjustment................................................77

Section 9 Maintenance...........................................................79

9.1 Cleaning the instrument ...........................................................79

9.2 Sensor maintenance ................................................................79

Section 10 Troubleshooting................................................81

10.1 Sensoface ..............................................................................81

10.2 Sensocheck............................................................................81

10.3 Error codes.............................................................................82

10.4 Calibration errors....................................................................84

10.5 Diagnostic functions............................................................... 86

Section 11 Parts and accessories.................................... 87

11.1 si792 P series versions ..........................................................87

11.2 Accessories............................................................................87

Section 12 Contact information.........................................89

Section 13 Limited warranty ...............................................92

Appendix A Buffer tables......................................................95

Table of Contents

Appendix B Passcode editor............................................103

Index................................................................................ ...............105

Section 1 Specifications

Specifications are subject to change without notice.

Transmitter

Composition PBT (polybutylene terephthalate) Display LCD

Fittings

Power requirements—si792 P and si792x P, (4–20 mA/HART)

Power requirements—FF and Profibus PA

Loop current—si792 P and si792x P, (4–20 mA/HART)

Current consumption—FF and Profibus PA

Maximum current in case of fault (FDE)—FF and Profibus PA

Measurement error

3 knockouts for M20 x 1.5 strain reliefs 2 knockouts for ½ inch NPT or rigid

metallic conduit 14–30 VDC (30 VDC maximum) FISCO bus supply: 9 to 17.5 VDC

Linear barrier: 9 to 24 VDC 4–20 mA floating;

3.80–22.00 mA specifiable <13.2mA

<17.6mA <0.3% of current value + 0.05 mA

Specifications

si792 P 4–20 mA/HART transmitter:

US: si792 P FM listed for:

Class I, Division 2

si792x P; si792x P-FF; si792x P-PA FM listed for:

Class I, Division 1, Groups A, B, C, D Class II, Division 1, Groups E, F, Class III, Division 1 Class I, Zone 0, AEx ia, Group IIC T4

Enclosure: Type 2

Certification (may not apply to all sensors. Refer to the control drawing or listing for certification information for the sensor that is used)

Note: Hach differential pH/ORP sensors are not ATEX certified.

Power output for pHD sensor adapter Output averaging time constant (HART) 0–120 seconds

Output span allowed pH: 2.00 to 18.00; mV: 200 to 3000 Storage temperature –20 to 70 °C (–4 to 158 °F) Operating temperature –20 to 55 °C (–4 to 131 °F) Weight Approximately 1 kg

Canada: si792 P CSA certified to:

Class I, Division 2

si792x P CSA certified and si792x P-FF; si792x P-PA cFMus certified to:

Class I, Division 1, Groups A, B, C, D Class I, Division 2, Groups A, B, C, D Sensor: Class I, Zone 0, Group IIC Transmitter: Class I, Zone 1, Group IIC

Enclosure: Type 2

EU: si792x P; si792x P-FF; si792x P-PA ATEX Certification:

II 2 (1) G EEx ib (ia) IIC T6

EU: CE Marked to:

EMC Directive 2004/108/EC ATEX Directive 94/ 9/EC

Enclosure: IP65 +3 V/0.5 MA –6 V/0.5 mA (5.0 to 5.2 V,

maximum 640 µA)

Data retention

Passcodes

Sensocheck

Sensor monitor

Communications

HART communication

Foundation Fieldbus (FF_H1)

Specifications

Parameters and calibration data >10 years (EEPROM)

Modifiable according to FDA 21 CFR Part 11 “Electronic Signatures” (HARTonly)

Sensocheck automatic monitoring of glass and reference electrode (can be disabled). Delay: 30 seconds.

Direct display of measured values from sensor for validation (electrode potential/temperature)

Digital communication by FSK modulation of loop current, reading of device identification, measured values, status and messages, reading and writing of parameters, start of product calibration, signaling of configuration changes according to FDA 21 CFR Part

11. Bus-powered device with constant

current consumption. Cyclic and acyclic data exchange. 1 resource block, 1 transducer block, 3 analog input function blocks (switchable: pH, ORP, temperature, R

asymmetry potential) Execution time: 50 ms Certified to ITK 4.6 Physical interface: to IEC 1158-2 Address range: 017 to 246

glass

, R

, slope,

ref

Specifications

Bus-powered device with constant current consumption. Cyclic and acyclic data exchange. Physical block, 2 analog input function blocks, 2 discrete input blocks, logbook block, alarm block.

PNO directive: PROFIBUS-PA,

Profibus-P A (DPV1)

Temperature input

Probe

Range, Pt100/Pt1000

Range, NTC 300 Ω –20.0 to 110.0 °C (–4 to 230 °F) Resolution 0.1 °C; 0.1 °F

Measurement error

Temperature compensation of sample

pH/ORP inputs

pH/ORP

Glass/reference electrode input Input resistance—glass electrode

1,2

Profile for Process Control Devices, Version 3.0

Physical interface: MBP-IS (Manchester Bus Powered–Intrinsically Safe) to IEC 1158 -2 (DIN-EN 61158-2)

Connection: via segment coupler to SPC, PC, PCS

Address range: 1 to 126

Pt100/PT1000/NTC 300 Ω (selectable), 2-wire connection

si792 P; si792x P; si792x P-FF: –20.0 to 200.0 °C (–4 to 392 °F)

2x P-PA:

si79 –20.0 to 150.0 °C (–4 to 302 °F)

<0.5 K (<1 K for Pt100; <1 K for NTC >100 °C)

Linear –19.99 to 19.99%/K (25 °C reference temperature)

Input for Combination or Differential pH/ORP Sensors

IEC 746 Part 1, at nominal operating conditions

>0.5 x 10

Specifications

Input resistance—reference electrode Input current—glass electrode Input current—reference electrode Measurement range –1500 to 1500 mV

Measurement error—pH Measurement error—mV

1,2

Display range—pH –2.00 to 16.00 pH units Display range—ORP –1999 to 1999 mV

pH sensor calibration

Offset range ± 60 mV Slope range 85 to 103% (47.5 to 61 mV/pH unit) Calibration timer 0 to 9999 hours

ORP sensor calibration (si792 P, si792x P and si792x P-FF only)

Calibration range –700 to 700 mV Calibration timer 0 to 9999 hours

(± 1 count plus sensor error)

IEC 746 Part 1, at nominal operating conditions

10 –12 –10

A A

>1 x 10 <2 x 10 <1 x 10

<0.02 pH units plus sensor error; TC: 0.002 pH/K

<1 mV plus sensor error; TC: 0.1 mV/K

Specifications

Section 2 General information

2.1 Safety information

Please read this entire manual before unpacking, setting up, or operating this equipment. Pay attention to all danger and caution statements. Failure to do so could result in serious injury to the operator or damage to the equipment.

To ensure that the protection provided by this equipment is not impaired, do not use or install this equipment in any manner other than that specified in this manual.

2.1.1 Use of hazard information

DANGER Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION Indicates a potentially hazardous situation that may result in minor or moderate injury.

Important Note: Information that requires special emphasis. Note: Information that supplements points in the main text.

2.1.2 Precautionary labels

Read all labels and tags attached to the instrument. Personal injury or damage to the instrument could occur if not observed. A symbol, if noted on the instrument, will be included with a danger or caution statement in the manual.

This symbol, if noted on the instrument, references the instruction manual for operation and/or safety information.

General information

Electrical equipment marked with this symbol may not be d isposed of in European public disposal systems after 12 August of 2005. In conformity with European local and national regulations (EU Directive 2002/96/EC), European electrical equipment users must now return old or end-of life equipment to the Pro ducer for disposal at no charge to the user.

Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return end-of-life equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.

This symbol, when noted on a product enclosure or barrier, indicates that a risk of electrical shock and/or electrocution exists.

This symbol, when noted on the product, identifies the location of the connection for Protective Earth (ground).

This symbol, when noted on the product, identifies the location of a fuse or current limiting device.

This symbol, when noted on the product, ident ifie s a risk of chemical harm and indicates that only individuals qualified and traine d t o work with chemicals should handle chemicals or perform maintenance on chemical delivery systems associated with the equipment.

This symbol, when noted on the product, ident ifies th e pr esence of a strong corrosive or other hazardous substance and a risk of chemical harm. Only individuals qualified and trained to work with chemicals should handle chemicals or perform maintenance on chemical delivery systems associated with the equipment.

This symbol, when noted on the product, indicated the presence of devices sensitive to Electro-static Discharge (ESD) and indicated that care must be taken to prevent damage with the equipment.

This symbol, when noted on the product, ident ifies th e pr esence of a noxious substance and a risk of chemical harm. Only individuals qualified and trained to work with chemicals should handle chemicals or perform maintenance on chemical delivery systems associated with the equipment.

General information

2.2 General product information

2.2.1 Product overview

The si792 P series transmitters are used for pH/ORP and temperature measurement in industry, environment, food processing and sewage treatment. This manual describes the installation, operation and maintenance for standard and EU models of the si792 P series transmitters.

The molded transmitter enclosure can be attached to a panel, wall, post or pipe railing. The optional hood (see Accessories on page 87) provides protection against direct weather exposure and mechanical damage.

Three communication protocols are available for the si792 transmitter:

• 4–20 mA/HART—Models si792(x) P, includes the si792 P and si792x P models

• Foundation Fieldbus—si792x P-FF

• Profibus PA—si792x P-PA

This user manual includes instructions for all three protocols.

Important Note: An ‘x’ in the model number is an indication of an instriniscally safe (IS) instrument.

2.2.2 FDA 21 CFR part 11 Compliance (HART only)

In the directive “Title 21 Code of Federal Regulations, 21 CFR Part 11, Electronic Records; Electronic Signatures” the US American health agency FDA (Food and Drug Administration) regulates the production and processing of electronic documents for pharmaceutical development and production. The features described in section 2.2.2.1 and section 2.2.2.2 make the transmitter compliant with the requirements of FDA 21 CFR Part 11.

General information

2.2.2.1 Electronic signatures for si792 P series transmitters

Device functions are protected by passcode access, which prevents unauthorized modification of device settings or manipulation of measurement results. Passcodes may be used as electronic signatures. Passcodes can be edited with the passcode editor (Appendix B on page 103).

2.2.2.2 Audit trail for si792 P series transmitters

The si792 series can automatically track all changes to the device settings. Each change is tagged with a Configuration Change flag, which is documented using HART communication. Altered device settings or parameters can be retrieved from the transmitter using HART communication.

2.3 Product models

The si792 P series instruments are programmed at the factory with default settings for specific sensors and probes. The default settings, chosen to accommodate regional safety standards, can be changed by the user.

See Parts and accessories on page 87 for a list of instrument models.

Section 3 Installation

DANGER Explosion hazard. The installation and commissioning of this equipment must only be carried out by trained personnel.

DANGER Explosion hazard. Never connect items to the transmitter that are not specified on the control drawing. Do not connect or disconnect any equipment unless power has been switched off or the area is known to be non-hazardous.

