ECD HYDRA Ammonium User Manual

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LECTRO-CHEMICAL DEVICES

Instruction Manual

Hydra Ammonium Analyzer

Rev: E - 07/11

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PREFACE

Purchasing products from Electro-Chemical Devices, Inc. provides you with the finest liquid analytical instrumentation available. If this is your first purchase from ECD, please read this manual before installing and commissioning your new equipment.

If there are any questions concerning this equipment, please contact your local ECD representative, or the factory directly at:

Electro-Chemical Devices, Inc.

1681 Kettering St.

Irvine, CA 92614 USA

Telephone: +1-949-336-6060

FAX: +1-949-336-6064

Website: www.ecdi.com

Email: sales@ecdi.com

© 2010 Electro-Chemical Devices, Inc. All rights reserved. No part of this manual may be used or reproduced in any form or by any means, or stored in a database or retrieval system without prior written permission from Electro-Chemical Devices, Inc. Making copies of any part of this manual for any purpose other than personal use is a violation of United States copyright laws. Document printed in the United States of America.

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TABLE OF CONTENTS

PREFACE ....................................................................................................................................................... iii

TABLE OF CONTENTS .................................................................................................................................... iv

WARRANTY ................................................................................................................................................. vii

IMPORTANT SERVICE INFORMATION ......................................................................................................... vii

1.0 GENERAL DESCRIPTION ........................................................................................................................... 1

1.0.0 Description ................................................................................................................................... 1

1.0.1 Potassium Ion Compensation ...................................................................................................... 1

1.0.2 pH Compensation......................................................................................................................... 1

1.0.3 Temperature Compensation ........................................................................................................ 1

1.0.4 Cleaning and Maintenance .......................................................................................................... 1

1.1 FEATURES ............................................................................................................................................ 2

1.1.1 Features and Benefits .................................................................................................................. 2

1.2 Specifications ...................................................................................................................................... 2

1.2.1 Hydra Sensor ................................................................................................................................ 2

1.2.2 C22 Analyzer ................................................................................................................................ 3

1.3 Hydra Dimensional Drawing ............................................................................................................... 4

1.3.1 Parts List: ...................................................................................................................................... 4

2.0 INSTALLATION ......................................................................................................................................... 5

2.1 UNPACKING ......................................................................................................................................... 5

2.2 ASSEMBLY ........................................................................................................................................... 5

2.2.1 Spray Cleaner ............................................................................................................................... 5

2.2.2 Immersion /Support Tube ............................................................................................................ 5

2.3 MOUNTING ......................................................................................................................................... 6

2.3.1 C-22 Analyzer ............................................................................................................................... 6

2.3.2 Hydra Sensor ................................................................................................................................ 6

2.4 WIRING ................................................................................................................................................ 6

2.4.1 Wiring, power .............................................................................................................................. 6

2.4.2 Wiring, Sensor .............................................................................................................................. 6

2.4.3 Wiring, 4-20 mA Outputs ............................................................................................................. 6

2.4.4 Wiring, Contact Relay Outputs ..................................................................................................... 7

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3.0 OPERATION ............................................................................................................................................. 9

3.1 KEYS ..................................................................................................................................................... 9

3.2 MENUS .............................................................................................................................................. 10

3.2.1 Ammonium Ion Channel 1 Menu Structure ............................................................................... 10

3.2.2 Potassium Ion Channel 2 Menu Structure ................................................................................. 10

3.2.3 pH Channel 3 Menu Structure ................................................................................................... 10

3.2.4 Graphical Display Screen ............................................................................................................ 10

3.2.5 Buffer Menu ............................................................................................................................... 11

3.2.6 Set-Up Menu .............................................................................................................................. 11

3.2.7 Status Menu ............................................................................................................................... 14

3.2.8 Configuration and Trim Menu.................................................................................................... 14

3.3 OUTPUTS ........................................................................................................................................... 14

3.3.1 Manual Mode (4-20 mA Hold Function) .................................................................................... 15

3.4 CONTACTS-ALARM RELAYS ............................................................................................................... 15

3.4.1 Standard Configuration .............................................................................................................. 15

3.4.2 One AC10 with Two HYDRAs ...................................................................................................... 16

3.5 ION SELECTIVE FEATURES ................................................................................................................. 17

3.5.1 The Isopotential point ................................................................................................................ 17

3.5.2 Potassium Ion Interference Correction ...................................................................................... 17

3.5.3 pH Correction ............................................................................................................................. 17

4.0 START UP ............................................................................................................................................... 18

4.1 SET-UP AND CONFIGURATION .......................................................................................................... 18

4.1.1 Set Up Menus, Standard ............................................................................................................ 18

4.1.2 Set Up Menu, MASTER/SLAVE ................................................................................................... 19

4.1.3 Configure and Trim Menu, Standard ......................................................................................... 20

4.1.4 Configure and Trim Menu, MASTER/SLAVE ............................................................................... 21

4.2 CALIBRATION ..................................................................................................................................... 23

4.2.1 Recommended Materials ........................................................................................................... 23

4.2.2 Temperature Calibration ............................................................................................................ 24

4.2.3 Single point Calibration .............................................................................................................. 24

4.2.4 Two point Calibration ................................................................................................................. 25

4.2.5 Potassium Ion Compensation .................................................................................................... 25

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5.0 MAINTENANCE ...................................................................................................................................... 26

5.1 MAINTENANCE SCHEDULE ................................................................................................................ 26

5.2 CLEANING THE SENSOR ..................................................................................................................... 26

5.3 REPLACING THE ELECTRODES ........................................................................................................... 26

6.0 TROUBLESHOOTING .............................................................................................................................. 27

7.0 ENGINEERING DOCUMENTATION ......................................................................................................... 28

7.1 SPECIFICATIONS ................................................................................................................................ 28

7.2 OUTLINE & DIMENSIONAL DRAWING ............................................................................................... 29

7.2.1 Hydra Sensor Dimensions .......................................................................................................... 29

7.2.2 C-22 Dimensions ........................................................................................................................ 29

7.2.3 Sun Shield Mounting .................................................................................................................. 30

7.3 WIRING DIAGRAM ............................................................................................................................. 31

7.3.1 Sensor Color Coded Diagram ..................................................................................................... 31

7.3.2 Instrument – Terminal Layout/Connections .............................................................................. 31

8.0 ORDERING INFORMATION .................................................................................................................... 33

8.1 PART NUMBERS/MODEL NUMBERS ................................................................................................. 33

8.2 ACCESSORIES ..................................................................................................................................... 33

8.3 SPARE PARTS ..................................................................................................................................... 33

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WARRANTY

Electro-Chemical Devices, Inc. (ECD) warrants all products it manufactures to be free from defect in materials and factory workmanship, and agrees to repair or replace any product that fails to perform, as specified, within one (1) year after date of shipment. This warranty shall not apply to any product that has been:

1. Subjected to misuse, negligence or accident;

2. Connected, installed, adjusted or otherwise used not in accordance with the instructions furnished by ECD;

3. Repaired, modified or altered by persons not authorized by ECD, resulting in injury to the performance, stability or

reliability of the product.

