HydroAir P-38 Series User manual

1st Edition
Operations Manual
P-38 Series
pH/ORP Analyzer

Hydro-Air P-38
Table of Content
pH / ORP Analyzer I
Table of Content
Table of Content.....................................................................................................I
1.0 Specifications .............................................................................................1
2.0 Introduction.................................................................................................2
2.1. General Information............................................................................2
2.2. Safety Information ..............................................................................2
2.3. Safety Precautions .............................................................................3
2.3.1. Handling by authorized personnel ......................................3
2.3.2. Environmental condition consideration...............................3
2.3.3. Component isolation ...........................................................3
2.3.4. Elimination of unsafe acts and conditions...........................3
3.0 Product Overview .......................................................................................4
3.1. Product Content..................................................................................4
3.2. Dimensions.........................................................................................4
4.0 Installation...................................................................................................5
4.1. Electrical Construction........................................................................5
4.2. Sensor Connection.............................................................................7
4.2.1. Conventional Combination Sensor Without Grounding
Electrode (2-Wire Sensor) ..................................................8
4.2.2. Conventional Combination Sensor With Grounding
Electrode (3-Wire Sensor) ..................................................9
4.2.3. Differential Sensor ............................................................10
5.0 User Interface............................................................................................11
5.1. Front Screen.....................................................................................11
5.2. Main Menu........................................................................................13
6.0 Advanced Operation.................................................................................14
6.1. 4-20mA (Current Output Settings)....................................................14
6.2. Relay A Settings...............................................................................14
6.3. Relay B Settings...............................................................................15

Table of Content
Hydro-Air P-38
II pH / ORP Analyzer
6.4. Measurement Settings .....................................................................15
6.5. Temperature Settings.......................................................................16
6.6. RS-485 Settings ...............................................................................16
6.7. Simulator Settings ............................................................................17
6.8. Language Settings............................................................................17
6.9. Default Settings................................................................................18
6.10. Version .............................................................................................18
7.0 Calibration.................................................................................................19
7.1. Calibration Menu ..............................................................................19
7.2. pH Calibration...................................................................................19
7.3. ORP Calibration................................................................................22
7.4. Default ..............................................................................................23
8.0 RS-485 Command.....................................................................................24
8.1. Connections......................................................................................24
8.2. Settings.............................................................................................24
8.3. Start Address....................................................................................24

Hydro-Air P-38
Specifications
pH / ORP Analyzer 1
1.0 Specifications
Specifications are subjected to change without notice.
SPECIFICATIONS
DETAILS
pH
ORP
Measuring Range
-2.00 to +16.00pH
-2000 to +2000mV
Resolution
0.01pH
1mV
Accuracy
±0.01pH
±1mV
Temperature Probe
Pt 1000 / NTC 10K
Temperature Range
-10.0℃to +130.0℃
Temperature Resolution
0.1℃
Temperature Accuracy
±0.2℃
Ambient Temperature
0℃to +70℃
Storage Temperature
-20.0℃to +70.0℃
Input Impedance
>1012Ω
Analogue Output
1 x 4-20mA electrically isolated, max load 500Ω
Control Outputs
2 x Relay Outputs
Max. Relay Contacts
Capacity
5A/250 VAC
5A/30 VDC
Fieldbus Connection
RS-485 Modbus
Baud Rate
9600
Protection Class
IP65
Display
128 x 64 LCD Module
Language Selection
English
Others upon request
Electrical Connection
90 to 260 VAC or
24 VDC
Power consumption <5W
Dimensions (H x W x D)
108mm x 108mm x 140mm
Panel Cutout
92mm x 92mm
Weight
0.55 kg