DANGER Explosion hazard. The safety of the transmitter may be impaired if any of the following conditions have occurred:

• visible damage

• storage above 70 °C for prolonged periods

• exposure to severe transport stresses

• previous installation

• failure to operate properly

If any of these conditions have occurred, return the device to the manufacturer for recertification.

DANGER Explosion hazard. pHD sensors (PDxxx and RDxxx) must have a serial number greater than 0712431582 to be used in C1D1 hazardous locations. Check the serial number of the pHD sensor before wiring the sensor to si792x P, si792x P-FF or si792x P-PA instruments.

The si792 and si792x transmitters differ in hazard classification. The si792 transmitter is designed for non-hazardous or Class I, Division 2, Groups A, B, C, D hazardous locations. The si792x transmitter is designed for Class I, Division 1, Groups A, B, C, D hazardous locations. Refer to the control drawing or listing applicable to the site location.

Installation

For outdoor installation, use of a protective hood or sunshield is recommended (section 11.2 on page 87).

Installation of the si792x in an outdoor hazardous location per FM or CSA control drawings requires a suitable enclosure and must follow NEC guidelines. Refer to NEMA 250 to determine enclosure needs.

3.1 Hazardous location control drawings

Before installation, review the applicable Hazardous Location Control Drawings or ATEX EC-type Examination Certificates included with the instrument and on the provided documentation CD. Follow all regulations specified for the installation location.

Refer to the documentation CD for manuals provided in other languages.

3.2 Unpacking the transmitter

Check the shipment for transport damage and make sure all components have been shipped complete. The package includes:

• Display module • Bag of hardware and fasteners

• Back enclosure • Test report and user manual

Installation

Figure 1 Instrument Components

1 Back enclosure 8 Strain relief (3x) 2 Optional conduit hardware 9 Filler plug (3x) 3 Conduit washer 10 Enclosure screw (4x) 4 Jumper (2x) 11 Display module 5 Cable tie (3x) 12 Hinge pin 6 Sealing insert 13 Hex nuts (5x) 7 Rubber reducer 14 Sealing plug (2x)

3.3 Mechanical installation

3.3.1 Transmitter assembly

Refer to Figure 1 and the following instructions to assemble the transmitter.

Installation

1. Insert the strain relief fittings in the holes of the back enclosure and

secure with the hex nuts (Figure 2).

2. Insert the conduit hardware or plugs in the back enclosure and secure with the hex nuts.

3. Attach the display module to the back enclosure using the hinge pin.

3.3.2 Mounting

Refer to the following sections to mount the transmitter on a wall, panel or pipe.

3.3.2.1 Wall mount

1. Use a punch to open the two wall-mount holes in the back enclosure

(Figure 2).

2. Drill holes in the wall suitable for the user-supplied mounting bolts.

3. Attach the back enclosure to the wall using two customer-supplied

bolts.

4. Insert the clear plastic plugs into the mounting holes.

3.3.2.2 Panel or pipe mount (optional)

Refer to Figure 2 and the instructions supplied with the panel and pipe mounting kits (see Accessories on page 87).

Installation

Figure 2 Wall attachment dimensions

1 Breakout for wall mounting (2x) 5 Groove for panel mount gasket 2 Hole for pipe mounting (4x) 6 Strain relief opening (3x) 3 Strain relief (3x) 4 Breakout for panel mounting

7 S train relief or ½ i nch conduit opening

(2x) Ø 21.5 mm [0.85 in]

Installation

3.4 Wiring Safety Information

When making any wiring connections to the instrument, the following warnings and notes must be adhered to, as well as any warnings and notes found throughout the individual installation sections. For more safety information refer to section 2.1 on page 11.

DANGER Always disconnect power to the instrument when making any electrical connections.

Electrostatic Discharge (ESD) Considerations

To minimize hazards and ESD risks, maintenance procedures not requiring power to the analyzer should be performed with power removed.

Delicate internal electronic components can be damaged by static electricity, resulting in degraded instrument performance or eventual failure.

The manufacturer recommends taking the following steps to prevent ESD damage to the instrument:

• Before touching any electronic components (such as printed circuit cards and the components on them) discharge static electricity from the body by touching an earth-grounded metal surface such as the chassis of an instrument or a metal conduit or pipe.

• To reduce static build-up, avoid excessive movement. Transport static-sensitive components in anti-static containers or packaging.

• To discharge static electricity from the body and keep it

discharged, wear a wrist strap connected by a wire to earth ground.

• Handle all static-sensitive components in a static-safe area. If

possible, use anti-static floor pads and work bench pads.

Installation

3.5 Electrical installation

DANGER Explosion hazard. Do not connect any components that are not specified for the device. Always refer to the Hazardous Location Control Drawing.

Prerequisites:

• Review the applicable control drawing or EC-type Examination certificate.

• Review the electrical code regulations

• Review the regulations for electrical installations in hazardous locations (e.g. EN 60079-10/EN 60079-14; 97/9/EC directive; NEC; CEC; Profibus Technical Guidelines)

• Remove power or confirm non-hazardous status before making any connections

• Confirm that the intrinsic safety of the device is maintained when connected to other equipment such as a power supply unit.

3.5.1 Wire preparation

To remove the terminal blocks from the transmitter for sensor wiring:

1. Insert a flat screwdriver between the terminal block and the transmitter body.

2. Use the screwdriver as a lever to lift the terminal block off the connectors (see Figure 3 on page 22).

Installation

Figure 3 Wire preparation and insertion

1 Stripping lengths for cables 6 Terminals (vary by model number) 2 Stripping lengths for coaxial cables 7 Typical terminal

Cable shield connection

Note:

Do not connect to earth ground.

4 ESD shield removed 9 Removing terminal with screwdriver 5 Areas for screwdriver to pry terminal 10 Cable loop position in housing

8 Seat insulation against connector

Installation

3.5.2 Power and communication connections

DANGER Explosion hazard. The AC power source for the power supply unit cannot exceed 250 VAC. Do not connect the transmitter directly to an AC power source.

DANGER Explosion hazard. The output voltage of the power supply unit cannot exceed 30 VDC. The si792x transmitter must be connected to an appropriately certified explosion-proof power supply unit. Refer to "associated apparatus" in the control drawing or to the EC-Type Examination Certificate for input ratings.

Prerequisites

• Trained personnel only must install or commission the

equipment.

• Follow the instructions in this user manual and the applicable

local and national codes.

• Observe the technical specifications and input ratings during

installation.

• Disconnect all power sources during wiring and installation.

• Use single wires/flexible leads up to 2.5 mm (AWG 14) for

connection to terminals.

• Do not damage the wire when stripping the insulation.

• All parameters must be set by a system administrator (Authority

Having Jurisdiction) before commissioning.

Installation

3.5.2.1 si792 P and si792x P (4–20 mA/HART) wiring

DANGER Explosion hazard. Never connect items to the transmitter that are not specified on the control drawing/ATEX EC-type certificate.

Use Figure 4 and Table 1 to connect the power supply to the si792 P and si792x P (4–20 mA/HART)..

Figure 4 si792(x) P wiring

1 Wiring terminals—see Table 1

Table 1 Terminal assignments—si792(x) P

TerminalNo. Assignment

14 4–20 mA output (–) 15 4–20 mA output (+)

2 HART connection (see warnings in

section 3.6 on page 29)

Installation

3.5.2.2 si792x P-FF and si792x P-PA wiring

Use Figure 5 and Table 2 to connect power and communication to the si792x P-FF (Foundation Fieldbus) or si792x P-PA (Profibus).

Figure 5

1 Wiring terminals—see Table 2

Table 2 Terminal assignments—si792x P-FF and si792x P-PA

Terminal No. Assignment

14 Connection from FF or Profibus PA (–) 15 Connection from FF or Profibus PA (+)

si792x P-FF and si792x P-PA wiring

3.5.3 Sensor wire connection

Important Note: Do not connect earth ground to the shield connector in the transmitter. Connect the cable shields to the shield connector.

Refer to the following sections to connect the transmitter to a sensor:

• Hachcombination pH/ORP sensors—section 3.5.3.1 on page 26

• pH/ORP solution ground sensors—section 3.5.3.2 on page 27

• pH/ORP differential sensors—

section 3.5.3.3 on pag e 28

Installation

3.5.3.1 Hach combination pH/ORP sensors wiring

1. Install the jumpers shown in Figure 6.

2. Use Table 3 to wire the sensor to the transmitter.

Figure 6 Wiring for Hach combination pH/ORP sensors

1 Jumper between terminal 4 and 5 2 Wiring terminals—see Table 3

Table 3 Terminal assignments—pH/ORP sensors

Terminal

Assignment

No.

1 Measure electrode

4 Reference electrode braided coaxial shield

Cable shield connection

Note:

Do not connect to earth ground.

Hach PC and RC

series color

coaxial cable center

wire

Six-plug

connection

coaxial cable center

wire

braided coaxial

shield

Installation

Table 3 Terminal assignments—pH/ORP sensors (Continued)

RTD (resistive temp

device) RTD (resistive temp

device)

3.5.3.2 pH/ORP sensors with solution ground wiring

Use Figure 7 and Table 4 to wire the sensor to the transmitter.

red green

white white

Figure 7 Wiring for pH/ORP sensors with solution ground

1 Wiring terminals—see Table 4

Cable shield connection

Note:

Do not connect to earth ground.

Installation

Table 4 Terminal assignments—sensors with solution ground

TerminalNo. Assignment

1 Measure electrode 4 Reference electrode 5 Solution ground 7 RTD (resistive temperature device) 8 RTD (resistive temperature device)

3.5.3.3 Differential pH/ORP sensor wiring

Use Figure 8 and Table 5 on page 29 to wire the sensor to the transmitter. The pHD sensor has 7 wires (2 shield wires). The LCP sensor has 6 wires (1 shield wire).

Figure 8

1 Wiring terminals—see Table 5 on page 29

Wiring for differential pH/ORP sensors (PDXXX/RDXXX)

Installation

Table 5 Terminal assignments—differential sensors

Terminal No. Assignment Hach wire color

1 Measure electrode (pHD is Reference) red 4 Reference electrode (pHD is Measure) green

Cable shield connections (2 shield wires for

Hach pHD, 1 shield wire for Hach LCP)

Note:

Do not connect to earth ground.

8 RTD (resistive temperature device) yellow 17 –6 V white 18 GND black

shield

3.6 HART communication connection

DANGER The si792x transmitter must be used with an explosion-proof HART communication device. Refer to the appropriate control drawing for the location of the HART (Rosemount) device.

The handheld HART communication device can only be connected to the transmitter in US Class I, Division 1 classified locations (permitted only by FM). Do not connect the handheld Hart communication device to the transmitter in any Zone or Canadian Class I, Division 1 classified location. Refer to Figure 4 on page 24 for the connector location.

Installation

Section 4 Interface and navigation

The si792 transmitter user interface contains a display, indicators and keys for navigation and menu selection.

