Q46H/62 System Specifications

Displayed Parameters :

  • Main input, 0.1 ppb (0.0001 ppm) to 200.0 ppm
  • Sensor temperature, -5.0 to 55.0 °C (23 to 131 ºF)
  • Sensor Current, 0.0–999.9 nA, 0.000 to 99.99 uA
  • Loop current, 4.00 to 20.00 mA
  • Sensor slope/offset
  • Model number and software version
  • PID Controller Status
  • Optional pH Input value.0.00 to 14.00 pH

Main Parameter Ranges :

Manual selection of one of the following ranges,

  • to 200.0 ppb
  • to 2.000 ppm
  • to 20.00 ppm
  • to 200.0 ppm

Display :

0.75” (19.1 mm) high 4-digit main display with sign 12-digit secondary display, 0.3″ (7.6 mm) 5×7 dot matrix. Integral LED back-light for visibility in the dark.

Keypad :

4-key membrane type with tactile feedback, polycarbonate with UV coating

Weight :

2 lb. (0.9 kg)

Ambient Temperature :

  • Analyzer Service, -20 to 60 °C (-4 to 140 ºF)
  • Sensor Service, -5 to 55°C (23 to 131 °F)
  • Storage, -5 to 70 °C (-22 to 158 ºF)

Ambient Humidity :

0 to 95%, indoor/outdoor use, non-condensing to rated ambient temperature range

Altitude : Maximum 2000 m (6562 ft.)

Electrical Certification : Ordinary Location, cCSAus (CSA and UL standards – both approved by CSA), pollution degree 2, installation category 2

EMI/RFI Influence : Designed to EN 61326-1

Output Isolation : 600 V galvanic isolation

Filter : Adjustable 0-9.9 minutes additional damping to 90% step input

Temperature Input : Pt100 RTD, 3-wire type

Sensor : 2-electrode polarographic membraned sensor for direct measurement of chlorine

Sensor Materials : Noryl and stainless steel

Sensor Cable :  25 ft. (7.5 meter) cable with 6-pin plug

Sensor-to-Analyzer Distance : 100 feet (30.5 meters), with junction box

Optional pH Comp Input : Accepts standard combination or Q22P pH Sensors

Flow Cell :

Constant head overflow, clear cast acrylic, 7-30 GPH, 15 GPH recommended, inlet is ¼” hose barb at 1/8” MNPT, outlet is ½” hose barb at 3/8” MNPT

Power :

  • 90 – 260 VAC, 50-60 Hz, 10 VA max
  • 12-24 VDC, 500 mA max.

Enclosure :

  • NEMA 4X, polycarbonate, stainless steel hardware,
  • HWD: 4.9″ (124 mm) x 4.9″ (124 mm) x 5.5″ (139 mm)

Mounting Options :

Wall or pipe mount bracket standard. Bracket suitable for either 1.5” or 2” I.D. U-Bolts for pipe mounting. Panel mount adapter optional.

Conduit Openings :

Five ½” NPT openings, Adapter can be removed to provide a 1” NPT opening in the bottom of the enclosure. Gland seals provided but not installed.

Relays, Electromechanical:

Three SPDT, 6 amp @ 250 VAC, 5 amp @ 24 VDC contacts. Software selection for setpoint, phase, delay, deadband, hi-lo alarm, and failsafe.A-B indicators on main LCD, and C indicator on lower display.

Analog Outputs :

Two 4-20 mA outputs. Output one programmable for PPM chlorine or PID. Output 2 programmable for PPM chlorine, Temperature, or pH. Max load 500 Ohms for each output. Outputs ground isolated and isolated from each other. An additional 3rd analog option is available.

For more Information contact : [ 021 8800 154 ]
WhatsApp : Klik >

Q46H Performance Specifications

Accuracy : 0.5% of selected range or 0.02 PPM

Repeatability : 0.3% of selected range or 0.01 PPM

Sensitivity : 0.05% of selected range

Non-linearity : 0.1% of selected range

Warm-up Time : 3 seconds to rated performance (electronics only)

Supply Voltage Effects : ± 0.05% span

Instrument Response Time : 60 seconds to 90% of step input at lowest damping

For more Information contact : [ 021 8800 154 ]
WhatsApp : Klik >



Features : 