This warranty is in lieu of any other warranty, expressed or implied. ECD reserves the right to make changes in the design or construction of its products at any time, without prior notification, and without incurring any obligation to make any changes in previously delivered products.

Seller’s sole liabilities and the buyer’s sole remedies under this agreement shall be limited to a refund in the purchase price, or at ECD’s discretion, to the repair or replacement of any product that proves, upon ECD’s examination, to be defective, when returned to the factory, transportation prepaid by the buyer, within one (1) year of the product’s original shipment date. Seller shall not be liable for damages consequential or incidental to defects in any product, for failure of delivery in whole or in part, for injuries resulting from its use, or for any other cause.

This warranty and the writing attached constitute the full understanding of seller and the buyer, and no terms, conditions, understanding, or agreement purporting to modify or vary the terms hereof shall be binding unless hereafter made in writing and signed by an authorized official of Electro-Chemical Devices, Inc.

This warranty does not cover pH, ORP or Specific Ion measurement, reference or combination electrodes or electrode cartridges that have been commissioned in service.

IMPORTANT SERVICE INFORMATION

Use only factory authorized components for repair. Tampering or unauthorized substitution of components may adversely affect the operation of this product and may void the warranty.

If service or repair is required, please obtain the serial number(s) or sales order number of the product(s) in question and contact ECD’s Service Department at:

+1-800-729-1333 (USA/Canada) or +1-949-336-6060

or email Service@ecdi.com

A Return Material Authorization (RMA) number must be obtained from the service department before returning any material to ECD. All material returned to ECD shall be shipped prepaid to the factory.

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UNPACKING THE INSTRUMENT

Your Electro-Chemical Devices instrument has been carefully packaged to protect it from damage during shipment and dry storage. Upon receipt please follow the procedure outlined below.

1. Before unpacking, inspect the condition of the shipping container to verify proper handling by

the carrier. If damage is noted, save the shipping container as proof of mishandling for the carrier.

2. Check the contents of the shipping container with the items and quantities shown on the

packing list. Immediately report any discrepancies to ECD.

3. Save the original packing material until you are satisfied with the contents. In the event the

product(s) must be returned to ECD, the packing material will allow you to properly ship it to ECD.

4. Familiarize yourself with the instrument before installation, and follow proper installation and

wiring procedures.

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1.0 GENERAL DESCRIPTION

1.0.0 Description

The HYDRA Ammonium Analyzer measures the concentration of dissolved ammonium as nitrogen (NH determine the NH

-N concentration, an Ammonium Ion Electrode, a Potassium Ion

Electrode and a pH electrode. It is designed for use in all kinds of water. Typical applications include monitoring environmental waters, lakes, streams and wells as well as wastewater treatment in aeration basins and effluent.

1.0.1 Potassium Ion Compensation

The Ammonium Ion Electrode provides the primary measurement. Any potassium ion in the sample, due to its similar size and charge to the ammonium ion, causes a positive interference in the measurement. A Potassium Ion Electrode measures the amount of potassium ion present in the sample and HYDRA C22 Analyzer subtracts the appropriate amount of signal from the Ammonium Measurement.

-N) in water. The sensor uses three electrodes to

1.0.2 pH Compensation

The Ammonium Ion Electrode only measures the ammonium ion (NH

) not

ammonia (NH3). Ammonium ion and ammonia coexist in a pH dependent ratio in solution. At pH 9.2 the ratio is 1:1, at pH 7 nearly all of the ammonia is in the ammonium state and at pH 11 it is nearly all ammonia which is invisible to the sensor. The more acidic values favor the NH

and the more basic values favor

ammonia gas, NH3. The pH Electrode measures the pH and the HYDRA C22 Analyzer calculates the total NH

-N concentration based on the pH vs. concentration profile.

1.0.3 Temperature Compensation

Temperature is also measured and used to compensate each of the three electrode measurements. While the pH electrode response is well defined with respect to temperature the ion electrodes tend to be less well behaved. For the best results calibrate the sensors near the process temperature.

1.0.4 Cleaning and Maintenance

The HYDRA Ammonium Analyzer is configured to

NH3/NH

% concentration vs pH

100

periodically actuate a cleaning cycle using the integral spray cleaner in the sensor. The period and duration of the cleaning cycle is user configurable. The 4-20 mA output is held at either the last value or a preset value during the cleaning. This minimizes the formation biofilms

6 8 10 12

% NH4+

% NH3

HYDRA NH

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or other coatings on the electrodes keeping maintenance to a minimum.

The rugged HYDRA sensor has a 1 ¼” NPT rear facing thread for attaching an extension/immersion tube for easy installation from catwalks or handrails. The HYDRA sensor is submersible with an IP68 degree of ingress protection. A removable electrode guard facilitates easy electrode replacement when necessary. The HYDRA sensor features internal signal conditioning that allows the sensor to be mounted up to 200 meters from the analyzer.

1.1 FEATURES

1.1.1 Features and Benefits

• Separate, economical, easily replaceable Ammonium, Potassium and pH electrodes

• Fast and Accurate Ammonium Measurement NH4+ or NH4+-N

• pH and temperature compensated NH4+-N measurement

• Automatic compensation for K+ interference

• Rugged PVC design with removable electrode guard for easy maintenance

• Integral Spray Head Cleaner

 Cleans sensor in situ with pressurized air

• Internal Signal Conditioning allows up to 200 meters between Sensor and Analyzer

1.2 Specifications

1.2.1 Hydra Sensor

• Three Electrode System with spray cleaner

• Ammonium ISE (NH4+- N) is the primary measurement

• Potassium ISE and pH glass electrodes are used for compensation of the NH4+ signal.

• The Sensor is waterproof with an ingress rating of IP 68.

Measurement Range

• NH4+- N: 0.1 to 1000 ppm

• K+: 0.1 to 10,000 ppm

• pH: 4-12 pH

Operating Temperature

• 0° C to 40° C (32° F to 104° F)

Min/Max Flow Rate by the sensor

• Minimum 0.1 m/s

• Maximum 3.0 m/s

Wetted Materials

• PVC, PES, PVDF, PTFE, Viton, Glass, 316 SS

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Accuracy

• ± 3% of reading, dependent on Calibra0on

Response Time

• T90 approximately 1 minute

Electrode Life

• ISEs: 4- 6 months, typical

• pH electrode: 6-12 months, typical

1.2.2 C22 Analyzer

Measurements

• Ammonium: 0.1 ppb to 1000 ppm as NH4+- N

• Potassium: 0.1 ppb to 1000 ppm

• pH: 0 to 14 pH

• Temperature: 0° C to 100° C (32° F to 212° F)

Compensation

• pH 4 - 12 pH

• Potassium: 0.1 to 1000 ppm

• 0° - 50°C

Display

• 2.5” X 1.75” backlit LCD

• 4 lines of Text

• Graphical display, NH4+-N vs. Time

Enclosure

• NEMA 4X, LxWxD: 5.7” x 5.7” x 7”