4.1 si792(x) P (4–20 mA/HART) interface

Use the arrow and enter keys to scroll through the menu and change settings. Use the indicators to identify which mode the transmitter is in. Refer to Figure 9 to identify the keys and indicators of the si792(x) P.

Figure 9 User interface—si792( x) P

1 Calibration key 7 Wash mode indicator (not available) 2 Configure key 8 Configuration mode indicator 3 Measure mode indicator 9 Up arrow key 4 Calibration mode indicator 10 Right arrow key 5 Alarm indicator 6 Display

11 Enter key

Interface and navigation

4.2 si792x P-FF and si792x P-PA interface

Refer to Figure 10 to identify the keys and indicators of the si792x P-FF and si792x P-PA.

Figure 10 User interface—

1 Measure key 7 Communication indicator 2 Calibration key 8 Configuration mode indicator 3 Measure mode indicator 9 Up arrow key 4 Calibration mode indicator 10 Right arrow key 5 Alarm indicator 11 Enter key 6 Display 12 Configuration mode

si792x P-FF and si792x P-PA

Interface and navigation

4.3 Display

Figure 11 identifies all of the possible icons and symbols that may be

seen in the si792 transmitter display.

Figure 11 Display

1 Passcode 13 Secondary display 2 Temperature 14 Alarm mode 3 4–20 mA/HART output 15 Manual temperature on 4 Limit values (FF and Profibus PA) 16 Calibration mode 5 Alarm 17 Hold mode active 6 Sensocheck—probe error 18 Hourglass (waiting indication) 7 Calibration active 19 Measure mode active 8 Calibration interval 20 Calibration complete 9 Parameter display 21 Calibration—zero or first point 10 Enter prompt 22 Calibration—second point 11 Configuration mode 12 Main display

23 Sensofaces

Interface and navigation

Section 5 Operation—4–20 mA/HART

The following section describes how to operate the si792(x) P (4–20 mA/HART) transmitters.

5.1 Measure mode

In the measure mode the display shows the pH or ORP value and the temperature. The status bar is shown above the measure mode indicator.

• To return to the measure mode from the configure menu, press

CONF and then ENTER.

• To return to the measure mode from the calibration menu, press

CAL and then ENTER.

Note: The waiting time for the stabilization of the measured value is approximately 20 seconds.

5.2 Configuration

Use the configuration mode to specify the sensor, range and other parameters for the system as shown in Table 6.

1. Press CONF and enter 1200 to enter the configuration mode.

2. Use the arrow and enter keys to change the settings. All settings

and options are shown in section 5.2.1, section 5.2.2,

section 5.2.3 and section 5.2.4.

Table 6 Configuration menu

Code Setting Passcode

o1 4–20 mA current output tc Temperature compensation CAL Calibration setup AL. Alarm settings

1200

Operation—4–20 mA/HART

To exit the configuration mode at any time, press

ENTER. The output current will be held for 20 seconds and the

measured value will be displayed.

Note: During configuration the transmitter remains in the Hold mode for safety reasons. The loop current is held at the value specified in the o1.HoLD menu option. The Sensoface icon is inactive. The configuration mode indicator is displayed (Figure 11 on page 33).

5.2.1 Output configuration

An overview of the 4–20 mA output setup menu is shown in Table 7.

Table 7 Output setup menu—out.1

Select the parameter

o1.UniT

Specify the value for the 4 mA si gn a l (section 5.2.1.1)

o1.4mA

Specify the value for the 20 mA si g n a l (section 5.2.1.1)

o1.20mA

Set time averaging filter for reducing noise (section 5.2.1.2)

o1.Ftme Enter the time in seconds (0 to 120 seconds; default: 0 seconds)

Send a 22 mA signal during errors (section 5.2.1.3)

o1.FAil

Specify the value to output during HOLD periods (section 5.2.1.4)

o1.HoLD

pH (default) o1.EL (electrode)

ORP

Enter the pH value (–2.00 to 16.00 pH; default: 0 pH) Enter the ORP value (–1999 to 1999 mV; default: 0 mV)

Enter the pH value (–2.00 to 16.00 pH; default: 14 pH) Enter the ORP value (–1999 to 1999 mV; default: 14 mV)

On Off (default)

LAST measured value (default) FIXed

Enter the fixed value to output in mA (3.8 to 22 mA; default: 21 mA)

CONF and then

MNU

Glass (default for EU version) ISFET pHD (default for standard ver-

sion; for pHD and LCP sensors)

Operation—4–20 mA/HART

Press

ENTER to access a menu item. Use the ARROW KEYS to edit

values. Press acceptable range, “Err” will be displayed and the value will not be accepted. T o exit the menu and return to the measurement mode, press

CONF and then ENTER.

Example: Set the 4 mA current output signal to 3 pH.

1. Press Conf and then out.1MNU.

2. Press show o1.UniT.

3. Press show o1.4mA.

4. Use the

03.00 pH. Press

o1.20mA.

5. Press

5.2.1.1 Output range

The upper and lower end of the pH or ORP measurement range should correspond to the 4 mA and 20 mA signals. For example, to set a range of 3–12 pH, set the 4 mA signal to correspond to a pH value of 3 and the 20 mA signal to correspond to a pH value of 12.

5.2.1.2 Time averaging filter

An averaging filter is available to reduce noise in the output signal. The filter averages readings over a specified time interval. The time interval can be set from 0 to 120 seconds (default: 0 seconds).

When set to 0 seconds, there is no signal averaging for noise reduction. When set to 120 seconds, the current output value will be correspond to the process signal averaged over the last 120 seconds. Increase the time interval to reduce the noise in the output signal.

Note: The filter acts on the output signal but not on the displayed value.

ENTER to save the settings. If a value is outside of the

CONF, enter passcode: 1200, ENTER. The display will show

ENTER to access the output setup menu. The display will

ENTER, ENTER to show the 4 mA submenu. The display will

UP ARROW and RIGHT ARROW to edit the value to

ENTER to save the value. The display will show

CONF and then ENTER to exit the configuration menu.

Operation—4–20 mA/HART

5.2.1.3 Output signal during errors

When an error condition occurs, a 22 mA output signal can be sent as a notification (default: off).

5.2.1.4 Output signal during HOLD

The output signal during hold periods can be maintained at the last measured value (Figure 12) or fixed at a specified value (Figure 13). The allowable range for the fixed value is 3.4 to 22 mA.

Figure 12 Output signal during HOLD—last value

1 Output signal during HOLD 2 HOLD mode time span

Figure 13 Output signal during HOLD—fixed value

1 Output signal during HOLD 2 HOLD mode time span

Operation—4–20 mA/HART

5.2.2 Temperature compensation configuration

An overview of the temperature compensation setup menu is shown in

Table 8.

Table 8 Temperature compensation setup menu—tc

Select temperature unit

tc.UnIT

Select temperature probe

tc.rTD

Temperature detection during measurement

tc.MEAS

Temperature detection during calibration

tc.CAL

pH only temperature compensation of process medium

tc.LIN Enter compensation (–19.99 to 19.99%/K; default: 0% /K)

Press values. Press

°C (default) °F

Pt100 Pt1000 (default for EU version) NTC300 (default for standard version with pHD and LCP sensors)

Auto (default) Manual

Enter the temperature (–20 to 200 °C; default: 25 °C) Enter the temperature (–4.0 to 392 °F; default: 25 °F)

Enter the temperature (–20 to 200 °C; default: 25 °C) Enter the temperature (–4 to 392 °F; default: 25 °F)

ENTER to access a menu item. Use the ARROW KEYS to edit

ENTER to save the settings. If a value is outside of the

acceptable range, “Err” will be displayed and the value will not be accepted. T o exit the menu and return to the measurement mode, press

CONF and then ENTER.

MNU

Operation—4–20 mA/HART

5.2.3 Calibration mode configuration

An overview of the calibration setup menu is shown in Table 9. Refer to

Appendix A on page 95 for buffer tables.

Table 9 Calibration mode setup menu—CAL mnu

Select pH buffer set

–01–BUF Knick/Mettler-Toledo –02–BUF Merck Titrisols, Riedel Fixanals –03–BUF Ciba (94) –04–BUF NIST technical buffers

CA.SOL

Enter calibration timer interval

CA.tiME

5.2.4 Alarm settings configuration

An overview of the alarm setup menu is shown in Table 10.

Select Sensocheck

AL.SnSO

Enter alarm delay

AL.dLY 0010 sec (default) Range: 0000–0600 sec

LED in Hold mode

AL.LED

–05–BUF NIST standard buffers –06–BUF (default) HACH buffers –07–BUF WTW technical buffers –08–BUF Hamilton Duracal MAN (manual entry, for buffers not listed in this table) DAT—Entry of offset and slope of premeasured electrodes

Enter the time interval for calibration (0 to 9999 hours; default: 0 h to disable timer)

Table 10 Output setup menu for alarm settings

CHECK ON CHECK OFF (default)

HOLD ON LED blinks during hold HOLD OFF LED off during hold

Continuous Sensocheck evaluation of probe function

Section 6 Operation—Foundation Fieldbus

The following section describes how to operate the si792x Fieldbus transmitter. The transmitter can be operated as follows:

• Direct interface with the transmitter (section 6.1)

• Foundation Fieldbus communication (section 6.2 on page 44)

6.1 Configuration

Use the configuration mode to specify the sensor, range and other parameters for the system.

6.1.1 Configuration steps

Complete the following steps to configure the si792 transmitter.

1. Press MEAS + CAL and enter 1200 to enter the configuration mode.

2. Use the arrow and enter keys to change the settings. All settings and options are shown in section 6.1.2.

To exit the configuration mode at any time, press MEAS + CAL and

ENTER. The Hold mode will be active for 20 seconds and then the

then measured value will be displayed.

Note: During configuration the transmitter remains in the Hold mode for safety reasons. The Sensoface icon is inactive. The configuration mode indicator is displayed (Figure 10 on page 32).

Operation—Foundation Fieldbus

6.1.2 Configuration menu

Select the process variable

In.UnIT

Select electrode type

ln.SnSR

Select temperature unit

tc.UnIT

Select temperature sensor

tc.rTD

Select temperature during measurement

tc.MEAS

Select temperature during calibration

tc.CAL

Select TC process medium

tc.LIN –19.9–19.99 %/K (default: 00.00 %/K)

pH (default) Range: –2.00–16.00 pH ORP Range: –1500 mV–1000 mV

Glass (default for EU version) ISFET pHD (default for standard version, with pHD and LCP sensors)

°C (default) °F

PT100 PT1000 (default for EU version) 300 NTC (default for standard version, with pHD and LCP sensors)

Auto (default) Manual

°C (default: 25 °C) Range: –20–150 °C °F Range: –004–0392 °F

°C (default: 25 °C) Range: –20–100 °C °F Range: –004–0392 °F

Operation—Foundation Fieldbus

6.1.2 Configuration menu (continued)

Select calibration mode / solution

-01-BUF Mettler-Toledo

-02-BUF Merck Titrisols, Riedel Fixanals

-03-BUF Ciba (94)

-04-BUF NIST technical buffers

CA.SOL

CA.timE CAL timer interval 0000–9999 h (default: 0000h)

Select Sensocheck

AL.SnSO

LED in Hold mode

AL.LED

Enter Fieldbus address (optional)

FF.ADR 0017–0031 BUS (default: 0026 BUS)

Use only when there is no bus connection. The transmitter will restart and set all

parameters to default values. Individual settings must be ent ered once more.