Introduction
Hydro-Air P-38
2 pH / ORP Analyzer
2.0 Introduction
2.1. General Information
Notice
Indicates essential information regarding operation, calibration or anything which is
considered as good practice or handling of the products.
The manufacturer will not be liable and responsible for any direct, indirect,
incidental or consequential damages due to any defect or omission in the
operations manual. The manufacturer reserves the right to alter the content in the
operations manual as well as the products without any notification. Please contact
the manufacturer to request the latest and revised editions of the operations
manual.
Unpacking, setting, installing and operating of the product require comprehensive
knowledge and understanding of the entire operations manual. Please take note to
all danger, warning and notice signs and details. Negligence of the danger, warning
and notice signs could increase the risk of serious injury to the product’s operator
or even inflicting damage to the products. Do not install, calibrate or operate this
product in any manner other than that specified in the operations manual.
2.2. Safety Information
DANGER!
[Signage]
Neglecting the signs may result in death or at least serious injury
to the operator.
WARNING!
[Signage]
Neglecting the signs may result in mild or at least minor injury to
the operator.

Hydro-Air P-38
Introduction
pH / ORP Analyzer 3
2.3. Safety Precautions
It’s vitally important to take safety precautions during the installation, operation and
calibration of sensors and controllers. Safety must not be compromised; some
ground rules need to be followed first. The basic guidelines regarding the safe
handling of electrical components are documented below will help users while
working with electricity.
2.3.1. Handling by authorized personnel
The instrument must be operated by trained personnel and technical
personnel.
2.3.2. Environmental condition consideration
In order to prevent irreparable component damage, the instrument must be
installed in room temperature with low humidity, no corrosivity and no direct
sunlight exposure.
2.3.3. Component isolation
The signal cables in the instrument should be separated from the power
lines and machines that produces high noise interference which affects the
performance of the controller significantly.
2.3.4. Elimination of unsafe acts and conditions
During installation and operation of the instrument, never use frayed cords,
damaged insulation or broken plugs. Always use insulated tools while
working. Do not connect AC power to a 24VDC powered model and vice
versa.
Limitations
The warranty doesnot cover defectsor malfunction causedby misuse, abuse or improper
maintenance, failure to follow operating instructions, or use with equipment which it is not
intended to be used. It doesn’t cover cosmetic or incidental damages. Also, the warranty
will not apply to damage caused by unauthorized alteration, modification or repair of the
product.

Product Overview
Hydro-Air P-38
4 pH / ORP Analyzer
3.0 Product Overview
3.1. Product Content
The P-38 series packaging contains 1 x P-38 controller, 1 x printed manual and
2 x holders.
3.2. Dimensions
The instrument can be installed into control panel. Allocate a 92x92mm square
cutout, insert the controller then screw the fixed holder.
Figure 1 Controller dimensions from panel, front, back and side view.
Panel Cutout
Front View
Back View
Side View
128mm
95mm
82mm
50mm
38mm
5mm
82mm
5mm
13mm
92mm
HOLDER
92mm
102mm
92mm
102mm

Hydro-Air P-38
Installation
pH / ORP Analyzer 5
4.0 Installation
This part describes how to install the controller and how to connect the unit to a
power source and auxiliary equipment.
Wiring Installation
The specified performance of the controller is entirely dependent on correct
installation. For this reason, the installer should thoroughly read the following
instructions before attempting to make any electrical connections to the unit.
DANGER!
Electrocution Hazard; Do not connect AC power to a 24VDC
powered model and vice versa. Always avoid water when
working with electricity. Never touch or try repairing any
electrical parts or circuits with wet hands. It increases the
conductivity of the electric current.
WARNING!
Always remove the main power from the system before
attempting any alterations to the wiring. Ensure that both power
input lines are isolated. Make sure that the power cannot be
switched on by accident whilst the unit is being connected. Local
wiring and safety regulations should be strictly adhered to when
installing this unit.
4.1. Electrical Construction
The controller operates with a main switch. Hence, the controller operates
immediately once connected to the power supply. The result can be observed via
the display panel. The controller features two actuators (relays) which provide
control functions. Moreover, the relays are designed to activate metering pumps
and solenoid valves. The activation variables are recalculated every second.
The controller comes in two different variants; P38 which runs with 90~260VAC
power supply, and P38-DC which runs with 24VDC power supply.

