Pyxis ST-774 Bedienungsanleitung

ST-774 Porta-Panel

Ultra-Low Dissolved Oxygen

Analyzer User Manual

May 2021

 
 
Catalog 
 Specifications.............................................................................................................................................- 1 -
1.1. Porta-Panel Description, Specifications + Dimensions..............................................................................- 1 -
 Unpackaging ..............................................................................................................................................- 5 -
 4-20mA Wiring........................................................................................................................................... - 5 -
 Sample and Calibration Gas Connection.....................................................................................................- 6 -
4.1. Sample Water Connection ........................................................................................................................- 6 -
4.2. Calibration Gas Connection.......................................................................................................................- 6 -
 UC-50 Operation ........................................................................................................................................- 7 -
5.1. Main Screen ..............................................................................................................................................- 7 -
5.2. Button Functions.......................................................................................................................................- 8 -
5.3. System Information...................................................................................................................................- 8 -
5.4. Calibration .................................................................................................................................................- 9 -
5.4.1. Zero Calibration ................................................................................................................................- 9 -
5.4.2. Slope Calibration ..............................................................................................................................- 9 -
5.5. 4-20 mA Output Setting ..........................................................................................................................- 10 -
5.6. Historical Data and Historical Trend ........................................................................................................- 10 -
5.7. USB Operation.........................................................................................................................................- 11 -

- 1 -

Specifications

Please reference the ST-774 manual for the full specifications on the ultra-low dissolved oxygen sensor.

1.1. ST-774 Porta-Panel Overview + Specification (P/N 42096)

Product Description

The ST-774 Porta-Panel (P/N-42096) is a prefabricated panel ideally

suited for those desiring to use the ST-774 Ultra-Low DO sensor

with local display and data acquisition in a portable fashion for

oxygen measurement (ie. deaerator performance studies). The

Porta-Panel is pre-mounted on an easy-carry self-standing 316L

stainless-steel panel with the ST-774 sensor, flow-cell and

appropriate water sample/calibration gas flow hardware. The

panel comes equipped with an integrated UC-50 Display/Data

Logging Terminal for connected to the ST-774 via RS-485 Modbus

offering live data display, calibration interface and data logging of

the sensor. The UC-50 offers 1x contact relay output and has RS-

485 Modbus and 1x 4-20mA outputs for passing the sensor value

onto another device. The UC-50 also offers Bluetooth 5.0

capability for those desiring to use the uPyxis mobile or desktop

apps for wireless calibration and diagnostics of the Pyxis sensor

connected.

Product Features

•Ideal for Dissolved Oxygen Studies

•Portable Free-Standing Panel –316L SS

•Fully Integrated Plumbing + Flow Cell

•Measurement of Water Sample or Calibration Gas

•Premounted ST-774 Ultra-Low DO Sensor

•0.0-2,000 μg/L measurement range

•0.1 μg/L Lower Limit of Detection

•Built-in temperature and pressure sensors

•Premounted UC-50 Data Logger + Display Panel

•Direct RS-485 Modbus Connection to UC-50 Display

•Fully Integrated Zero + Slope Calibration Interface

•Integrated 4-20mA + RS-485 Output

•1x Contact Alarm Relay and USB Data Logger

- 2 -

ST-774 Porta-Panel Diagram (mm)

Figure 1 - ST-774 Porta-Panel (P/N-42096)

- 3 -

ST-774 Description

The Pyxis ST-774 is an ultra-low range dissolved oxygen (DO) sensor with a lower limit of

detection 0.1 ppb (g/L). It is design is based on the principle of fluorescence quenching

to determine the partial pressure of the dissolved oxygen in water and incorporates Pyxis'

advanced technology in the field of fluorescence detection. The Pyxis ST-774 offers the

robustness associated with optical DO sensor technology while achieving the ultra-low

detection limit compatible to an amperometric DO sensor. The ST-774 measures the

oxygen partial pressure that is at equilibrium with the dissolved oxygen in water governed

by Henry’s law (DO/ppb = K PO2) .The embedded process control board within the ST-774

uses the latest USGS equations to convert the built-in partial pressure and temperature

measured to a DO value in ppb (or g/L).

The ST-774 offers an easily replaceable, front loading DO membrane cap that has been

independently developed by Pyxis Lab, with a typical service life of up to two years. The

flat front-end design of the ST-774 makes this platform less prone to contamination or

fouling and is very easy to clean. The sensor body is composed of 316L stainless steel and

is well suited for aggressive industrial application use. The ST-774 sensor is connected via

RS-485 Modbus output when packaged on the ST-774 Porta-Panel (P/N 42096) portable

dissolved oxygen analyzer.