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Relay

Standard Configuration

Master

Configuration

Slave Configuration

1 Spray Cleaner

(NO)

PV 1 Alarm

(NO)

NH4-N Alarm

(NO)

2 NH4-N Alarm

(NO)

Digital Input to Slave

(NO)

pH Alarm

(NO)

Spray Cleaner

(NO)

Diverter Valve

(NO)

Outputs

• (2) 4-20 mA maximum load 800 ohms @ 24 VDC

• mA #1: 0.1 to 50 mg/l NH4+- N (User Configurable)

• mA #2: 2 - 12 pH (User Configurable)

• Optionally up to (4) 4-20 mA outputs*

Input Power

• 110/220 VAC @ 50/60 Hz

Alarm Relay Ratings

• SPDT 230 VAC/5A or 30 VDC/5A resistive max. (NO) Normally Open

1.3 Hydra Dimensional Drawing

Figure 1.3

1.3.1 Parts List:

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o HYDRA Sensor with Electrodes, Calibration Cap, o 30’ of ¼” air tubing, Electrode Removal Tool

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2.0 INSTALLATION

2.1 UNPACKING

Carefully remove the HYDRA sensor from its shipping container. Inspect the sensor for damage. Verify the electrodes, Ammonium, Potassium and pH and the Spray Cleaner Nozzle are installed in the sensor housing. The electrodes should be hand tightened into place so that the sealing o-rings are not visible. The electrodes are supplied with protective caps that must be removed before start up. Do not remove the caps until ready to use.

### NEVER SUPPORT THE HYDRA SENSOR BY THE CABLE, IRREPAIRABLE DAMAGE WILL OCCUR ###

2.2 ASSEMBLY

The HYDRA Sensor is shipped completely assembled, before use it must be connected to the analyzer and an air supply. Connect the spray cleaner feed tube to a compressed air supply controlled by a solenoid valve (not supplied). Attach an immersion/support tube (not supplied). Finally connect the sensor wires and 110 VAC power to the analyzer as shown on the wiring diagram. Connect the Cleaner Relay to the solenoid and connect the 4-20 mA Output(s) and Alarm Relay to the Control System, (PLC or DCS). The HYDRA is then ready to use.

2.2.1 Spray Cleaner

The Spray Cleaner uses compressed air to create turbulence around the electrodes which removes dirt and films from the measurement surfaces. Depending on the process being measured the cleaner should be actuated for 15-30 seconds every 0.25 -2 hour period. The spray cleaner connection is a ¼” compression fitting and requires between 25-75 psi air pressure. The air supply is controlled with a user supplied solenoid valve through Relay 1 in the C-22 analyzer. The solenoid valve should be a 110 AC powered, <10 watt device. Wire the solenoid to Relay 1 as described in Section 2.4.4 below.

If no air supply is available use the ECD Model AC10 Air Blast Spray Cleaner compressor. The AC10 uses redundant intake air filters and redundant fuses on both the relays and the compressor. A highly reliable high current contactor assures years of trouble free service. The 115 VAC 3.0 Amp or 220 VAC 1.3 Amp Air Compressor is housed in a rugged, corrosion resistant, hot compression molded, fiberglass reinforced, polyester enclosure with a stainless steel piano hinge to secure the cover to the base. The AC10 can be wall mounted or use the optional 2” handrail mounting system that uses stainless steel support rails with two 2” galvanized pipe clamps.

### NEVER SUPPORT THE HYDRA SENSOR BY THE CABLE, IRREPAIRABLE DAMAGE WILL OCCUR ###

2.2.2 Immersion /Support Tube

Feed the cable and compressed air line through the immersion/support tube (not supplied). Connect a support tube to the 1 ¼” MNPT thread at the rear of the sensor. The Hydra sensor weighs approximately

5.3 lbs. The support tube must be able to support the weight of the HYDRA sensor in the user’s installation, whether vertical or angled. The recommended material for the immersion tube is 1.5” Schedule 80 PVC pipe with a reducer fitting to 1 ¼” FNPT.

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2.3 MOUNTING

2.3.1 C-22 Analyzer

Mount the C-22 in a location where there is easy access to the analyzer and sensors. Install the system in an area where vibrations, electromagnetic and radio frequency interference are minimized or absent. Do not mount in direct sunlight or areas of extreme heat (temperature > 120°F). The NEMA 4X C-22 is suitable for outdoor use but it is best to mount it with a protective cover or sunshield.

There are three basic installation methods for the C-22, Wall Mount (UM), Panel Mount (PM) and Pipe Mount (HM). The Pipe Mounting hardware includes 2” “U” bolts for attaching to standard 2” handrails. (See the installation drawings in Section 9.3 at the rear of the manual)

2.3.2 Hydra Sensor

Install the sensor where the measured sample is representative of the entire process. Although the sensor will function in a quiescent sample, flow improves the measurement. The recommended minimum flow is 0.1 m/sec.

Securely mount the HYDRA sensor with the measuring end at least 6”away from the tank wall and bottom. Ensure that the sensor is immersed at least 6” at all times.

Use care when servicing the sensor to ensure that the sensor does not hit the tank wall or bottom which could break the sensing electrodes.

2.4 WIRING

Electrical wiring should only be conducted by qualified personnel. See the wiring color code for the Hydra Sensor and the C-22 wiring diagram in Section 7.3 below.

2.4.1 Wiring, power

Attach power cable as shown in the diagram in Section 7.3 or the inside of the C22 cover. Feed the cable through the gland fitting on the right hand side of the C-22. Tighten the cable gland to provide a good seal to the cable. The instrument can be powered up at this point with no harm to the analyzer but it is best to wait until the sensors are installed.

2.4.2 Wiring, Sensor

Attach the sensor wires as described on the diagram inside the C22 cover. Feed the sensor cable through the gland fitting on the left hand side of the C-22. Do not use the same gland fitting for the AC power or Alarm/Relays. The green terminal strip connectors are detachable from the circuit boards. Remove the connector by pulling straight back from the circuit board.

2.4.3 Wiring, 4-20 mA Outputs The 4-20 mA output is an unpowered output, 24V can be supplied from an external source, the PLC or

DCS receiving the signal or from the internal PS2 power supply.

If the internal PS2 Power Supply is used, first connect a jumper wire between Terminal #1 (RTN) on the PS2 Power Supply Board and Terminal #2 of the 4-20 mA 1 output connector, the two slot connector on

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the top of the Channel 2 input card. (See diagram in Section 7.3) Then connect a shielded 22 gauge twisted pair communication cable to Terminal #2 (+24V) on the PS2 power supply board and Terminal #1 of the 4-20 mA 1 connector.

If a second mA output is supplied connect it in the same manner, jumper Terminal #1 of the PS2 board to Terminal #2 of the 4-20 mA 2 output terminal strip then connect the two wire communication cable to PS2 Terminal #2 and mA 2 Terminal #1.