-05-BUF NIST standard buffers

-06-BUF (default) HACH buffers

-07-BUF WTW technical buffers

-08-BUF Hamilton MAN (manual entry, for buffers not listed in this table)

CHECK ON CHECK OFF (default)

HOLD ON LED blinks during hold HOLD OFF (default) LED off during hold

Continuous Sensocheck evaluation of sensor function

Operation—Foundation Fieldbus

6.2 Foundation Fieldbus communication

Use the Foundation Fieldbus specification to set up and configure the si792 transmitter. The communication parameters are listed in the following sections. The sensor can be calibrated as described in

section 6.2.4 on page 62.

6.2.1 Standard resource block (RB)

The standard resource block describes the transmitter characteristics (manufacturer, device name, operating status, global status). The resource block must be in automatic mode for any of the other blocks to operate. The bus parameters for the standard resource block (RB) are shown in Table 11.

Table 11 Bus parameters—resource block (RB)

Parameter Description Default R/W

ST_REV Static revision 0 R TAG_DESC TAG description R/W STRATEGY Strategy 0 R/W ALERT_KEY Alert key 0 R/W

Target

MODE_BLK

BLOCK_ERR Block error R RS_STATE Resource state 1 R TEST_RW Test R/W DD_RESOURCE DD resource R MANUFAC_ID Manufacturer ID 0x001D6D for Hach R DEV_TYPE Device type 0x0064 R DEV_REV Device revision 1 R DD_REV DD revision 1 R

Actual — Permitted OOS, Auto Normal Auto

(out of service)

OOS

R/W

Operation—Foundation Fieldbus

Table 11 Bus parameters—resource block (RB) (continued)

Parameter Description Default R/W

GRANT_DENY HARD_TYPES Hardware type 1 R

RESTART Restart R/W FEATURES Feature supported Reports/ Soft W Lock R FEATURES Feature selected Reports/ Soft W Lock R/W

CYCLE_TYPE Cycle type

CYCLES_SEL Cycle selected MIN_CYCLE_T Min cycle time

MEMORY_SIZE Memory size R NV_CYCLE_T Non-volatile cycle time R FREE_SPACE Free space R FREE_TIME Free time R SHED_RCAS R/W SHED_ROUT R/W FAULT_STATE Fault state R SET_FSTATE Set fault state 1 R/W CLR_FSTATE Clear fault state 1 R/W MAX_NOTIFY Max notifications 20 R LIM_NOTIFY Limit of notification 8 R/W CONFIRM_TIME Confirmation time WRITE_LOCK Write locking 1 (Unlocked) R/W

UPDATE_EVT

Grant 0 R/W Deny 0 R/W

Scheduled/ Block Execution

1600

/32 ms (50ms)

/32 ms

640000

Unacknowledged 0 R/W Update state 0 R Time stamp 0 R Static revision 0 R Relative index 0 R/W

R/W

Operation—Foundation Fieldbus

Table 11 Bus parameters—resource block (RB) (continued)

Parameter Description Default R/W

Unacknowledged R/W

BLOCK_ALM

ALARM_SUM

ACK_OPTION WRITE_PRI Write priority 0 R/W

WRITE_ALM

ITK_VER ITK_version 4 R

DEVICE_LOCK

Alarm state R Time stamp R Sub-code R Value R Current R Unacknowledged R Unreported R Disabled R/W Automatic acknowledge

option

Unacknowledged R/W Alarm state R Time stamp R Sub-code R Value R

Locks the device for local access.

1 byte Data type = uns8 Range:

0 (Unlocked) 1 (Locked)

0 (Disabled) R/W

0 (Unlocked) R /W

Operation—Foundation Fieldbus

6.2.2 Standard analog input block (AI)

Three Analog Input Function Blocks provide for cyclic transmission of measured values (currently measured value with status, alarm limits, freely selectable process parameter).

6.2.2.1 Operating modes

Use the MODE_BLK parameter to set the following operating modes:

• OOS—out of service. If not write-protected, access to all

parameters is allowed.

• MAN—manual

• Auto—online, normal state

6.2.2.2 Set the parameter and units

Use CHANNEL to set the measured parameter and units (Table 12). The corresponding measurement unit is selected in the UNITS subparameter of XD_SCALE (Table 13 on page 49).

Table 12 Measurement parameters and units

Channel Parameter Unit

1pH pH 2ORP mV

3 Temperature 4 Glass impedance MΩ

5 Ref. impedance kΩ 6Slope % 7 Asymmetry potential mV

°C °F

Operation—Foundation Fieldbus

6.2.2.3 Data processing

Use the L_TYPE parameter to apply a linearization function to the data.

• Direct—data is sent directly from the TB to the AI without processing. The units for the XD_SCALE and OUT_SCALE parameters must be identical.

• Indirect—data from the TB is linearly scaled from the input scale (XD_SCALE) to the output scale (OUT_SCALE).

• Indirect square root—data is rescaled from the input scale (XD_SCALE) and recalculated using a root function. Then the value is linearly scaled to the output scale (OUT_SCALE).

6.2.2.4 Alarms

The AI block can generate block alarms and limit alarms. Use the ACK_OPTION parameter to specify if an alarm must be acknowledged. When the measured value status is “bad”, the AI block BLOCK_ERR parameter indicates an Input Failure.

• Block alarms—a block error will be reported via the BLOCK_ERR parameter (simulate active, input failure, block configuration error, out of service (OOS)). The BLOCK_ALM parameter sends the alarm status to the control system.

• Li mit alar ms—the measured value OUT falls outside of the limit values (HI_HI_LIM, HI_LIM, LO_LIM, LO_LO_LIM).

If an alarm occurs, evaluate the following bus parameters:

• OUT parameter (currently measured value) in the Al block

• LAST_ERROR parameter in the transducer block

• SENSOFACE_STATUS parameter in the transducer block

Operation—Foundation Fieldbus

6.2.2.5 Bus parameters for the analog input block

The bus parameters for the analog input function block (AI) are shown in Table 13.

Table 13 Bus parameters/analog input blocks (AI)

Parameter Description Default R/W

ST_REV Static Revision 0 R TAG_DESC TAG Description R/W STRATEGY Strategy 0 R/W ALERT_KEY Alert Key 0 R/W

Target OOS

MODE_BLK

BLOCK_ERR Block Error R PV

OUT

SIMULATE

XD_SCALE

OUT_SCALE

Actual — Permitted OOS, Auto Normal Auto

Process Value R Status R Measured Value R Status R Simulate Status R/W Simulate Value R/W Transducer S tatus R Transducer Value R Simulate Enable / Disable R/W High Range 100 R/W Low Range 0 R/W Units Index 0 R/W Decimal Point 0 R/W High Range 100 R/W Low Range 0 R/W Units Index 0 R/W Decimal Point 0 R/W

R/W

Operation—Foundation Fieldbus

Table 13 Bus parameters/analog input blocks (AI) (continued)

Parameter Description Default R/W

GRANT_DENY IO_OPTS IO Block Options 0 R/W

STATUS_OPTS Status Options CHANNEL Channel 1 R/W L_TYPE Linearization Type 0 R/W LOW_CUT Low Cut Off 0 R/W PV_TIME Filter Time 0 R/W

FIELD_VAL

UPDATE_EVT

BLOCK_ALM

ALARM_SUM

ACK_OPTION AlARM_HYS Alarm Hysteresis 0.50% R/W

HI_HI_PRI High High Priority 0 R/W HI_HI_LIM High High Limit INF R/W HI_PRI High Priority 0 R/W HI_LIM High Limit INF R/W LO_PRI Low Priority 0 R/W

Grant 0 R/W Deny 0 R/W

Percent Value R Status R Unacknowledged 0 R/W Update State 0 R Time Stamp 0 R Static Revision 0 R Relative Index 0 R Unacknowledged 0 R/W Alarm State 0 R Time Stamp 0 R Sub-code 0 R Current 0 R Unacknowledged 0 R Unreported 0 R Disabled 0 R/W Automatic Acknowledge

Option

0R/W

Operation—Foundation Fieldbus

Table 13 Bus parameters/analog input blocks (AI) (continued)

Parameter Description Default R/W

LO_LIM Low Limit –INF R/W LO_LO_PRI Low Low Priorit y 0 R/W LO_LO_LIM Low Low Limit –INF R/W

Unacknowledged 0 R/W

HI_HI_ALM

HI_ALM

LO_ALM

LO_LO_ALM

Alarm State 0 R Time Stamp 0 R Sub-code 0 R Value 0 R Unacknowledged 0 R/W Alarm State 0 R Time Stamp 0 R Sub-code 0 R Value 0 R Unacknowledged 0 R/W Alarm State 0 R Time Stamp 0 R Sub-code 0 R Value 0 R Unacknowledged 0 R/W Alarm State 0 R Time Stamp 0 R Sub-code 0 R Value 0 R

Operation—Foundation Fieldbus

6.2.2.6 Cyclic measured value status

The cyclic measured value status is shown in Table 14.

Table 14 Cyclic measured value status

Priority Quality Sub-status

Low

Good

Uncertain

Bad

High Out of Service 00 01 11 xx 0 x 1C

Good Non-Specific 10 00 00 00 0 x 80 Good Active Advisory Alarm 10 00 10 xx 0 x 88 Good Active Critical Alarm 10 00 11 xx 0 x 8C Uncertain Non-Specific 01 00 00 xx 0 x 40 Last Usable Value (LUV) 01 00 01 xx 0 x 44 Substitute-Set 01 00 10 xx 0 x 48 Initial Value 01 00 11 xx 0 x 4C Sensor Conversion Not Accurate 01 01 00 xx 0 x 50 Engineering Unit Violation 01 01 01 xx 0 x 54 Sub-Normal 01 01 10 xx 0 x 58 Non-Specific 00 00 00 xx 0 x 00 Sensor Failure 00 01 00 xx 0 x 10 Device Value 00 00 11 xx 0 x 0C

Bin-coding (no limit bits)

6.2.2.7 Measured value limits—limit bits

The respective status bit is set when a condition occurs (Table 15). The status bit is reset when the condition no longer exists.

Table 15 Limit bit description

Bin coding of limit bits Description

00 OK 01 Low-limited 10 High-limited 11 Constant

Hexcoding

Operation—Foundation Fieldbus

Range

The revision value is

incremented every

time a static

parameter in the

block is changed.

Data

type

6.2.3 Transducer block

The transducer block provides for acyclic data transmission. Calibration, configuration, and

maintenance commands coming from the control station are processed in the Transducer

Table 16 Transducer block bus parameters

Block. The bus parameters for the transducer block (TB) are shown in Table 16 (default values

are in bold type).