ST-774 Sensor Specifications

Item

ST-774

P/N

53715

Measuring Range

0.00 - 2,000 μg/L (ppb)

Limit of Detection (LOD)

0.1 μg/L (ppb)

Resolution/Repeatability

0.1 μg/L (ppb)

Accuracy

± 0.3 μg/L (ppb) or ± 1%, whichever is greater

Light Source

Blue Light Exc / Red Light Emm

Response Time (90%)

<30s Liquid Phase / <10s Gas Phase

Operational Temperature

0 °C –50 °C (32 - 122° F)

Operating Voltage

22 –26V DC, Power 0.6W

Signal Output

4-20mA analog output / RS-485 digital output

Dimension (L x D)

300 x 60mm (11.8 x 2.36 inches)

Sensor Weight

2150 g (4.74 lb) cable excluded

Total Panel Weight

7257 g (16 lb)

Suggested Flow Range

50 –500 mL/Minute

Sample Connection Format

Sample Line & Inlet Stainless Steel with Compression Fitting

Material

316L stainless steel

Working Pressure

145psi (10Bar)

Wet Material

316L stainless steel / PVC and polycarbonate

Calibration

High = 0.1% O2in N2Gas / Low = 99.9999% N2Gas

DCC-2 Cartridge Life

2 years

Protection / Regulation

IP-67-IP-68 / CE / RoHS

Figure 2

ST-774 DO Sensor

w/Flow Cell

- 4 -

UC-50

The Pyxis UC-50 is a preconfigured push-button color micro-

display and data logging terminal that can connect any Pyxis

sensor via RS-485, 4-20mA or BlueTooth 5.0 connectivity.

This microprocessor-based display requires no configuration

when connected to Pyxis inline sensors. When Pyxis sensors

are landed via RS-485 modbus, the UC-50 immediately

recognizes the sensor for live sensor value, color trend charts

as well as sensor diagnostics and calibration interface while

logging data for USB download. The UC-50 provides RS-485

and 1x 4-20 mA outputs as well as one Relay output for

connection to additional controllers, PLC or DCS systems.

The UC-50 is premounted as part of the ST-774 Porta-Panel

Dissolved Oxygen Analyzer.

Specifications

Item

UC-50

P/N

43007

Power

110/220VAC 50/60 Hz, 0.6A

Display

2.8” Color 320 x 240 Resolution

Output

1 x 4-20 mA / RS-485 Modbus-RTU

Input

1 x 4-20 mA / RS-485 Modbus-RTU

Relay Output

One channel relay output – 24VDC/10Watt Maximum

Data Storage

32M Flash

USB

1 x USB host for data downloading

Dimension

6.3 inch L x 3.9 inch W x 2.6 inch D

Weight

4.6 lbs / 2.1 kg

Operation Temperature

32 – 122 oF (-0 – 50 oC)

Storage Temperature

-4 – 158 oF (-20 – 70 oC)

Humidity

5 – 95% No Condensation

Protection

IP-65

BlueTooth

BlueTooth 5.0 - Capable of Reading Pyxis Bluetooth Sensors

Regulation

CE, RoHS

Figure 3

UC-50 Display + Data

Logging Terminal

- 5 -

*As Pyxis technology is continuously updated, this technical parameter may change at any time without notice;

Unpackaging

The package includes the following items mounted on the panel

•ST-774 Porta-Panel Dissolved Oxygen Analyzer System (P/N 42096)

o316L Portable Panel with ¼” SS Tubing Swagelok and Micro Rotameter

oST-774 DO Sensor premounted with flow cell

oPremounted – Prewired – Preconfigured UC-50 Display/Data Logging Terminal

*NOTE* Gas Calibration Cylinders are sold separately.