If the 4-20 mA loop is powered from an external source then simply connect a shielded 22 gauge twisted pair communication wire to Terminals #1 and #2 of the 4-20 mA terminal on the Channel 2 input card.

The standard Hydra C-22 is configured with the NH4+-N on mA 1 and pH on mA 2.

2.4.4 Wiring, Contact Relay Outputs The standard configuration has two SPDT 230V 5 A relays that can be wired either normally open (NO)

or normally closed (NC). The default configuration is set to use the relays as normally open. Relay 1 actuates the solenoid for the air blast spray cleaner and Relay 2 is an NH

-N alarm relay, either a High or

Low Alarm.

Relay 1

Connect the Line terminal of the 110VAC power to the C (common) terminal of Relay 1. Connect the Cleaner solenoid wires to the neutral terminal of the 110 VAC power and the NO (normally open) terminal of Relay 1. (See Section 7.3)

Relay 2

Wire Relay 2 as a NO relay. Relay 2 is an alarm relay and should be connected to the Control System or an external alarm.

Do not run the cable through the same cable gland fitting as the electrodes or the 4-20 mA signals.

The MASTER configuration has (4) SPDT 230V 5A relays that are wired as normally open (NO) relays.

Relay 1

Wire Relay 1 as a NO relay. Relay 1 is an alarm relay and should be connected to the Control System or an external alarm.

Do not run the cable through the same cable gland fitting as the electrodes or the 4-20 mA signals.

Relays 2 (NO), 3 (NO), 4 (NO)

Connect to AC10 per wiring diagram in AC10 Air Blast Spray Cleaner

The SLAVE configuration has (2) SPDT 230V 5 A relays that are wired as normally open (NO) relays.

Relays 1, 2

Wire Relays 1 and 2 as a NO relays. Relays 1 and 2 are alarm relays and should be connected to the Control System or an external alarm.

HYDRA NH

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Do not run the cable through the same cable gland fitting as the electrodes or the 4-20 mA signals.

Page 8 HYDRA NH

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3.0 OPERATION

This section will provide a basic overview of the C22 Analyzer/Controller. It covers the basic Menu structure, the function of the MENU SELECT keys and the CALIBRATE keys.

The C-22 HYDRA analyzer has three measurement channels:

Channel 1, Ammonium as Nitrogen, NH

Channel 2, Potassium, K+ and

Channel 3, pH

-N,

3.1 KEYS

The blinking cursor indicates the active point where menus can be selected or numerical values adjusted. There are two sets of keys on the C22 analyzer, the MENU SELECT keys and the CALIBRATE keys.

The MENU SELECT keys are used to move the cursor vertically changing the displayed menu. These keys are also used to Save/Accept the calibration data and exit the calibration menu.

The CALIBRATE keys are used to enter menus, change numerical values and move the cursor.

***To enter a calibration menu or parameter adjustment line simultaneously press both of the

Horizontal CALIBRATE keys, ◄CALIBRATE►***

Pressing either of the Horizontal CALIBRATE keys separately will move the cursor horizontally to the point under the digit to be adjusted. The Vertical CALIBRATE keys are used to adjust numeric values. Pressing the upper key will increase the value and pressing the lower key will decrease the value. When the cursor is on a menu line, not in the menu, pressing the down CALIBRATE key will return the cursor to the HOME Screen from any menu.

HYDRA NH

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Screen Displayed

Button Pressed

Home Screen

MENU SELECT

Graphical display

MENU SELECT

Parameter Selection Screen (

Ch 1 Buffer

) MENU SELECT

Parameter Selection Screen

(Ch 1 Set

-Up) MENU SELECT

Parameter

Selection Screen (

Ch 1 Status

) MENU SELECT

Configure/ Trim Menu

MENU SELECT

..... To return to the Home screen

Screen Displayed

Button Pressed

Home Screen

MENU SELECT

pH Manual Mode Screen

MENU SELECT

Parameter Selection Screen (

Ch 2 Status

) MENU SELECT

Parameter Selection Screen (

Ch 2 Set

-Up) MENU SELECT

Parameter Selection Screen (

Ch 2 Buffer

) MENU SELECT

To channel 3

MENU SELECT

….. To return to the Home screen

Screen Displayed

Button Pressed

Parameter Selection Screen (

Ch 2 Buffer

) MENU SELECT

Parameter Selection Screen (

Ch 3

Status

) MENU SELECT

Parameter Selection Screen (

Ch 3

Set-Up)

MENU SELECT

Parameter Selection Screen (

Ch 3

Buffer

) MENU SELECT

Contrast

(adjustment screen)

MENU SELECT

….. To return to the Home screen

3.2 MENUS

There are three sets of menus on the Model C-22. The Channel 1 menus (PV1) the Ammonium Ion channel (NH the pH channel. Pressing the MENU SELECT UP key will first access the Potassium channel and then the pH channel, pressing the MENU SELECT DOWN key will access the Ammonium channel. See the guide below for the general menu structure.

3.2.1 Ammonium Ion Channel 1 Menu Structure

3.2.2 Potassium Ion Channel 2 Menu Structure

-N), the Channel 2 menus (PV2) the Potassium Ion channel and the Channel 3 menus (PV3)

▼

▲

▼

3.2.3 pH Channel 3 Menu Structure

▲

▼

3.2.4 Graphical Display Screen

This Graphical Display is only available in the Channel 1 menu. It is located one screen down from the Home Screen. It displays a user assigned output value, for example, 4-20 mA1 vs. time. The Graphical

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Screen

Displayed

Button Pressed

Ch1 Buffer

CALIBRATE

(enter

the calibration menu by pressing

both

◄►

simultaneously

)

1 NH4-N

4.0

0 ppm

Cal

.0 mV

CALIBRATE

(enter line

, zero pt. Cal 1)

Sensor should be in the Cal 1 solution.

NH4-N

4.00

ppm

Cal

393.5 mV

To set Calibration Sol. Value use the CALIBRATE

or ►

move cursor. Use the

to adjust the integer value.

NH4-N

5.00 ppm

Cal

393.5 mV

MENU SELECT

(accept Calibration)

1 NH4-N

5.00 ppm

Cal

393.5 mV

MENU SELECT

(move to Cal line)

NH4-N

5.00

ppm

393.5 mV

MENU SELECT

(move to Cal 2, Slope)

Remove sensor, rinse and place in Cal 2 solution

2 NH4-N

00.0 ppm

Cal

29.6 mV/dec

CALIBR

ATE ►

(enter screen)

NH4-N

00.0

ppm

Cal

29.6 mV/dec

To set Calibration Sol. Value use the CALIBRATE

or ►

move cursor. Use the

to adjust the integer value.

NH4-N

0.0 ppm

Cal

29.6 mV/dec

MENU SELECT

(accept Calibration)

2 NH4-N

0.0 ppm

Cal

29.2 mV/dec

CALIBRATE

(return to Home Screen)

Display variables; which Output to display and which Time interval is used are configured in the Channel 1 Set-Up Menu. See Section 3.2.6, below, for more information on the Set-Up Menu.