  • Available in either 90-260VAC or 12-24 VDC power supply systems. All features remain the same in both variations.
  • High accuracy, high sensitivity system, measures from 20 ppb to 200.0 ppm through 4 internal automatic ranges. User ranges of 200.0 ppb, 2.000 ppm, 20.00 ppm, or 200.0 ppm.
  • Output Hold, Output Simulate, Output Alarm, and Output Delay Functions. All forced changes in output condition include bumpless transfer to provide gradual return to on-line signal levels and to avoid system control shocks on both analog outputs.
  • Three 6 amp SPDT relay outputs and two analog 4-20 mA outputs are standard. Software settings for relay control include setpoint, deadband, phase, delay, and failsafe. An optional 3- relay card, for 0-30 V signals, is available to bring the total to 6 relays.
  • Selectable PID controller on main analog output. PID controller can operate with instrument configured as loop-power analyzer or as one of the two outputs on the AC powered instrument. PID includes manual operation feature, and diagnostic “stuck-controller” timer feature for alarm output of control problems.
  • Digital communication option for Profibus-DP, Modbus-RTU. More versions pending. See Q46 Digital Communications Manual for Specifications.
  • Two analog outputs may be configured to track chlorine and temperature, chlorine and chlorine, or chlorine and pH. Both analog outputs can be individually programmed to fail to specific values. An optional third analog output is available, providing separate outputs for chlorine, pH, and temperature.
  • Selectable automatic pH compensation feature. Enables active pH compensation of free chlorine readings – requiring no pumps or buffers to maintain a constant pH level. The pH reading can also be sent to one of the analog outputs for complete pH + chlorine monitoring. The pH correction can be done using ATI’s optional pH sensor or using an input signal of 0.4-2.0 VDC (4- 20 mA across a 100 ohm resistor) from another pH monitor. Input from another monitor requires the use of a loop isolator.
  • Selectable Output Fail Alarm feature allows system diagnostic failures to be sent to external monitoring systems.
  • Diagnostic messages provide a clear description of any problem with no confusing error codes to look up. Messages are also included for diagnosing calibration problems.
  • Quick and easy one-point calibration method and sensor zero-cal. To provide high accuracy, all calibration methods include stability monitors that check temperature and main parameter stability before accepting data.
  • High accuracy three-wire Pt100 temperature input. Temperature element can be user calibrated.
  • Security lock feature to prevent unauthorized tampering with analyzer settings. All settings can be viewed while locked, but they cannot be changed.

Q46H-62 Free Chlorine Measurement System

For more Information contact : [ 021 8800 154 ]
WhatsApp : Klik >

Monitor Your Chlorine Reagent Free!

ATI’s Chlorine Monitor is an upgraded version of our proven Q45H system for continuous water quality monitoring of free or combined chlorine. Monitor capabilities have been expanded to include options for a 3rd analog output or for adding additional low power relay outputs. Digital communication options for Profibus DP, Modbus RTU or Ethernet IP have been added, as well.
The Q46H system uses a polarographic membraned sensor to measure chlorine directly, without the need for chemical reagents. When needed, automatic pH compensation may be added for highest free chlorine measurement accuracy. Systems are available to provide 4-20 mA outputs for chlorine, pH, and temperature to allow easy CT calculations.
Q46H systems are economical to purchase, economical to maintain, and provide long term accuracy and reliability for your chlorine monitoring needs.
Want to simplify installation?
ATI can supply the Q46H complete with sample flow controls mounted to a PVC back plate ready to mount. Connect power, water sample, and analog/relay outputs and you’re ready to go. Systems are available with or without a flow switch for remote indication of loss of sample.


Two types of chlorine sensors are available. One is designed for flowcell installation, and the other is for submersion applications. Free chlorine monitoring should always be done using a flowcell system. Good control of sample flow and pressure is important for accurate measurement. The standard constant-head flowcell should be used for most applications. A sealed flowcell and a low-volume flowcell are also available for special applications. Consult your ATI representative for application assistance.

Submersible combined chlorine sensors can sometimes be used for measuring total chlorine in wastewater effluent. Wastewater effluents containing more than 1 PPM of ammonia, often result in a chlorine residual that is more than 90% monochloramine. Direct measurement with a submersible sensor can provide a dependable monitor without all the sampling and chemicals associated with total chlorine measurement.

Say Goodbye to Buffers & DPD Reagents Forever!

  Submersion & Flowcell Sensors       Constant Head Flowcell       Sealed Flowcell


Chlorine sensors, especially free chlorine, require up to 8 hours of stabilization time when first installed or after membrane change. ATI offers a battery powered “polarizer” that can be used to stabilize a spare sensor so it is ready to run within a few minutes of installation. Polarizers simply plug into the sensor connector and require no adjustments.


Free or Combined Chlorine

Q46H Monitors are factory set for either Free or Combined Chlorine measurement, but can easily be converted from one to the other in the field.

Economical Operation

Reagent-less operation and low parts cost makes the Q46H your best choice for chlorine monitoring applications in potable water, wastewater, cooling water, or high purity water systems.

Automatic pH Compensation

For free chlorine monitoring under widely varying pH conditions, automatic pH compensation may be added to maintain the highest measurement accuracy at pH levels up to 9.5.

Dual Chlorine/pH Monitoring

Even when pH correction is not required, adding a pH sensor to the system converts the monitor to a dual analyzer, providing 4-20 mA outputs for both chlorine and pH.


Programmable range options from 0-200 PPB up to 0-200 PPM provide maximum application flexibility.

AC or DC Power Options

Power options include universal 90-260 VAC or 12-24 VDC.

Analog Output Options

Two isolated 4-20 mA outputs are standard, with an option for a third output if required. Default setting provides analog outputs for chlorine and pH.

PID Output

Standard PID control function assignable to one analog output.

Digital Communications

Available in either Profibus-DP, Modbus-RTU or Ethernet-IP.

Relay Outputs

Three SPDT relays are standard, with relay functions programmable for alarm, control, or trouble indication. Three additional low power relays available as an option.

Flexible Mounting

NEMA 4X (IP-66) enclosure is suitable for wall, pipe, or panel mounting.

Clear Display

Back-lit large LCD display provides clear visibility in any lighting conditions. A scrolling second line on the display provides additional information and programming prompts

For more Information contact : [ 021 8800 154 ]
WhatsApp : Klik >

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