The revision of the static data

associated with the function

block. Used by the host to

Parameter Description R/W Bytes

ST_REV

determine when to re-read the

R/W 32 Default: Text

static data.

The user description of the

intended application of the

TAG-DESC

block.

R/W 2 Default: 0

The strategy field can be used

to identify a grouping of blocks.

STRATEGY

Can be used for any purpose

by the user.

Identification number that may

R/W 1 Default: 0

be used by the host system to

sort alarms and other device

information.

ALERT_KEY

Operation—Foundation Fieldbus

Available modes:

Automatic, Out Of

Service

Range

Data

type

(OOS), Manual

Default: 0

Allows the user to set the

Target, Permitted, and Normal

111

R/WRR/W

device mode. Displays the

R/W

Actual mode.

Target

Actual

Permitted

Normal

Reflects the error status

associated with the hardware or

11822

software of the block. It is a bit

string so multiple errors may be

shown.

Unacknowledged Update Stat e

Time St amp S t atic Rev Relative

Index

11821

Unacknowledged Alarm State

Time Stamp Subcode Value

Table 16 Transducer block bus parameters (continued)

Parameter Description R/W Bytes

MODE_BLK

BLOCK_ERR

UPDATE_EVENT

BLOCK_ALM

Range

Data

type

Operation—Foundation Fieldbus

Default: 65535 =

other

0 = pH

1 = ORP

DS-65

Directory that specifies the

number and the starting indices

of the transducers in the

transducer block.

R1 Default: 0

A transducer block sub-code.

XD_ERROR contains the

highest priority alarm that has

been activated in the

TB_DETAILED_STATUS

parameter.

A directory that specifies the

R36

number, starting indices, and

DD item of IDs of the data

collection in each transducer

within a transducer block. Used

by the host for efficient transfer

of information.

Shows the pH value and status

Value

Status

Table 16 Transducer block bus parameters (continued)

TRANSDUCER_

6.2.4 Calibration via Foundation Fieldbus

The transmitter can be calibrated via Foundation Fieldbus using the comparison or grab sample method.

1. Make sure the system is configured for pH

(PRIMARY_VALUE_TYPE = pH).

2. Collect a grab sample and set CAL_SAMPLE_PRD_PH to sample. The pH value of the sample is stored. After writing, the parameter is automatically reset to NOP (no operation).

3. Read the parameter CAL_SAMPLE_PRD_PH_STORED_VAL. It contains the stored value.

4. Measure the grab sample and write the lab value in CAL_PRODUCT_PH. The device is now calibrated. CAL_SAMPLE_PRD_PH_STORED_VAL is reset to zero.

Note: Calibration values can also be entered directly in the CAL_SLOPE_PH and CAL_ZERO_PH parameters.

ORP

1. Make sure the system is configured for ORP

(PRIMARY_VALUE_TYPE = ORP).

2. Collect a grab sample and set CAL_SAMPLE_PRD_ORP to sample. The ORP value of the sample is stored. After writing, the parameter is automatically reset to NOP (no operation).

3. Read the parameter CAL_SAMPLE_PRD_ORP_STORED_VAL. It contains the stored value.

4. Measure the grab sample and write the lab value in CAL_PRODUCT_ORP. The device is now calibrated. CAL_SAMPLE_PRD_ORP_STORED_VAL is reset to zero.

Section 7 Operation—Profibus PA

The following section describes how to operate the si792x P-PA transmitter. The transmitter can be operated as follows:

• Direct interface with the transmitter (section 7.1)

• Profibus PA communication (section 7.2 on page 65)

Note: Calibration must be completed by direct interface with the transmitter.

7.1 Configuration

Use the configuration mode to specify the sensor, range and other parameters for the system.

7.1.1 Configuration steps

1. Press MEAS + CAL and enter 1200 to enter the configuration

mode.

2. Use the arrow and enter keys to change the settings. All settings and options are shown in section 7.1.2.

To exit the configuration mode at any time, press MEAS + CAL and then

ENTER. The Hold mode will be active for 20 seconds and then the

measured value will be displayed.

Note: During configuration the transmitter remains in the Hold mode for safety reasons. The Sensoface icon is inactive. The configuration mode indicator is displayed (Figure 11 on page 33).

Operation—Profibus PA

7.1.2 Configuration menu

Select process variable pH/mV

pH (default) Range: 0.00–14.00 A change of the process variable mV Range: –1500–1500

Select the temperature unit

Auto °C (default) The measurement and

Auto

man

manAuto

Select the temperature sensor (auto)

Enter temperature of sensor (man)

Select Sensocheck

Auto °F man °C

man °F °C Auto man Recorded automatically during

°F Auto man

PT100 PT1000 (default for EU version) 300 NTC (default for standard version with pHD and LCP sensors)

BUS EXT

xxx.x °C (default: 025.0 °C) xxx.x °F

CHECK ON CHECK OFF (default)

requires a complete configuration

calibration are automatically recorded when the temperature sensor is connected

Manual input during measurement and calibration

measurement Manual input during calibration

External temperature during measurement (°C)

Manual input during calibration (°C)

Continuous Sensocheck evaluation of sensor function

Operation—Profibus PA

7.1.2 Configuration menu (continued)

Select the calibration mode

-01-BUF

-02-BUF

-03-BUF Ciba (94)

-04-BUF

-05-BUF

-06-BUF (default)

-07-BUF

-08-BUF Hamilton DAT

MAN

Enter cal timer interval

0000–9999 h (default: 0000 h (Off))

Enter Profibus address

Edit 0001–0126 (default: 0126)

Knick /Mettler Toledo

Merck Titrisols, Riedel Fixanals

NIST technical buffers

NIST standard buffers

HACH buffers WTW technical

buffers

Calibration mode: Automatic with Calimatic

Direct entry of zero and slope of premeasured electrodes

Calibration with manual buffer entry

Make sure that the transmitter is not communicating via Profibus

7.2 Profibus communication

Profibus uses a master/slave data exchange technique. The master (typically a PLC) generates queries to individual slaves. The slaves, in turn, reply back with a response to the master. A Profibus message contains the information required to send a query or request, including the slave address, function code, data, and a checksum. See Table 17

on page 66 for Profibus communication parameters.

Operation—Profibus PA

Logbook

(default)

Text of binary message

(default)

Physical Block

(PB)

Global status

Analog input

status

Table 17 PROFIBUS communication

No. of

binary

message

1 0000 11xx Failure ERR SYSTEM Yes

2 0000 11xx Failure ERR PARAMETERS Yes

Failure ERR PH VALUE Yes

0100 0111

0100 1111

3 0000 11xx Failure ERR MEMORY Yes

CHK ZERO/SLOPE Yes

CHK EL. RESPONSE Yes

Failure ERR MV VALUE Yes

Failure ERR TEMP VALUE Yes

Failure CHK GLASS EL. Yes

Failure CHK REF. EL. Yes

Maintenance

req.

Maintenance

req.

0100 0111

0100 1111

0100 0111

0100 1111

0100 0111

0100 1111

0100 0111

0100 1111

10 0101 00xx

Cause

Factory settings

defective

Configuration data

defective, Gaincheck

Memory error

(RAM, ROM,

EPROM)

pH range violation

(pH electrode)

mV range violation

(redox

electrode)

Temp range violation

Temperature probe

Sensocheck Glass

electrode

Sensocheck

Reference electrode

Zero point/Slope 9 0101 00xx

Electrode response

time

Operation—Profibus PA

Logbook

(default)

CAL REQUIRED

Text of binary message

(default)

Maintenance

req.

Function check CAL RUNNING

0100 0111

Calibration 12

Function check CONF RUNNING

0100 1111

0100 0111

Configuration 13

0100 1111

HOLD

Physical Block

(PB)

Global status

Analog input

status

No. of

binary

Table 17 PROFIBUS communication (continued)

message

11 0101 00xx

Calibration timer

Cal prompt

Cause

HI_HI_LIMIT PH

HI_HI_LIMIT MV

HI_LIMIT PH

HI_LIMIT MV

LO_LIMIT PH

LO_LIMIT MV

LO_LO_LIMIT PH

LO_LO_LIMIT MV

Function check HOLD X

Limit 1

Bit 1

Limit 1

Bit 2

Limit 1

Bit 3

Limit 1

Bit 4

0100 0111

0100 1111

(Device state =

Maintenance)

15 1000 1110

HI_HI_LIM

FB analysis

16 1000 1010

17 1000 1001

18 1000 1101

mV/mV

HI_LIM

FB analysis

mV/mV

LO_LIM

FB analysis

mV/mV

LO_LO_LIM

FB analysis

mV/mV

Operation—Profibus PA

Logbook

(default)

HI_HI_LIMIT TEMP

HI_LIMIT TEMP

LO_LIMIT TEMP

Limit 2

21 1000 1001

Bit 3

Limit 2

LO_LO_LIMIT TEMP

Bit 4

22 1000 1101

Text of binary message

(default)

Limit 2

Bit 1

Limit 2

Physical Block

(PB)

Global status

Analog input

status

No. of

binary

Table 17 PROFIBUS communication (continued)

message

Bit 2

19 1000 1110

20 1000 1010

Cause

HI_HI_LIM

FB temperature

HI_LIM

FB temperature

LO_LIM

FB temperature

LO_LO_LIM

FB temperature

Logbook empty 23 Function check EMPTY LOGBOOK

Section 8 Calibration

8.1 Calibration

The transmitter is adjusted to the probe through the calibration. The available calibration methods are shown in Table 18.

Table 18 Calibration methods and passcodes

Method Passcode

pH or ORP calibration by method specified in configuration menu (Table 9 on page 40)

Adjustment of temperature probe 1015 Cal info 0000

pH or ORP calibration by comparison

Zero pH adjustment (for ISFET type probes only)

During calibration the transmitter remains in the Hold mode for safety reasons. The loop current is frozen at the value specified in the o1.HoLD menu option. The Sensoface icon is inactive. The calibration mode indicator is displayed (Figure 11 on page 33).

To exit the calibration mode at any time, press The output current will be held for 20 seconds and the measured value will be displayed.

8.1.1 pH calibration

The pH probe can be calibrated by automatic buffer recognition, by manual buffer entry or by comparison to an alternate measurement method. A one-point or two-point calibration is accepted when buffer solutions are used. If calibration data is available for the probe, the slope and offset can be entered.

ISFET probes or probes with an offset or isopotential other than pH 7 require an offset adjustment before calibration.

1100

1105 (not available with si792x P-PA)

1001 (not available with si792x P-PA)

CAL and then ENTER.

Calibration

Note: Calibrations must be performed by trained personnel. Incorrectly set parameters may result in errors in sample measurements.

Note: To reduce the response time of the probes, briefly stir the buffer solution with the probe and then hold it still.

8.1.1.1 Calibration with automatic buffer recognition

The buffer solutions selected in the configure menu (section 5.2.3 on

page 40) must be used during calibration for accurate results. Other

buffer solutions, even those with the same nominal pH values, may show a different temperature dependence and result in measurement errors.