3.2.5 Buffer Menu

The Buffer Menus are Calibration Menus. To access the Buffer Menu the cursor must be flashing in front of the “Ch X Buffer” line. Simultaneously press both of the Horizontal CALIBRATE keys to enter the Calibration screens. The calibration is structured for a two point calibration.

The first calibration “1 NH4-N” is the “zero point” calibration. This sets a base millivolt value to a specific ion concentration. The concentration is adjustable to suit the measurement range, see procedure below. When adjusting a value first move the cursor to the largest integer to be adjusted, perform the adjustment and then move to the next lower value. When a calibration is performed the Cal line will display the millivolt value associated with calibration standard solution. The Cal value can be reset to the Factory default setting by “entering” the Cal line.

The second calibration screen is the “slope, mV/decade” calibration. This calibration should use a standard solution that is at least 10X the concentration of the solution used in the first calibration. Scroll down to the “2 NH4-N” line and enter the value of the standard solution and the Cal line will display the new slope, mV/decade. Follow the same procedure for calibration of Channels 2 & 3.

◄

►

◄

▲or▼

▼

◄

▲or▼

▼

3.2.6 Set-Up Menu

The Setup menu allows the various parameters to be configured for the user’s requirements. Each Channel has a Set-Up Menu that includes the parameters associated with that specific Channel. The

HYDRA NH

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Screen Displayed

Button Pressed

Ch1 Setup

◄

CALIBRATE

►

(enter screen)

lot 4-

20 1

MENU SELECT

Plot

4-20 1

MENU SELECT

4mA1

.0 ppt

OUTPUT SET

-UP

CALIBRATE

►

(enter 4mA line)

4mA1

.0 ppt

To adjust the value

use the CALIBRATE

or ►

to move

4mA1 00.1 ppb

MENU SELECT

(accept the Value)

4mA1

00.1

ppb

MENU SELECT

4mA1

00.1

ppb

CALIBRATE

►

(enter 20mA line)

4mA1

00.1

ppb

To adjust the value

use the CALIBRATE

or ►

to move

4mA1

00.1

ppb

MENU SELECT

(accept the Value)

4mA1

00.1

ppb

MENU SELECT

2 On

> .0 ppt

RELAY SET

-UP

CALIBRATE

►

(enter Relay Set Point)

2 On > .

ppt

To adjust the value

use the CALIBRATE

or ►

to move

On >

10.00

ppm

MENU SELECT

(save

the Value)

2 On >

00.0

ppm

MENU SELECT

On >

10.00

ppm

CALIBRATE

►

(enter Relay Hysteresis Point)

2 On

> 10.00

ppm

To adjust the value

use the CALIBRATE

or ►

to move

2 On

< 10.00

ppm

MENU SELECT

(save

the Value)

** Whether the relay is a

< 10.00

ppm

(Low Alarm

MENU SELECT

(If the NH

N drops below 10

0 ppm the

Graphical Display, 4-20 mA Outputs, Alarm Relays and Timers are all configured in the Setup Menu. Ion selective electrodes have unique Iso-Potential points, the mV value for the concentration where changes in temperature have no effect. This value is supplied with each specific ion electrode and must be entered in the “isopot” entry line below. This provides the analyzer with the base point for temperature compensation.

▼

Sample .1 m

(the “4-20 1” indicates the displayed value, variable)

▼

Sample .1 m

(the Sample time is 0.1 minutes, variable)

◄

20mA1 999.9 ppt

◄

20mA1 999.9 ppt

cursor. Use the ▲or▼ to adjust the integer value.

▼

20mA1 999.9 ppt

▼

20mA1 999.9 ppt

◄

20mA1 999.9 ppt

◄

20mA1 999.9 ppt

cursor. Use the ▲or▼ to adjust the integer value.

▼

20mA1 100 ppm

▼

20mA1 100 ppm

(4-20 is set to 00.1 ppb to 1000 ppm)

◄

2 Off < .0 ppt

◄

2 Off < .0 ppt

cursor. Use the ▲or▼ to adjust the integer value.

▼

2 Off < .0 ppt

▼

2 Off < .0 ppt

◄

2 Off < .0 ppt

◄

2 Off < .0 ppt

cursor. Use the ▲or▼ to adjust the integer value.

▼

2 Off > 11.00 ppm

2 Off > 11.00 ppm example) 2 On > 10.00 ppm (High Alarm 2 Off < 9.500 ppm example)

High or Low Alarm is determined by the Off value **

▼

contact closes until it is higher than 11 ppm. If the Off value is set to 9.5 ppm then the contact will switch to a High Alarm, closing at 10.0 ppm and re-opening below 9.5 ppm.)

Page 12 HYDRA NH

-N

imer 1: periodic

CALIBRATE

►

er 0d00 :00 :00

Cleaning Timer

CALIBRATE

►

Per 0d0

0 :15 :00

To adjust the value

use the CALIBRATE

or ►

to move

Per 0d0

0 :15

:00

CALIBRATE

►

(enter the

Off line, the duration of the

Timer 2: oneshot

↑

CALIBRATE

►

ow 0 00 :00 :00

Manual Mode Timer

MENU SELECT

, MENU SELECT

CALIBRATE

►

.120

MENU SELECT

NH4

electrode selectivity ratio for K

.120

MENU SELECT

K+ compensation should be

Off for

C .333 %/

°C

MENU SELECT

C .333 %/

°C

CALIBRATE

►

(Enter Iso

Potential Entry line)

C .333 %/

°C

To adjust the value

use the CALIBRATE

or ►

to move

C .333 %/

°C

MENU SELECT

(accept the Value)

C .333 %/

°C

MENU SELECT

Noise Filter 5

CALIBRATE

(return to Home Screen)

◄

←Clock

◄

Now 0 00 :00 :00 (Per sets the time On 0 00 :00 :00 between cleaning Off 0 00 :00 :00 cycles)

(Set the Period to 15 minutes then every ¼ hour the Now Clock will reset to 0:00:00 and trigger the On Timer which is set at 0:00:00, starting the cleaning cycle.)

◄

Now 0 00 :00 :00 On 0 00 :00 :00 Off 0 00 :00 :00

cursor. Use the ▲or▼ to adjust the integer value, then MENU SELECT ▼ (save the Value) MENU SELECT ▼, MENU SELECT ▼, MENU SELECT ▼

◄

Now 0 00 :00 :00 (Set the Off time On 0 00 :00 :00 at 30 seconds) Off 0 00 :00 :30

cleaning cycle) To adjust the value use the CALIBRATE ◄ or ► to move cursor. Use the ▲or▼ to adjust the integer value, then MENU SELECT ▼ (save the Value)

◄

←timer 1←clock

On 0 00 :00 :00 (Hold Function) Off 0 00 :01 :30 (Set at 1 min 30 sec)

4-20 mA hold time after cleaning cycle, (CT + 1 minute)

▼

▼, ◄

To adjust the value use the CALIBRATE ◄ or ► to move cursor. Use the ▲or▼ to adjust the integer value.

