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ATI's versatile Q45P/R pH/ORP system is designed for use in all industrial and municipal applications. The sensors are engineered to function normally in applications where conventional sensors quickly fail.
Conventional pH/ORP sensors have an "open reference system", which means the reference element and electrolyte are in contact with the process. This allows chemicals to diffuse into the reference chamber and alter the reference system. As the reference junction becomes contaminated, the reference potential shifts. As chemicals attack the silver reference wire, the reference potential shifts and the sensor no longer functions. When any of these problems occur, cleaning and calibration cycles increase and the sensors fail much faster, all of which costs you time and money.
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The differential pH/ORP sensors utilize a "sealed reference system", where the sensors are constructed with a second glass pH electrode as the reference element. The glass reference system protects the sensor from chemical poisons (sulfide, cyanide, chlorine, bisulfates, etc.) that destroy conventional pH sensors.
Sensor Features
- Differential Style Sensors: The reference is a second glass pH electrode immersed in a reference buffer solution. This glass reference system allows the sensor to be used in applications that poison conventional pH sensors
- PEEK Sensor Body Construction: All structural components are made of PEEK, a high performance thermoplastic that provides outstanding mechanical strength and chemical resistance.
- Replaceable Sensor Saltbridge: A large volume junction saltbridge is used to maximize the in service time of the sensor. The replaceable saltbridge allows for easy and inexpensive sensor regeneration.
- Sensor Diagnostics: Sensor diagnostics are used to alarm the user in the event of electrode breakage, loss of sensor seal integrity or integral temperature sensor failure.
- Multiple Sealing Materials: Multiple sealing materials are used to preserve sensor integrity over a wide range of chemical processes and varying temperatures
- Integral Preamplifier: The integral preamplifier is encapsulated in the body of the sensor. This creates a low impedance signal output which ensures stable readings in harsh environments and maximizes the distance between sensor and analyzer.
Monitor Features
- Loop-powered, AC or Battery Versions: This line of microprocessor based instrumentation allows for easy implementation of loop-powered or battery-powered capability within the same instrument. This instrument can be rapidly converted between any of these versions with no requirements for software change.
- Loop-powered (16-35 VDC) Transmitter, 4-20 mA output
- Line-powered (115/230 VAC) Analyzer, dual relays, dual 4-20 mA outputs
- Battery-powered (( VDC) Monitor/Data Logger, dual 0-2.5 VDC outputs
- Sensor Compatibility: Q45 monitors can accept standard pH sensor inputs, allowing easy upgrade for existing installations.
- Diagnostic Messaging: Diagnostic messages provide a clear description of system conditions, which eliminates confusing error codes that are difficult to decipher.
- Flexible Calibration: Two point and sample calibration options include auto-buffer recognition for 13 built5 in buffer tables. Manual overrides of the automatic buffer values for user to customize values. All calibration methods include stability monitors to check temperature and main parameter stability before accepting data.
- Dual Alarm/Analog Outputs: AC operated systems provide two relays that are configurable for either control, alarm or operation.
- Standard PID Output: A PID control output is standard in every Q45 pH or ORP monitor, with control parameters easily user configurable.
A large volume, dual junction saltbridge is used to maximize the in service time of the sensor. The annular junction provides a large surface area to minimize the chance of fouling. Large electrolyte volume and dual junctions minimize contamination of the reference solution. The replaceable saltbridge allows for easy and inexpensive sensor regeneration.
As integral preamplifier is encapsulated in the body of the sensor. This creates a low impedance signal output which ensures stable readings in harsh environments and maximizes the distance between sensor and analyzer. Sensor diagnostics are used to alarm the user in the event of electrode breakage, loss of sensor seal integrity or integral temperature sensor failure.
Sensor electrodes can be user specified to ensure measurement reliability and maximum sensor lifetime. The type of glass used in the pH electrodes can be selected for optimal performance. The metal electrode used for ORP measurement can be platinum or gold, depending on the chemical makeup of the process solution.
All sensors are available in several mounting configurations. The 1" NPT convertible style sensor is constructed of PEEK, a high performance thermoplastic that provides outstanding mechanical strength and chemical resistance. An insertion style sensor is available in 316SS for hot tap applications. The mounting hardware for the insertion sensor is either CPVC of 316SS and is mounted using a 1 1/4" NPT full ported ball valve. The sensors are also available with 1 1/2" or 2" sanitary style fittings.
The Q45P/R Auto-Clean System is designed to extend sensor cleaning intervals on pH and ORP sensors that are mounted in applications containing high levels of solids contamination. The Auto-Clean System uses high pressure air to remove contaminants from the face of the sensor automatically.
The Auto-Clean system utilizes a self contained compressor and air cylinder to generate a series of high pressure air blasts. Each cleaning cycle lasts approximately 2 minutes, during which the monitor outputs are placed in a HOLD condition to prevent false readings or alarms.