Complete the following steps to calibrate the pH probe:

1. Press

2. Remove the pH and temperature probes from the process. Clean

3. Press

4. When CAL2 is displayed, remove the probes from the first buffer

5. Complete a one-point calibration or start a two-point calibration:

CAL, enter passcode: 1100, ENTER. The display will show

CAL1.

the probes and immerse in the first buffer solution (any order). Briefly stir the solution with the probes.

ENTER. Automatic recognition of the buf fer solution will begin.

The display will first show the hourglass and no buffer value, then the recognized buffer value followed by the measured millivolt value. When the measurement is complete, the display will show CAL2.

solution and rinse thoroughly.

• One-point calibration: press slope (%) and offset (mV) of the probe (based on 25 °C) will be displayed.

• Two-point calibration: immerse the probes in the second buffer solution. Press

ENTER. The buffer detection will repeat as for the

CAL to end the calibration. The

Calibration

first buffer solution. When complete, the slope (%) and offset (mV) of the probe (based on 25 °C) will be displayed.

6. Press

7. Remove the probes from the buffer, rinse and return to the process.

8.1.1.2 Calibration with manual buffer entry

For calibration with manual buffer specification, the pH value of the buffer solution at the proper temperature must be entered. This calibration allows for calibration with any buffer solution.

Be sure that manual calibration is selected in the configure, cal menu (section 5.2.3 on page 40).

1. Press

2. Remove the pH and temperature probes from the process. Clean

3. Press

4. Press

5. Complete a one-point calibration or start a two-point calibration:

ENTER, ENTER to return to the measurement mode. The

HOLD mode will remain active for 20 seconds.

CAL, enter passcode: 1100, ENTER. The display will show

CAL1.

the probes and immerse in the first buffer solution (any order). Briefly stir the solution with the probes.

ENTER. Use the UP ARROW and RIGHT ARROW to edit the

displayed pH value to match the pH of the buffer solution at the selected temperature.

ENTER. Measurement of the buffer solution will begin. When

measurement is complete, the display will show CAL2.

• One-point calibration: press slope (%) and offset (mV) of the probe (based on 25 °C) will be displayed.

• Two-point calibration: immerse the probes in the second buffer solution. Press second buffer solution and press

ENTER. Edit the displayed pH value to match the

CAL to end the calibration. The

ENTER. Measurement of the

Calibration

buffer solution will begin. When complete, the slope (%) and offset (mV) of the probe (based on 25 °C) will be displayed.

6. Press

7. Remove the probes from the buffer, rinse and return to the process.

8.1.1.3 Enter calibration data from calibrated probes

If the slope and offset of a probe have been determined from a prior calibration, these values can be entered into the transmitter.

Be sure that DAT is selected in the configure, cal menu (section 5.2.3

on page 40).

1. Press

2. Enter the offset mV value of the probe. Press

3. Enter the slope value of the probe in percent (%). Table 19 shows

4. Press

ENTER, ENTER to return to the measurement mode. The

HOLD mode will remain active for 20 seconds.

CAL, enter passcode: 1100, ENTER. The display will show

CAL and then a screen for offset (mV) entry.

ENTER. The value of

the slope (%) will be displayed.

the slope in percent vs. mV/pH unit for reference. Press slope (%) and offset (mV) of the probe will be displayed.

ENTER, ENTER to return to the measurement mode. The

HOLD mode will remain active for 20 seconds.

Table 19 Slope in % vs. mV/pH unit

Slope (%) Slope (mV/pH)

78 46.2 80 47.4 82 48.5 84 49.7 86 50.9 88 52.1 90 53.3 92 54.5

ENTER. The

Calibration

Table 19 Slope in % vs. mV/pH unit (Continued)

Slope (%) Slope (mV/pH)

94 55.6 96 56.8

98 58.0 100 59.2 102 60.4

8.1.1.4 Calibration by comparison— si792 (x) P (HART) and si792x P-FF only

The probe can be calibrated by entering the sample value from measurement in an instrument such as a laboratory or portable meter (one-point calibration). The probe does not need to be removed from the process during calibration. The sample temperature should correspond to the measured process temperature for accurate results.

1. Press

2. Collect a grab sample for measurement in the lab. Press

3. Measure the grab sample with a laboratory or portable meter.

4. Press

5. Edit the displayed value to match the value measured by the

CAL, enter passcode: 1105, ENTER. The display will briefly

show CAL PRD and then StorE.

ENTER to

store the sample value in the transmitter.

The cal mode indicator will flash to indicate that calibration is not complete. The transmitter will continue to measure and display the current sample values.

CAL, enter passcode: 1105, ENTER to access the product

calibration once more. The display will briefly show CAL PRD and then CALC.

laboratory or portable meter and press

ENTER. The slope and offset

will be shown.

Calibration

6. Press

7. Press

Note: For comparison calibration via Foundation Fieldbus, see

section 8.1.1.4 on page 73.

8.1.1.5 Zero adjustment for ISFET probes—For si792(x) P (HART)

The nominal zero point must be adjusted each time a new ISFET or probe with an offset or isopotential other than pH 7 is connected. If not adjusted, the Sensoface messages will not be accurate. Complete the following steps to adjust the zero point.

1. Press

2. Place the pH probe in a pH 7.00 buffer solution. Briefly stir the

3. Enter the temperature-corrected pH value of the buffer solution. The

4. The transmitter will measure the mV reading of the probe. The

5. Press

After adjusting the zero offset, be sure to calibrate the probe by following one of the available procedures:

ENTER to end the calibration. The display will show the

measured value alternating with Hold.

ENTER to return to the measuring mode. The outputs will

remain in the hold mode for approximately 20 seconds.

and si792x P-FF only

CAL, enter passcode: 1001, ENTER. The display will show

CAL ZRO and then the pH value for the zero point.

solution with the probe.

value must be between 6.50 and 7.50 pH. Press the value.

hourglass will flash. When complete, the mV value of the zero offset of the probe will be displayed. Press

ENTER to end the zero adjustment.

• Automatic buffer recognition

• Manual buffer entry

• Product comparison method

• Data entry

ENTER.

ENTER to save

Calibration

8.1.2 ORP calibration

The ORP probe is calibrated using an ORP (redox) standard solution. The probe can also be calibrated by product comparison (section 8.1.1.4 on page 73).

During calibration, the difference between the measured potential and the specified potential of the calibration standard is determined. In the measurement mode, this difference is added to the measured potential to obtain the displayed potential (equation (1)).

(1)

ORP

where:

= displayed ORP

ORP

= direct probe potential

meas

ΔmV = delta value, determined during calibration The probe potential can also be related to another reference system such as the standard hydrogen probe. In this case the temperaturecorrected potential (Table 20) of the reference probe used must be entered during calibration. During measurement, this value is then added to the measured potential.

Temperature

(°C)

0 249 224 –559 672 10 244 217 –564 664 20 240 211 –569 655 25 236 207 –571 651 30 233 203 –574 647 40 227 196 –580 639 50 221 188 –585 631 60 214 180 –592 623

meas

mVΔ+=

Table 20 Temperature-corrected potential of

commonly used reference systems

Ag/AgCl/KCl

1 mol/L

Δ mV)

(

Ag/AgCl/KCl

3 mol/L

(Δ mV)

Thalamid

(

Δ mV)

Mercuric

sulfate

Δ mV)

(

Calibration

Table 20 Temperature-corrected potential of

commonly used reference systems (Continued)

Temperature

(°C)

70 207 172 –598 613 80 200 163 –605 603

Ag/AgCl/KCl

1 mol/L (

Δ mV)

Be sure that ORP is selected in the Configure, Output menu (section 5.2.1 on page 36).

Be sure that the measurement and calibration temperature are the same. The temperature behavior of the reference probe is not automatically taken into account.

Complete the following steps to calibrate the ORP probe:

1. Press

CAL, enter passcode: 1 100, ENTER. The display will show the

mV screen to be edited.

2. Remove the ORP and temperature probes from the process. Clean the probes and immerse in the redox standard. Briefly stir the solution with the probes.

3. Enter the millivolt value of the redox standard solution.

4. Press

5. Press

ENTER. The display will show the delta mV value. ENTER. The display will show the measured mV value

alternating with Hold.

6. Press

ENTER to return to the measurement mode.

7. Remove the probes from the solution, rinse and return to the

process. The HOLD mode will remain active for 20 seconds.

Ag/AgCl/KCl

3 mol/L (

Δ mV)

Thalamid

(

Δ mV)

Mercuric

sulfate (

Δ mV)

Calibration

8.2 Temperature probe adjustment

Calibration of the temperature probe is advisable, especially for the Pt100 temperature probe.

1. Press

2. Measure the process temperature with an external thermometer.

3. Use the

4. Press

5. The transmitter remains in HoLD mode. Press

Note: Repeat input of the process temperature value when “Err” is displayed.

CAL, enter passcode: 1015, ENTER. CALTMP will be

displayed for 3 seconds. The process temperature will be shown.

UP ARROW and RIGHT ARROW to enter the value of the

temperature from the external thermometer.

ENTER to save the value.

ENTER again.

The transmitter remains in HoLD mode for approximately 20 seconds after calibration and returns to the measurement mode.

Calibration

Section 9 Maintenance

DANGER

Explosion hazard. Only qualified personnel should conduct the tasks described in this section of the manual.

DANGER Electrostatic hazard. Follow the instructions in section on page 20 before conducting any maintenance tasks.

9.1 Cleaning the instrument

Use only a moistened antistatic, lint-free cloth to remove dust, dirt and spots from the external surfaces of the transmitter. Use a mild household cleaner if necessary.

9.2 Sensor maintenance

Refer to the user manual supplied with each sensor for specific cleaning requirements.

Maintenance

Section 10 Troubleshooting

10.1 Sensoface

The Sensoface feature is active whenever Sensocheck is active. This feature monitors the electrode for defects in the sensor or cable, and indicates the maintenance status of the sensor (Table 21).

Table 21 Sensoface description

Sensoface Description

The probe is functioning properly.

The offset and slope of the probe are acceptable, but will require replacement soon.

The offset and slope of the probe have reached values which no longer ensure proper calibration or the pH probe is defective due to a broken glass pH bulb. Replace the electrode.

10.2 Sensocheck

The Sensocheck feature monitors the sensor electrodes and wires for open circuits. Table 22 shows the probe types that Sensocheck monitors. When problems are detected, the error message “Err 33” is displayed, along with an icon corresponding to the type of problem.

Sensocheck can be switched off in the configuration menu.

Note: For confirmation a Sensoface is displayed after calibration. Note: Set Sensocheck to off when a fast response time is required.

Table 22 Sensocheck and electrode types

Electrode type Measure probe Reference probe

Sensocheck on

1 Not available in EU

pH/ORP On On

pHD

Off Off

Troubleshooting

10.3 Error codes

Table 23 describes the error codes.

Table 23 Error codes

Code Description Corrective action

Make sure that the correct probe is connected to the transmitter.

Make sure that the probe has sufficient electrolyte.

Make sure that the probe is in solution.

Replace probe and cable. Make sure that the correct

probe is connected to the transmitter.

Make sure that the probe is in solution.

Replace probe and cable. Check the temperature

sensor wiring. Make sure that the correct

temperature sensor selection in the configuration menu. (NTC300 for pHD and LCP sensors)

Measure resistance of the temperature sensor in the probe. For pHD and LCP sensors, resistance between the black and yellow wires should be 250–350 ohms.

Check the loop power supply voltage to the transmitter.

Make sure of the current output selection (Table 7 on

page 36).

ERR 01

ERR 02

ERR 03

ERR 11

ERR 12

pH value flashes; measured pH value is <–2 or >16 or measured potential is <–1500 or >1500 mV.

ORP value flashes; measured ORP value is <– 1900 or >1900 mV

Temperature probe icon flashes; open or short circuit; temperature range exceeded

Current output icon flashes; current is below 3.8 mA

Current output icon flashes; current is above 20.5 mA

Troubleshooting

Table 23 Error codes (Continued)

Code Description Corrective action

ERR 13

ERR 33

ERR 34

ERR 98

ERR 99

Current output icon flashes; reading range value set too large or too small

Sensocheck icon flashes; error with glass pH probe

Sensocheck icon flashes; error with reference electrode

CONF flashes; configuration or calibration data is defective. Memory error in the program.

FAIL flashes; EEPROM or RAM defective

Check the range settings (Table 7 on page 36)

First calibrate the transmitter. If error repeats check the following steps.

Make sure of the configuration settings.

Clean connection terminals and probe cap.

Replace probe and cable. Clean connection terminals

and probe cap. Replace probe and cable. Jumper between terminal 4

and 5 is missing (combination sensors only)

Return to the factory for repair and calibration.

Troubleshooting

10.4 Calibration errors

Table 24 describes the calibration error messages.

Table 24 Calibration error messages

Display Description Corrective action

Make sure that the buffer used matches the buffer specified in configuration.

Replace the buffer solution. Make sure that the pH probe

has a offset potential of approximately 0 mV in a pH 7 buffer solution; if not adjust the zero (page 74).

Make sure that the temperature probe is immersed in buffer solution (for automatic temperature compensation).

Make sure of the temperature specification in configuration.

Replace the probe. Make sure that the buffer

used matches the buffer specified in configuration.

Replace the buffer solution. Make sure that the

temperature probe is immersed in buffer solution (for automatic temperature compensation).

Make sure of the temperature specification in configuration.

Replace the probe.

Zero error icon

Slope error icon

Offset potential of pH probe in pH 7 buffer is out of range (± 60 mV)

Slope of pH probe is out of range (80–103%)

Troubleshooting

Table 24 Calibration error messages (Continued)

Display Description Corrective action

Make sure that the buffer(s) used match the buffer(s) specified in configuration.

For manual calibration, make sure that the correct buffer is used as specified.

CAL ERR with calibration error icon

CAL ERR with calibration timer icon

Buffer recognition problem; mV value not correct for specified buffer or mV values are similar for 2 buffers.

Calibration canceled due to large drift in mV reading.

Replace the buffer solution(s).

Make sure of the temperature specification in configuration.

Make sure that the correct probe is connected to the transmitter.

Clean the probe. Replace the probe. Make sure that the buffer(s)

used match the buffer(s) specified in configuration.

Replace the buffer solution(s).

Make sure that the temperature of the buffer solution does not change during measurement.

Make sure that the cable is sufficiently shielded from strong electric fields.

Make sure that the probe has electrolyte.

Clean the probe. Replace the probe.

Troubleshooting

10.5 Diagnostic functions

Table 25 lists the diagnostic functions.

Table 25 Diagnostic functions

Function Description

View the output current

View calibration data

View the last error message

View the uncorrected probe potential (sensor monitor)

Specify output current

From the measuring mode, press current will show in the main display for five seconds, then return to measuring mode.

From the measuring mode, press ‘0000’. The slope will show in the main display and the zero current will show in the secondary display . Af ter 20 seconds, the transmitter will return to the measuring mode, or press

ENTER to return immediately to the measuring mode.

From the measuring mode, press ‘0000’. The last error message will show for 20 seconds, or

ENTER to return immediately to the measuring mode.

press After viewing the error , the message will be deleted.

From the measuring mode, press ‘2222’. The measured (uncorrected) potential will show in the main display. Press measurement mode.

From the measuring mode, press ‘5555’. The measured current will show in the secondary display. The output current in the main display can be modified.

To change the output current:

1. Select the current value with the

2. Edit the number using the

ENTER to confirm. The entered value will show in

3. Press

the secondary display. The transmitter will remain in Hold mode.

4. To exit Hold mode, press measuring mode.

ENTER. The output

CAL and enter passcode

CONF and enter passcode

ENTER to return to the

CONF and enter passcode

RIGHT ARROW key.

UP ARROW key.

CONF, then ENTER to return to

Section 11 Parts and accessories

11.1 si792 P series versions

Description Catalog number si792(x) P standard versions

si792 P, pH/ORP, C1D2 LXV500.99.70012 si792x P, pH/ORP, C1D1; ATEX Zone 1 LXV500.99.70112 si792x P-PA, pH/ORP, C1D1; ATEX Zone 1 LXV500.99.76112 si792x P-FF, pH/ORP, C1ID1; ATEX Zone 1 LXV500.99.77112

si792(x) P EU versions

si792 P, pH/ORP, C1D2 LXV500.99.70002 si792x P, pH/ORP, C1D1; ATEX Zone 1 LXV500.99.70102 si792x P-PA, pH/ORP, C1D1; ATEX Zone 1 LXV500.99.76102 si792x P-FF, pH/ORP, C1ID1; ATEX Zone 1 LXV500.99. 77102

Standard models are not availa ble in the EU. Standard models contain default settings for Hach pHD and LCP sensors. Default settings can be changed by the user.

Available in the EU only. EU models contain default settings for pH/ORP combination electrodes with PT1000. Default settings can be changed by t he user.

11.2 Accessories

Description Catalog number

Installation Kit,si792 LZY486 Panel-Mount Installation Kit, si792 LZY484 Pipe-Mount Installation Kit, si792 LZY483 Protective Hood, si792 LZY485 Rear Housing, si792, LZY487 si792 P pH/ORP Manual, English DOC026.52.00794 si792 Series Complete Documentation on CD DOC086.98.00794

Parts and accessories

Section 12 Contact information

HACH Company World Headquarters

P.O. Box 389 Loveland, Colorado 80539-0389 U.S.A. Tel (800) 227-HACH (800) 227-4224 (U.S.A. only) Fax (970) 669-2932 orders@hach.com www.hach.com

Repair Service in Latin America, the Caribbean, the Far East, Indian Subcontinent, Africa, Europe, or the Middle East:

Hach Company World Headquarters, P.O. Box 389 Loveland, Colorado, 80539-0389 U.S.A. Tel +001 (970) 669-3050 Fax +001 (970) 669-2932 intl@hach.com

HACH LANGE LTD

Unit 1, Chestnut Road Western Industrial Estate IRL-Dublin 12 Tel. +353(0)1 46 02 5 22 Fax +353(0)1 4 50 93 37 info@hach-lange.ie www.hach-lange.ie

Repair Service in the United States:

HACH Company Ames Service 100 Dayton Avenue Ames, Iowa 50010 Tel (800) 227-4224 (U.S.A. only) Fax (515) 232-3835

HACH LANGE GMBH

Willstätterstraße 11 D-40549 Düsseldorf Tel. +49 (0)2 11 52 88-320 Fax +49 (0)2 11 52 88-210 info@hach-lange.de www.hach-lange.de

DR. BRUNO LANGE GES. MBH

Industriestraße 12 A-3200 Obergrafendorf Tel. +43 (0)27 47 74 12 Fax +43 (0)27 47 42 18 info@hach-lange.at www.hach-lange.at

Repair Service in Canada:

Hach Sales & Service Canada Ltd. 1313 Border Street, Unit 34 Winnipeg, Manitoba R3H 0X4 Tel (800) 665-7635 (Canada only) Tel (204) 632-5598 Fax (204) 694-5134 canada@hach.com

HACH LANGE LTD

Pacific Way Salford GB-Manchester, M50 1DL Tel. +44 (0)161 872 14 87 Fax +44 (0)161 848 73 24 info@hach-lange.co.uk www.hach-lange.co.uk

DR. BRUNO LANGE AG

Juchstrasse 1 CH-8604 Hegnau Tel. +41(0)44 9 45 66 10 Fax +41(0)44 9 45 66 76 info@hach-lange.ch www.hach-lange.ch

Contact information

HACH LANGE FRANCE S.A.S.

33, Rue du Ballon F-93165 Noisy Le Grand Tél. +33 (0)1 48 15 68 70 Fax +33 (0)1 48 15 80 00 info@hach-lange.fr www.hach-lange.fr

HACH LANGE APS

Åkandevej 21 DK-2700 Brønshøj Tel. +45 36 77 29 11 Fax +45 36 77 49 11 info@hach-lange.dk www.hach-lange.dk

HACH LANGE S.L.U.

Edif. Arteaga Centrum C/Larrauri, 1C- 2ª Pl. E-48160 Derio/Vizcaya Tel. +34 94 657 33 88 Fax +34 94 657 33 97 info@hach-lange.es www.hach-lange.es

HACH LANGE S.R.O.

Lešanská 2a/1176 CZ-141 00 Praha 4 Tel. +420 272 12 45 45 Fax +420 272 12 45 46 info@hach-lange.cz www.hach-lange.cz

HACH LANGE SA

Motstraat 54 B-2800 Mechelen Tél. +32 (0)15 42 35 00 Fax +32 (0)15 41 61 20 info@hach-lange.be www.hach-lange.be

HACH LANGE AB

Vinthundsvägen 159A SE-128 62 Sköndal Tel. +46 (0)8 7 9 8 05 00 Fax +46 (0)8 7 98 05 30 info@hach-lange.se www.hach-lange.se

HACH LANGE LDA

Av. do Forte nº8 Fracção M P-2790-072 Carnaxide Tel. +351 214 253 420 Fax +351 214 253 429 info@hach-lange.pt www.hach-lange.pt

HACH LANGE KFT.

Hegyalja út 7-13. H-1016 Budapest Tel. +36 (06)1 225 7783 Fax +36 (06)1 225 7784 info@hach-lange.hu www.hach-lange.hu

DR. LANGE NEDERLAND B.V.

Laan van Westroijen 2a NL-4003 AZ Tiel Tel. +31(0)344 63 11 30 Fax +31(0)344 63 11 50 info@hach-lange.nl www.hach-lange.nl

HACH LANGE S.R.L.