▼

K+ comp Off

NH4 reading – 0.120 (K+ reading) = NH4 concentration

▼

K+ comp Off

Calibration and On for Measurement

▼

Isopot 20.0 mV

Temperature Compensation (no adjustments needed) Equilib 9.24 pH Dissoc 1.000 Off

◄

Isopot .0 mV ** Mandatory ** Equilib 9.24 pH ** Input **

**Iso-Potential value supplied with each electrode** Dissoc 1.000 Off

◄

Isopot 20.0 mV

cursor. Use the ▲or▼ to adjust the integer value. Equilib 9.24 pH Dissoc 1.000 Off

▼

Isopot 187.0 mV Equilib 9.24 pH Dissoc 1.000 Off

MENU SELECT ▼ Equilibrium value, No Input Needed

(Equilib= pH value equal to the pKa, the acid dissociation

constant, where [NH4 = NH3 + H+])

▼

Isopot 187.0mV Equilib 9.24 pH Dissoc 1.000 On

Dissoc = the pH correction factor for the [NH4 ↔ NH3 + H+]

dissociation , (the Measured NH4)/Dissoc = Total NH4-N

(should be on at all times)

▼

HYDRA NH

-N Page 13

Screen Displayed

Button Pressed

h1 Status

◄

CALIBRATE

►

(enter screen)

Fri 09:11:28

MENU SELECT

Input 364.2 mV

CALIBRATE

(return to Home Screen)

Screen Displayed

Button Pressed

nfigure/Trim

◄

CALIBRATE

►

(enter screen)

Passwords

MENU SELECT

(allows menus to be

password protected)

Default Display

MENU SELECT

(defines Home Screen)

4-20 assign

MENU SELECT

(Assigns parameter/function to mA output)

Manual Mode

MENU SELECT

(Allows manual control of mA outputs)

Relay assign/Test

MENU SELECT

(Assigns triggering

parameter to a relay)

PID Assign

MENU SELECT

(Assigns PID to a PV)

PWM Assign

MENU SELECT

(Assigns Pulse Width Modulation to a PV)

Clock and timers

MENU SELECT

(Sets Clock function, assigns Timers)

Logic Gates

MENU SELECT

(assigns AND/OR gates)

Ion Species

MENU SELECT

(Sets Ion Measured)

General

MENU SELECT

( Not Used)

°C/°F & Temp Cal

MENU SELECT

( allows temperature trim/cal, choose °C/°F)

4-20 Trim/Test

MENU SELECT

(allows mA trim)

Millivolt Trim

CALIBRATE

(return to Home Screen)

3.2.7 Status Menu

The Status menu displays the actual uncompensated millivolt value from the sensor, very handy information for troubleshooting. The day and time, hours: minutes: seconds, are also displayed.

▼

3.2.8 Configuration and Trim Menu

The Configure/Trim menu provides access to the menus used to assign parameters, define functions and trim input and output signals. This group of menus should rarely be needed as the instrument was configured at the factory before testing and shipment. The basic structure is as follows. See the “System 22 Configuration Manual” for details about these menus, available at www.ecdi.com.

▼

3.3 OUTPUTS

The Standard C-22 HYDRA Analyzer has two 4-20 mA outputs. The default configuration has “mA 1” configured for NH4-N, 4-20 mA = 00.1 ppb to 50 ppm and “mA 2” is configured for pH, 4-20 mA = 2-12 pH. To reconfigure the outputs see Section 3.2.6, Set-Up Menu, above.

Page 14 HYDRA NH

-N

The Outputs, mA 1 and mA 2, are held at the “Last Value” by Timer 2 during the Air Blast Cleaning Cycle. The Outputs return to live readings one minute after the cleaning cycle ends. Timer 2 is a “one-shot” timer triggered by Timer 1. When Timer 1 triggers, it starts Timer 2 which is set to run for a period of time equal to the cleaning time plus one minute.

3.3.1 Manual Mode (4-20 mA Hold Function)

The % Output is displayed on the Home Screen for the NH4-N output, mA 1, and one screen above the Home Screen for the pH % Output, mA 2.

The outputs can be set for manual control by simultaneously pressing both horizontal CALIBRATE keys when the cursor is in front of the % Output line. An “M” will be displayed in front of the % Output value. The Output will remain frozen at the last value until the Manual Mode is turned off. The Manual Mode hold function is commonly used to freeze the outputs during maintenance and calibration cycles. While in Manual Mode the Output can be adjusted between 0 and 99.9% using the CALIBRATE keys, very useful for troubleshooting loop communication problems.

To exit Manual Mode press the left CALIBRATE arrow, ◄, three times and the “M” will disappear, the Output will return to a live reading.

3.4 CONTACTS-ALARM RELAYS

3.4.1 Standard Configuration Relay 1 is configured to control the Air Blast Spray Cleaner. It is triggered by Timer 1. Timer 1 is

configured as a periodic timer. The default setting for the period is 15 minutes with the duration set at 30 seconds. The period and duration of the cleaning cycle is user configurable and dependent on the application. For water going to the clarifier an adequate cleaning cycle may be, every two hours for 15 seconds, where incoming water to an aeration basin may require a 30 second cleaning cycle every 15 minutes.

The Now clock is an arbitrary timer. The Period determines the amount of time that must pass before the Now clock resets to 00 hours, 00 minutes and 00 seconds, 00: 00: 00. The On time is the start time and it is set at 00: 00: 00, so every time the clock resets Relay 1 is triggered. The Off time sets the duration of Timer 1 and is set at 00: 00: 30, thirty seconds. (See Section 3.2.6 above)

To Change how often the Spray Cleaner actuates, change the Per line to the desired period. The display is set for days, hours: minutes: seconds, 0d00: 00: 00.

To Change the duration of the Cleaning cycle change the Off line. If the duration is changed from the default value of 30 seconds then the Manual Mode Timer should be adjusted to allow the sensor to stabilize after the cleaning cycle. Adjust Timer 2; Off line; to the new Clean Time (CT) + 1 minute.

Relay 2 is configured as a high alarm triggering at 10.0 ppm NH

-N. The value can be changed in the Set-

HYDRA NH

-N Page 15

value which forces an automatic sign change. The Off value is the hysteresis point that the PV has to correct to before the relay disengages.

3.4.2 One AC10 with Two HYDRAs

When two HYDRA Analyzers are connected to one AC10 Air Blast Spray Cleaning System then one C22 Analyzer becomes the MASTER and the other C22 Analyzer is a SLAVE.

3.4.2.1 Master Configuration

Relay 1 is configured as a high alarm triggering at 10.0 ppm NH

-N. The value can be changed in the Set-

Up Menu as shown in Section 3.2.6. Changing the > sign to a < sign in the On line changes the set point from a high to a low alarm. This can also be accomplished by setting the Off value higher than the On value which forces an automatic sign change. The Off value is the hysteresis point that the PV has to correct to before the relay disengages.