The concentration of solids in the process will determine the cleaning frequency of the system. The user can vary the cleaning cycle frequency from as often as once very two hours to as little as once a day.
Although the Q45 Auto-Clean System can greatly extend sensor cleaning intervals, the user must still clean and calibrate the sensor at some interval. For a typical pH or ORP measurement in wastewater treatment, the system can extend weekly cleaning intervals to once every 3 months. Cleaning systems are not suitable for removing hard scale such as that caused by lime.
Standard Sensor Compatibility
The Q45P/R monitors can be easily configured to accept the input from a traditional combination sensor. For applications where a specialty sensor is required, ATI offers a line of standard sensors to meet your needs.
The unique "Lock-N-Load" system is pipe mounted and provides quick and easy isolation of the sensor from a flowing stream. The self sealing sensor holder allows the sensor to be removed for maintenance without shutting down the process stream.
For high purity water (conductivity below 20 microSiemens), a special sensor is used in conjunction with a stainless steel flow assembly. This system is designed to minimize interference (noise, streaming potentials, CO2, etc.) and provides a stable pH measurement.
Monitor Specifications
| Display Parameters |
Main Input: pH - 0 to 14
ORP - 1000 to +2000 mV |
| Sensor Voltage: pH - +/- 500 mV |
| Loop Current: 4.00 to 20.00 mA |
| Sensor Temperature: -10 to 110°C |
| Main Parameter Range |
0.00 to 14.00 pH, -1000 to +2000 mV |
| Input Impedance |
>1013 Ohms |
| Repeatability |
0.1% of span or better |
| Sensitivity |
0.05% of span |
| Non-Linearity |
0.1% of span |
| Stability |
0.05% of span per 24 hours |
| Temperature Drift |
Span or zero, 0.02% of span/°C |
| Warm Up Time |
7 seconds to rated performance |
| Response Time |
6 seconds to 90% of step input at lowest setting |
| Max Sensor to Analyzer Distance |
3000 feet w/preamp, 25 feet w/o preamp |
| Enclosure |
NEMA 4X, IP66, polycarbonate weatherproof and corrosion resistant, 4.9" x 4.9" x 5.5" |
| Mounting Options |
Wall, panel, pipe/handrail |
| Conduit Openings |
Three M16 threaded entries, 3 cord grips and 2 conduit adapters included |
| Weight |
2 wire or battery: 1 pound
AC power units: 2 pounds
Auto-Clean units: 15 pounds |
| Display |
Large, high contrast, super twist (STN) LCD 4 digit main display with signs, 0.75" seven segment characters, 12 digit alpha numeric second line display |
| Ambient Temperature |
Service: -20 to 60°C |
| Storage: -30 to 70°C |
| Ambient Humidity |
0 to 95% non condensing |
| Location |
Designed for hazardous and non hazardous areas |
| EMI/RFI Influence |
Designed to EN 61326-1 |
| Output Isolation |
600V galvanic isolation |
| Filter |
Adjustable, 0-9.9 minutes additional damping to 90% step input |
| Temperature Input |
Selectable Pt1000 or Pt100 RTD with automatic compensation |
| Control Relays |
Two SPDT relays, 6A @ 250 VAC, 5A @ 24 VDC resistive |
| Analog Output |
Isolated 4-20 mA, 550 ohm maximum load. Two assignable 4-20 mA outputs, 550 ohm max |
| Relay Mode |
Programmable for control, alarm or timer function |
| Power |
16-35 VDC for loop powered unit; 115/230 VAC, 50/60 Hz 10 VA max 9 volt battery for battery operated portable |
| Data Logger |
Battery version only, stores 32,000 data points |
Sensor Specifications
| Measuring Range |
0 to 14 pH, -1000 to + 2000 mV |
| Sensitivity |
0.002 pH; 0.2 mV |
| Stability |
0.02 pH; 2 mV (per 24 hours, non cumulative) |
| Wetted Materials |
PEEK, ceramic, titanium, glass, Viton, EDPM
Platinum or golf (ORP only)
316 SS with sanitary or insertion body styles |
| Temperature Compensation |
Pt1000 RTD |
| Sensor Cable |
6 conductor plus 2 shields, HDPE jacket |
| Temperature Range |
-5° to 95°C |
| Pressure Limits |
0-100 psig |
| Max Flow Rate |
10 feet per second |
| Max Sensor to Analyzer Distance |
3,000 feet |
| Sensor Body Options |
1" NPT convertible, 1 1/4" insertion, 1 1/2" or 2" sanitary style |
Ordering Information
For pricing please call AFC International at 800-952-3293, 219-987-6825 or fax 219-987-6826 or email
sales@afcintl.com.