Via Riccione, 14 I-20156 Milano Tel. +39 02 39 23 14-1 Fax +39 02 39 23 14-39 info@hach-lange.it www.hach-lange.it

HACH LANGE SP.ZO.O.

ul. Opolska 143 a PL-52-013 Wrocław Tel. +48 (0)71 342 10-83 Fax +48 (0)71 342 10-79 info@hach-lange.pl www.hach-lange.pl

HACH LANGE S.R.L.

Str. Leonida, nr. 13 Sector 2 RO-020555 Bucuresti Tel. +40 (0) 21 201 92 43 Fax +40 (0) 21 201 92 43 info@hach-lange.ro www.hach-lange.ro

HACH LANGE

8, Kr. Sarafo v str. BG-1164 Sofia Tel. +359 (0)2 963 44 54 Fax +359 (0)2 866 04 47 info@hach-lange.bg www.hach-lange.bg

ΗΑCH LANGE E.Π.Ε.

Αυλίδος 27 GR-115 27 Αθήνα Τηλ . +30 210 7777038 Fax +30 210 7777976 info@hach-lange.gr www.hach-lange.gr

Contact information

HACH LANGE SU ANALİZ SİSTEMLERİ LTD.ŞTİ.

Hilal Mah. 75. Sokak Arman Plaza No: 9/A TR-06550 Çankaya/ ANKARA Tel. +90 (0)312 440 98 98 Fax +90 (0)312 442 11 01 bilgi@hach-lange.com.tr www.hach-lange.com.tr

HACH LANGE E.P.E.

27, Avlidos str GR-115 27 Athens Tel. +30 210 7777038 Fax +30 210 7777976 info@hach-lange.gr www.hach-lange.gr

HACH LANGE D.O.O.

Fajfarjeva 15 SI-1230 Domžale Tel. +386 (0)59 051 000 Fax +386 (0)59 051 010 info@hach-lange.si www.hach-lange.si

Section 13 Warranty, liability and complaints

The manufacturer warrants that the product supplied is free of material and manufacturing defects and undertakes the obligation to repair or replace any defective parts at zero cost.

The warranty period for instruments is 24 months. If a service contract is taken out within 6 months of purchase, the warranty period is extended to 60 months.

With the exclusion of the further claims, the supplier is liable for defects including the lack of assured properties as follows: all those parts that can be demonstrated to have become unusable or that can only be used with significant limitations due to a situation present prior to the transfer of risk, in particular due to incorrect design, poor materials or inadequate finish will be improved or replaced, at the supplier's discretion. The identification of such defects must be notified to the supplier in writing without delay, however at the latest 7 days after the identification of the fault. If the customer fails to notify the supplier, the product is considered approved despite the defect. Further liability for any direct or indirect damages is not accepted.

If instrument-specific maintenance and servicing work defined by the supplier is to be performed within the warranty period by the customer (maintenance) or by the supplier (servicing) and these requirements are not met, claims for damages due to the failure to comply with the requirements are rendered void.

Any further claims, in particular claims for consequential damages cannot be made.

Consumables and damage caused by improper handling, poor installation or incorrect use are excluded from this clause.

The manufacturer process instruments are of proven reliability in many applications and are therefore often used in automatic control loops to provide the most economical possible operation of the related process.

Warranty, liability and complaints

To avoid or limit consequential damage, it is therefore recommended to design the control loop such that a malfunction in an instrument results in an automatic change over to the backup control system; this is the safest operating state for the environment and the process.

Warranty, liability and complaints

Appendix A Buffer tables

Refer to the following tables for pH values of specific buffer sets at varying temperatures.

• 01 Knick/Mettler-T oledo (Ta bl e 26 )• 05 NIST standard (Table 30)

• 02 Merck, Riedel (Table 27) • 06 Hach buffers (Table 31)

• 03 Ciba (94) buffers (Table 28) • 07 WTW buffers (Table 32)

• 04 NIST technical (Table 29) • 08 Hamilton Duracal (Table 33)

Table 26 Knick/Mettler-Toledo technical buffers

°C pH 2pH 4pH 7 pH 9

0 2.03 4.01 7.12 9.52

5 2.02 4.01 7.09 9.45 10 2.01 4.00 7.06 9.38 15 2.00 4.00 7.04 9.32 20 2.00 4.00 7.02 9.26

25 2.00 4.01 7.00 9.21

30 1.99 4.01 6.99 9.16 35 1.99 4.02 6.98 9.11 40 1.98 4.03 6.97 9.06 45 1.98 4.04 6.97 9.03 50 1.98 4.06 6.97 8.99 55 1.98 4.08 6.98 8.96 60 1.98 4.10 6.98 8.93 65 1.99 4.13 6.99 8.90 70 1.99 4.16 7.00 8.88 75 2.00 4.19 7.02 8.85 80 2.00 4.22 7.04 8.83 85 2.00 4.26 7.06 8.81 90 2.00 4.30 7.09 8.79 95 2.00 4.35 7.12 8.77

Buffer tables

Table 27 Merck Titrisols, Riedel Fixanals

°C pH 2 pH 4 pH 7 pH 9 pH 12

0 2.01 4.05 7.13 9.24 12.58

5 2.01 4.04 7.07 9.16 12.41 10 2.01 4.02 7.05 9.11 12.26 15 2.00 4.01 7.02 9.05 12.10

20 2.00 4.00 7.00 9.00 12.00

25 2.00 4.01 6.98 8.95 11.88 30 2.00 4.01 6.98 8.91 11.72 35 2.00 4.01 6.96 8.88 11.67 40 2.00 4.01 6.95 8.85 11.54 45 2.00 4.01 6.95 8.82 11.44 50 2.00 4.00 6.95 8.79 11.33 55 2.00 4.00 6.95 8.76 11.19 60 2.00 4.00 6.96 8.73 11.04 65 2.00 4.00 6.96 8.72 10.97 70 2.01 4.00 6.96 8.70 10.90 75 2.01 4.00 6.96 8.68 10.80 80 2.01 4.00 6.97 8.66 10.70 85 2.01 4.00 6.98 8.65 10.59 90 2.01 4.00 7.00 8.64 10.48 95 2.01 4.00 7.02 8.64 10.37

Buffer tables

Table 28 Ciba (94) buffers

°C pH 2pH 4pH 7 pH 10

0 2.04 4.00 7.10 10.30

5 2.09 4.02 7.08 10.21 10 2.07 4.00 7.05 10.14 15 2.08 4.00 7.02 10.06 20 2.09 4.01 6.98 9.99 25 2.08 4.02 6.98 9.95 30 2.06 4.00 6.96 9.89 35 2.06 4.01 6.95 9.85 40 2.07 4.02 6.94 9.81 45 2.06 4.03 6.93 9.77 50 2.06 4.04 6.93 9.73 55 2.05 4.05 6.91 9.68 60 2.08 4.10 6.93 9.66 65

70 2.07 4.11 6.92 9.57 75

80 2.02 4.15 6.93 9.52 85

90 2.04 4.20 6.97 9.43 95

Extrapolated values

2.07

2.04

2.03

2.05

4.10

4.13

4.17

4.22

6.92

6.95

6.99

9.61

9.54

9.47

9.38

Buffer tables

Table 29 NIST technical buffers

°C pH 2 pH 4 pH 7 pH 10 pH 12

0 1.67 4.00 7.115 10.32 13.42

5 1.67 4.00 7.085 10.25 13.21 10 1.67 4.00 7.06 10.18 13.01 15 1.67 4.00 7.04 10.12 12.8 20 1.675 4.00 7.015 10.06 12.64 25 1.68 4.005 7.00 10.01 12.46 30 1.68 4.015 6.985 9.97 12.3 35 1.69 4.025 6.98 9.93 12.13 40 1.69 4.03 6.975 9.89 11.99 45 1.7 4.045 6.975 9.86 11.84 50 1.705 4.06 6.97 9.83 11.71 55 1.715 4.075 6.97 60 1.72 4.085 6.97

65 1.73 4.1 6.98 70 1.74 4.13 6.99 75 1.75 4.14 7.01 80 1.765 4.16 7.03 85 1.78 4.18 7.05 90 1.79 4.21 7.08 95 1.805 4.23 7.11

Extrapolated values

9.83

1 1 1 1 1 1 1 1

11.57

11.45

1 1 1 1 1 1 1

Hach-Lange SI792 P, SI792x P, SI792x P-FF, SI792x P-PA User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

Section 1 Specifications

Section 2 General information

2.1 Safety information

2.1.1 Use of hazard information

2.1.2 Precautionary labels

2.2 General product information

2.2.1 Product overview

2.2.2 FDA 21 CFR part 11 Compliance (HART only)

2.2.2.1 Electronic signatures for si792 P series transmitters

2.2.2.2 Audit trail for si792 P series transmitters

2.3 Product models

Section 3 Installation

3.1 Hazardous location control drawings

3.2 Unpacking the transmitter

3.3 Mechanical installation

3.3.1 Transmitter assembly

3.3.2 Mounting

3.3.2.1 Wall mount

3.3.2.2 Panel or pipe mount (optional)

3.4 Wiring Safety Information

3.5 Electrical installation

3.5.1 Wire preparation

3.5.2 Power and communication connections

3.5.2.2 si792x P-FF and si792x P-PA wiring

3.5.3 Sensor wire connection

3.5.3.1 Hach combination pH/ORP sensors wiring

3.5.3.2 pH/ORP sensors with solution ground wiring

3.5.3.3 Differential pH/ORP sensor wiring

3.6 HART communication connection

Section 4 Interface and navigation

4.2 si792x P-FF and si792x P-PA interface

4.3 Display

5.1 Measure mode

5.2 Configuration

5.2.1 Output configuration

5.2.1.1 Output range

5.2.1.2 Time averaging filter

5.2.1.3 Output signal during errors

5.2.1.4 Output signal during HOLD

5.2.2 Temperature compensation configuration

5.2.3 Calibration mode configuration

5.2.4 Alarm settings configuration

6.1 Configuration

6.1.1 Configuration steps

6.1.2 Configuration menu

6.2 Foundation Fieldbus communication

6.2.1 Standard resource block (RB)

6.2.2 Standard analog input block (AI)

6.2.2.1 Operating modes

6.2.2.2 Set the parameter and units

6.2.2.3 Data processing

6.2.2.4 Alarms

6.2.2.5 Bus parameters for the analog input block

6.2.2.6 Cyclic measured value status

6.2.3 Transducer block

6.2.4 Calibration via Foundation Fieldbus

7.1 Configuration

7.1.1 Configuration steps

7.1.2 Configuration menu

7.2 Profibus communication

Section 8 Calibration

8.1 Calibration

8.1.1 pH calibration

8.1.1.1 Calibration with automatic buffer recognition

8.1.1.2 Calibration with manual buffer entry

8.1.1.3 Enter calibration data from calibrated probes

8.1.2 ORP calibration

8.2 Temperature probe adjustment

Section 9 Maintenance

9.1 Cleaning the instrument

9.2 Sensor maintenance

Section 10 Troubleshooting

10.1 Sensoface

10.2 Sensocheck

10.3 Error codes