Relay 2 is configured to trigger the Digital Input (Aux In) of the SLAVE analyzer. This initiates the Manual Mode function of the SLAVE analyzer, placing the mA outputs in a Last Value Hold (Bumpless).

Relay 3 is configured to control the Air Blast Spray Cleaner. It is triggered by Timer 1. Timer 1 is configured as a periodic timer. The default setting (Set Up Menu) for the period is 15 minutes with the duration set at 30 seconds. This triggers a cleaning cycle every 15 minutes alternating between the MASTER and the SLAVE units, so each HYDRA sensor is cleaned every 30 minutes. (see Relay 4 below)The period and duration of the cleaning cycle is user configurable and dependent on the application. For water going to the clarifier an adequate cleaning cycle may be, every two hours for 15 seconds, where incoming water to an aeration basin may require a 30 second cleaning cycle every 15 minutes.

To Change how often the Spray Cleaner actuates, change the Per line to ½ the desired period. The display is set for days, hours: minutes: seconds, 0d00: 00: 00.

Relay 4 is configured to control the diverter valve which alternates the Air Blast between the two sensors. It is triggered by Timer 2. Timer 2 is configured as a periodic timer. The default setting (Set Up Menu) for the period is 30 minutes with the duration set at 30 seconds. The Period of Timer 2 must be twice the Period of Timer 1 and have the same duration.

Page 16 HYDRA NH

-N

% NH4+

% NH3

3.5 ION SELECTIVE FEATURES

The Hydra C22 analyzer has several features unique to Ion Selective Electrode measurements, Isopotential, Interfering Ion Correction and pH Correction. The measurement range of the sensors is from some ppb level to some ppm level, XXX ppb – XXX ppm, not the traditional 0 – XXX common to most measurements, there is no zero value. This is most evident when configuring the 4-20 mA outputs.

3.5.1 The Isopotential point

Isopot in the menu is the mV value of the specific sensor where changes in the temperature of the solution do not change the output of the sensor. This is the base point for temperature compensation correction. Most pH electrodes have an isopotential near pH 7, but each type of Ion Selective electrode has a unique isopotential value. Each NH4+ and K+ electrode is supplied with an Isopot that must be entered in the respective Set-Up Menu.

3.5.2 Potassium Ion Interference Correction

Potassium ions and Ammonium ions have a similar ionic size and the same electrical charge. If Potassium ions are present in the measured solution then they will cause a positive Interference on the Ammonium Ion Measurement. The corrections for the Interfering Ions are in the Ks and K+ comp screen in the Set-Up menu. The Ks, potassium ion selectivity, is the correction factor, ppm NH

/ppm K+;

Example: (50 ppm K+) x (0.10 ppm NH

With the Ks set at 0.10 (10 K+/ NH

) then 50 ppm potassium ion would cause the ammonium

/ ppm K+) = 5 ppm NH

interference

measurement to read 5 ppm high. When the K+ comp line is On the C22 Analyzer uses the potassium ion concentration from the Potassium Ion Electrode and the Ks factor to calculate the amount of interference on the Ammonium Ion Electrode and subtracts it from the measured ammonium value before displaying the NH4-N value.

3.5.3 pH Correction

The Ammonium Ion Electrode only measures the ammonium ion (NH

) not ammonia (NH3). Ammonium

ion and ammonia coexist in a pH dependent ratio in solution. At pH 9.24 the ratio is 1:1, at pH 7 nearly all of the ammonia is in the ammonium state and at pH 11 it is nearly all ammonia which is invisible to the sensor. The more acidic values favor the NH

and the more basic values favor

ammonia gas, NH3. The pH Electrode measures the pH and the HYDRA C22 Analyzer calculates the total NH

-N

concentration based on the pH vs. concentration profile. The Dissociation should be On at all times.

% concentration vs pH

100

NH3/NH

HYDRA NH

6 8 10 12

-N Page 17

Ch 1 Setup Menu

Settings

Plot 4

20 1

4mA1

0.1 ppb

2 On > 10.00 ppm

Timer 1 : periodic

Per 0d0

0 :15

:00

Timer 2 :

oneshot

↑ Now 0 00 :00 :00

Ks 0.10

TC .333 %/°C

Noise filter 5

Ch 2

Setup Menu

Settings

TC .333 %/°C

Noise filter 5

4.0 START UP

The HYDRA Analyzer and Sensor was assembled and tested at the factory before shipment. The sensor was then disconnected from the analyzer, cleaned and packaged for shipment. The HYDRA C22 analyzer is configured as shown below and should be ready to use aside from any changes the user may wish to make to the Outputs, Cleaning Timers and Alarm Set points.

Complete all of the steps in Section 2 INSTALLATION (above) before proceeding further. These steps include:

1. Install the Analyzer in a suitable environment.

2. Determine an installation method and representative sample point for the sensor.

3. Connect the Air Blast Spray Cleaner tube to a solenoid controlled air supply, 1-4 bar (15-60 psig).

4. Wire the Power, Outputs, Contact Relays and the HYDRA Sensor to the HYDRA C22 Analyzer.

Familiarize yourself with the MENU Structure of the HYDRA C22 Analyzer, Section 3 (above).

4.1 SET-UP AND CONFIGURATION

The HYDRA C22 analyzer is configured as shown below. Changes to the default configuration can be easily made as described in Section 3 above.

4.1.1 Set Up Menus, Standard

Sample .1 m

20mA1 50.00 ppm

2 Off < 9.500 ppm

K+ comp On

Isopot XXX.X mV Equilib 9.24 pH Dissoc 1.000 On

Now 0 00 :00 :00 On 0 00 :00 :00 Off 0 00 :00 :30

On 0 00 :00 :00 Off 0 00 :01 :30

Page 18 HYDRA NH

Isopot XXX.X mV

-N

Ch 3 Setup Menu

Settings

4mA 2.00 pH

Noise filter 5

Ch 1

Setup Menu

Settings

Plot 4

20 1

4mA1 0.1 ppb

1 On > 10.00 ppm

Timer 1 : periodic

Per 0d00 :15 :00

Timer 2 : periodic

Per 0d00 :30 :00

Timer 3 : oneshot

↑ Now 0 00 :00 :00

Ks 0.10

TC .333 %/°C

Noise filter 5

Ch 2 Setup Menu

Settings

TC .333 %/°C

Noise filter 5

Ch 3 Setup Menu

Settings

4mA 2.00 pH

Noise filter 5

Ch 1 Setup Menu

Settings

Plot 4

20 1

4mA1 0.1 ppb

20mA 12.00 pH

4.1.2 Set Up Menu, MASTER/SLAVE Master

Sample .1 m

20mA1 50.00 ppm

1 Off < 9.500 ppm

K+ comp On

Isopot XXX.X mV Equilib 9.24 pH Dissoc 1.000 On

Now 0 00 :00 :00 On 0 00 :00 :00 Off 0 00 :00 :30

On 0 00 :00 :00 Off 0 00 :01 :30

Slave

HYDRA NH

Isopot XXX.X mV

20mA 12.00 pH

Sample .1 m

20mA1 50.00 ppm

-N Page 19

1 On > 10.00

ppm

Timer 1 : oneshot

↑ Now 0 00 :00 :00

Ks 0.10

TC .333 %/°C

Noise filter 5

Ch 2 Setup Menu

Settings

TC .333 %/°C

Noise filter 5

Ch 3 Setup Menu

Settings

4mA 2.00 pH

1 On > 7.50 pH

Noise filter 5

Settings

Passwords

No Pass Words (not configured)