Optional Accessories –Not Included On Standard Panel

P/N

DCC-3 Pure Nitrogen Gas 99.9999% Cylinder –58L - Replacement

42059

DCC-4 Oxygen Gas 0.1% in Nitrogen Cylinder –58L - Replacement

42060

Order Information P/N

ST-774 Porta-Panel (Portable Panel Mounted ST-774 w/Flow Cell + UC-50 Data Logger) 42096

Optional Accessories Information P/N

ST-774 Flow Cell Assembly (316L Flow Cell w/SwageLok For Spare Use or Replacement) 53718

DCC-2 (Replacement Dissolved Oxygen Membrane Cap for ST-774) 53716

DCC-3 (Replacement Nitrogen Gas Cylinder for Zero Calibration / 99.9999% Pure / 58L) 42059

DCC-4 (Replacement Oxygen Gas Cylinder for Slope Calibration / 0.1% Oxygen / 58L) 42060

UC-50 (UC-50 Micro Display + Data Logging Terminal) 43007

MA-50CR (50-foot Extension Cable w 8Pin Quick Adapters) 50743

- 6 -

4-20mA Output Wiring

Figure 4. 4-20mA Output Wiring

Sample and Calibration Gas Connection

4.1. Sample Water Connection

Connect the sample to the water inlet port via a ¼ Swagelok tubing fitting and operate at a flow of 50-

500mL/minute for optimum accuracy. To ensure a sample free of oxygen ingress, only compression style

fittings (ie. Swagelok) and stainless steel sample tubing should be used. Never use plastic tubing for the

sample line or threaded fittings or oxygen ingress may occur. With proper installation using stainless steel

sample lines and thoroughly tightened compression fittings, the ST-774 should stabilize to a low level

within a few hours after startup. Once this has occurred, you may proceed with the oxygen

study/evaluation. If stabilization of the sensor takes a longer period of hours or days, please evaluate your

installation for oxygen ingress into the sample line and other on-site application parameters (ie. deaerator

operating temperature, pressure, feedwater flow rates, loss of oxygen scavenger feed etc.)

Tightly connect the cooled sample water inlet to the bottom sample in line. Connect the outlet flow line

to drain. Note, the outlet flow line can utilized poly tubing if desired. Ensure the pre-inlet valve is in the

open position. Slowly open the inlet valve allowing cooled sample to enter the inline rotameter. Adjust

inlet sample flow to a range of 50-500mL/minute on the rotameter. Allow your ST-774 sensor to stabilize

by observing the display value on the UC-50 display/data logging terminal. Your ST-774 comes

precalibrated from the Pyxis production facility and should not need calibration or maintenance for a

period of up to one year with proper use.

4.2. Calibration Gas Connection

Before connecting the calibration gas to the gas inlet port on the bottom right of the panel via a ¼ inch

Swagelok fitting, open the pre-sensor valve to allow gas flow to drain. Adjust rotameter to the open

position allowing calibration gas to pass by the ST-774 sensor.

- 7 -

Ultrapure nitrogen gas (Pyxis DCC-3 P/N 42059) is recommend for the zero calibration. The slope calibration

requires 0.02% to 0.1% (or 200 to 1000 ppm) oxygen in nitrogen gas (Pyxis DCC-4 P/N 42060). The user can

connect the gas source to the gas inlet port. Portable standard calibration gas cylinders can be purchased

from Pyxis if desired. *NOTE* Pyxis does not provide the C-10 regulating valve for gas cylinders.

For low pressure applications users may also conduct ZERO calibration of the ST-774 sensor with 5% cobalt

catalyzed sodium sulfite solution.

As an alternative and far faster/easier option, Pyxis Lab offers ST-774 SERVICE SWAP (P/N ST-774 SWAP).

This service provides the user with a new or reconditioned ST-774 sensor calibrated and ready for service

in exchange for the unit in need for calibration/service removed from the system. Contact Pyxis Lab for

details at [email protected]om .

UC-50 Operation

5.1. Main Screen

The UC-50 is configuraed to read and display measurement data from the Pyxis ST-774 dissolved oxygen

probe. The system time, ST-774 DO ppb reading and the sample temperature measured by the ST-774 are

displayed on the main screen. The green dot on the upper right of the screen indicates normal

communication between the UC-50 and the ST-774 probe. In the bottom of the screen, the analog input

(AI) value, the analog output (AO) value, and the relay status are shown.

Figure 5. Main Screen

- 8 -

5.2. Button Functions

The house button on the left is for returing to the main screen from any screens. The left arrow button

(second from the left) is for returing to the previous screens. The up and down buttons are for selecting

items on the screen by moving the selection focus up, down, left, or right. The up and down buttons are

also used to enter a numerical input. Single click or hold on these two buttons will increase or descrease

the numerical value in the selected input fields. The OK button is for the selection confirmation, like the

enter key on a computer keyboard.

5.3. System Information

Click the left arrow button to launch the system settings screen. Use the down button to select System

Information. The UC-50 serial number, the hardware version and software version are shown in the System

Information screen. Use the down button to hightlight the Time field. Reset date or time if necessary.

Figure 6. Settings

Figure 7. System Information

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