Installation
Hydro-Air P-38
6 pH / ORP Analyzer
Figure 2 Connection label of P38 (90~260VAC power supply)
Figure 3 Connection label of P38-DC (24VDC power supply)
24V+
24V-

Hydro-Air P-38
Installation
pH / ORP Analyzer 7
Conductive layer not removed
pH
Ref.
Conductive layer removed
pH
Ref.
4.2. Sensor Connection
Extension of sensor cable
If the user chooses to extend the sensor cable, please ensure the extension cable is
coaxial type and is in good condition.
For sensors without a built-in pre-amplifier (e.g. Conventional Combination Sensor), it is
highly recommended to install an external pre-amplifier into any cable connection
exceeding 25m to ensure excellent reading accuracy and consistency of the sensor.
Removal of Conductive Layer
The user must ensure the pH cable is separated from the Reference cable. Moreover,
the conductive layer covering the pH cable must be removed in order to isolate the pH
circuit connection from the Reference. Otherwise, the sensor will display incorrect
readings.

Installation
Hydro-Air P-38
8 pH / ORP Analyzer
4.2.1. Conventional Combination Sensor Without Grounding
Electrode (2-Wire Sensor)
The 2-Wire Sensor features an Active Electrode (pH) and a Reference Electrode
(Ref.). The Temperature Electrode (Temp. or T/P) is an optional feature of the
sensor for temperature compensation. Since the 2-Wire Sensor does not feature a
Grounding Electrode, the short pin is required in this setup.
Figure 4 Connection figure for 2-Wire Sensor
Conductive layer
T/P or Temp. (Pt1000 / NTC10K)
SHORT
12
11
10
6
5
pH (Transparent)
Coaxial
cable
Sensor Body
Ref. (Black)

Hydro-Air P-38
Installation
pH / ORP Analyzer 9
4.2.2. Conventional Combination Sensor With Grounding
Electrode (3-Wire Sensor)
The 3-Wire Sensor features an Active Electrode (pH), a Reference Electrode (Ref.)
and a Grounding Electrode (GND) to eliminate noise / disturbance in the process
medium. The Temperature Electrode (Temp. or T/P) is an optional feature of the
sensor for temperature compensation. Since the 3-Wire Sensor features a
Grounding Electrode, the short pin is not required in this setup.
Figure 5 Connection figure for 3-Wire Sensor
T/P or Temp. (Pt1000 / NTC10K)
12
11
6
5
pH (Transparent)
Conductive layer
Coaxial
cable
Sensor Body
Ref. (Black)
GND (Green)
10

Installation
Hydro-Air P-38
10 pH / ORP Analyzer
4.2.3. Differential Sensor
Differential Sensor features an Active Electrode (pH), a Reference Electrode (Ref.),
a built-in Grounding Electrode to eliminate noise / disturbance and a built-in
Temperature Electrode for temperature compensation. The sensor also features a
built-in pre-amplifier which enables an installation exceeding 25m cable length
while maintaining excellent reading accuracy and consistency. The short pin is
required in this setup.
Figure 6 Connection figure for Differential Sensor
12
10
pH (Red)
Coaxial
cable
Sensor Body
Built-in Temperature Electrode
T/P or Temp. (Pt1000 / NTC10K) (Yellow)
Ref. (Green)
6
5
11
Built-in Temperature Electrode
T/P or Temp. (Pt1000 / NTC10K) (Black)

Hydro-Air P-38
User Interface
pH / ORP Analyzer 11
5.0 User Interface
5.1. Front Screen
WARNING!
Before proceeding, ensure that the installation instructions have
been followed correctly. Failure to do so may result in an
electrically hazardous installation or irreparable damage to the
instrument.
P-38 is accompanied by five control buttons whose function varies depending upon
which screen the user is viewing. The button function is indicated by the control
section at the bottom of the display.
Figure 7 Keypad and front panel overview
NO.
DESCRIPTION
1
Controller display
2
MODE / ESC key. From the Operation screen, press MODE to enter the Main
Menu for operation configurations. Press ESC to navigate back to the previous
page.
3
CAL / ↔ SHIFT key. From the Operation screen, press CAL to enter the
Calibration page. Press ↔ SHIFT to navigate to the left either to change options
or values.
4
UP key. Press UP to navigate through the menus, change settings, and increment
of digits.
5
DOWN key. Press DOWN to navigate through the menus, change settings, and
decrement of digits.
6
ENTER key. Press ENTER to accept input values, updates, or turning on/off the
backlight key in the Operation screen.

User Interface
Hydro-Air P-38
12 pH / ORP Analyzer
Figure 8 Operation screen overview
NO.
DESCRIPTION
1
Operation status
2
Measurement value
3
Measurement unit
4
Temperature and unit
5
Temperature compensation: Auto (ATC) or Manual (MTC)
6
Current output value
7
Relay A status
Relay A deenergized
Relay A energized
8
Relay B status
Relay B deenergized
Relay B energized

Hydro-Air P-38
User Interface
pH / ORP Analyzer 13
5.2. Main Menu
DISPLAY
INFO
The first page of the Main Menu displays the
following configurations:
•4-20mA
•Relay A
•Relay B
•Measurement
•Temperature
The second page of the Main Menu displays the
following configurations:
•RS-485
•Simulator
•Language
•Default
•Version

Advanced Operation
Hydro-Air P-38
14 pH / ORP Analyzer
6.0 Advanced Operation
This section describes the operational settings of the controller.
6.1. 4-20mA (Current Output Settings)
DISPLAY
FUNCTIONS
04.00mA:
Set the value corresponding to 4.00mA output
pH : 0.00 to 14.00pH
ORP : -2000 to 2000mV
20.00mA:
Set the value corresponding to 20.00mA output
pH : 0.00 to 14.00pH
ORP : -2000 to 2000mV
Offset:
Current output adjustment
Range : -1.00 to +1.00mA
6.2. Relay A Settings
DISPLAY
FUNCTIONS
Example:
If an acid dosing pump is required
to run at pH 10 and to stop at pH 4,
then set Run=10.00pH and
Off=04.00pH
Status:
Enable / Disable Relay A
Run:
Set point value to energize Relay A
pH : 0.00 to 14.00pH
ORP : -2000 to 2000mV
Off:
Set point value to deenergize Relay A
pH : 0.00 to 14.00pH
ORP : -2000 to 2000mV

Hydro-Air P-38
Advanced Operation
pH / ORP Analyzer 15
6.3. Relay B Settings
DISPLAY
FUNCTIONS
Example:
If an alkali dosing pump is required
to run at pH 4 and to stop at pH 10,
then set Run=04.00pH and
Off=10.00pH
Status:
Enable / Disable Relay B
Run:
Set point value to energize Relay B
pH : 0.00 to 14.00pH
ORP : -2000 to 2000mV
Off:
Set point value to deenergize Relay B
pH : 0.00 to 14.00pH
ORP : -2000 to 2000mV
6.4. Measurement Settings
DISPLAY
FUNCTIONS
Mode:
Set the parameter to measure
Parameters: pH / ORP
Offset:
Parameter value adjustment
pH : -1.00 to +1.00pH
ORP : -100 to +100mV

Advanced Operation
Hydro-Air P-38
16 pH / ORP Analyzer
6.5. Temperature Settings
DISPLAY
FUNCTIONS
Status:
Set the mode for temperature compensation
Auto : ATC
Manual : MTC
Type:
Set the type of temperature probe used (ATC only)
Probes : Pt1000 / NTC10K
Offset:
Temperature value adjustment (ATC only)
Range : -5.0 to +5.0℃
Manual:
Set the temperature of solution (MTC only)
Range : -10.0 to +130.0℃
6.6. RS-485 Settings
DISPLAY
FUNCTIONS
Mode:
Set the ID Address for RS-485 Modbus protocol
ID Address : 001 to 255