Default display

0 (not configured)

4-20

assign

20 1 : Ch1 PV

Manual Mode

Ch1 man mode on: 4

20 1

Ch2 man mode on:

4-20 2

lay assign/test

Relay

1 timer 1

PID Assign

PID A unused

Clock and timers

Clock: Software

Ch 1 Setup Menu, cont’d

1 Off < 9.500 ppm

On 0 00 :00 :00 Off 0 00 :01 :30

K+ comp On

Isopot XXX.X mV Equilib 9.24 pH Dissoc 1.000 On

Isopot XXX.X mV

20mA 12.00 pH

1 Off < 7.40 pH

4.1.3 Configure and Trim Menu, Standard

The Configure and Trim is configured as shown be and does not require any adjustments.

4-20 2 : Ch3 PV

Initial ch1 manual setting: Bumpless Ch1 auto entry: timer 2

Initial ch2 manual setting: Bumpless Ch2 auto entry: timer 2

Relay 2 Ch1 PV (Relays 3-8 set to missing)

PID B unused

Hide Clock N Hide Rate Y Hide Flash N Man trig OK Y

Page 20 HYDRA NH

-N

Timer 1: periodic

Timer2:

oneshot

↑

Logic gates

All unused

Ion Species

Ch1 ion NH4

-N

General

No Menu

°C/°F & temp cal

1 Trim °C .0

4-20 Trim/Test

(not configured)

Millivolt trim

(not configured)

Settings

Passwords

No Pass Words (not configured)

Default display

0 (not configured)

4-20 assign

20 1 : Ch1 PV

Manual Mode

Ch1 man mode on:

4-20 1

Ch2 man mode on: 4

20 2

Relay assign/test

Relay 1 Ch1 PV

PID

Assign

PID A

& B

unused

Clock and timers

Clock: Software

Timer 1: periodic

Timer 2: periodic

Timer

3: oneshot

↑

Logic gates

AND Gate A

Retriggerable N Resettable N Trig 2 timer 1

Ch2 ion K+

Unit 200.0 °C

4.1.4 Configure and Trim Menu, MASTER/SLAVE MASTER

4-20 2 : Ch3 PV

Initial ch1 manual setting: Bumpless Ch1 auto entry: timer 3

Initial ch2 manual setting: Bumpless Ch2 auto entry: timer 3

Relay 2 timer 2 Relay 3 timer 1 Relay 4 timer 2

Hide Clock N Hide Rate Y Hide Flash N Man trig OK Y

Retriggerable N Resettable N Trig 3 AND A

HYDRA NH

-N Page 21

In Timer 1 In Timer/2

OR Gates A, B, C Not Used

Ion Species

Ch1 ion NH4

-N

General

No Menu

°C/°F & temp cal

1 Trim °C .0

4-20 Trim/Test

(not

configured)

Millivolt trim

(not configured)

SLAVE

Settings

Passwords

No Pass Words (not configured)

Default display

0 (not configured)

4-20 assign

20 1 : Ch1 PV

Manual Mode

Ch1 man mode on: 4

20 1

Ch2

man mode on: 4

20 2

Relay assign/test

Relay 1

Ch 1 PV

PID Assign

PID A unused

Clock and timers

Clock: Software

Timer

1: oneshot

↑

(Timers 3

8 unused)

Logic gates

All unused

Ion

Species

Ch1 ion NH4

-N

General

No Menu

°C/°F & temp cal

1 Trim °C .0

4-20 Trim/Test

(not configured)

Millivolt trim

(not configured)

AND Gate B, C Not Used

Ch2 ion K+

Unit 200.0 °C

4-20 2 : Ch3 PV

Initial ch1 manual setting: Bumpless Ch1 auto entry: timer 1

Initial ch2 manual setting: Bumpless Ch2 auto entry: timer 1

Relay 2 Ch 2 PV (Relays 3-8 set to missing)

PID B unused

Hide Clock N Hide Rate Y Hide Flash N Man trig OK Y

Retriggerable N Resettable N Trig 1 Ext/1

Ch2 ion K+

Page 22 HYDRA NH

Unit 200.0 °C

-N

4.2 CALIBRATION

The HYDRA Ammonium Analyzer was calibrated at the factory using the Two Point Calibration described below. The sensor was assembled and placed beaker of equilibration solution for 8-12 hours before starting the calibration. The Potassium Ion and Ammonium Ion electrodes sensing membranes require several hours to properly hydrate/ equilibrate to the measured solution. The calibration sets the zero potential and slope for each of the sensors into the analyzers memory.

Since the factory calibration characterizes the complete measurement system the initial user calibration should only require a standardization of the Ammonium Ion Electrode once the HYDRA has equilibrated to the process solution.

The Factory Calibration and all subsequent calibrations should be performed in the following sequence:

1. Temperature Calibration

2. pH Electrode calibration in pH 4.01 buffer and pH 7.00 buffer (2 point)

3. Potassium Electrode calibration in 1 ppm and 100 ppm solutions (2 point)

4. Ammonium Electrode calibration in 1 ppm and 100 ppm solutions (2 point)

Calibration checks should be performed weekly by comparison to a grab sample or immersing the HYDRA sensor into a standard solution with known pH, K+ and NH4-N values. Performing a Single Point Calibration will eliminate any offset found in the calibration check. Continuous drifting of the potassium or ammonium ion reading may indicate the electrode needs to be replaced. (See Section 6 Trouble Shooting below)

Two Point Calibration is required whenever an electrode is replaced, pH, Potassium or Ammonium. Two Point Calibrations are also recommended every two months to verify the response of the electrodes is greater than 50 mV/decade.

4.2.1 Recommended Materials pH Calibration Solutions

1. pH 4.01, 500 ml (Part # 2010100)

2. pH 7.00, 500 ml (Part# 2010101)

pIon Calibration Solutions

1. 1 ppm K+, 500 ml (Part# 2010443)

2. 100 ppm K+, 500 ml (part# 2010444)

3. 1 ppm NH

4. 100 ppm NH

-N, 500 ml (Part# 2010445)

-N, 500 ml (part# 2010446)

Accessories

1. 1 liter plastic beakers

2. Distilled Water for rinsing

3. Calibrated thermometer with 0.1 °C graduations

4. Stir plate with magnetic stir bars.

HYDRA NH

-N Page 23

Channel

Screen

ECD HYDRA Ammonium User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual