Q8-O3-1P-R-X | ACI | Gas & Specialty Sensors





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product family specifications

Supply Voltage

 VDC Supply Voltage: 24 VDC nominal (+18 to 30 VDC)

 VAC Supply Voltage: 24 VAC nominal (+15 to 24 VAC, AC Power must not be Grounded)

Fuse Protection

 0.750A Polyswitch; (Automatically resets after fault is cleared & power to circuit is removed)

Supply Current | Power Consumption

 0.3A maximum | 8.4 VA

Output Signals

 4-20 mA, 1-5 VDC or 2-10 VDC 

 (4-Wire; Power, Power Ground, Output Signal, Output Signal   Common) 

Load Impedance

 4-20 mA Output: 600 Ohms maximum | 1-5 VDC or 2-10 VDC: 3000 Ohms minimum

Communication Protocols

 RS-485 Modbus or OptoMux Proprietary Protocol (M-Controller, Q-Controller & Q4C Controller)


 LCD Graphic Display with backlight (Displays TWA, STEL and Peak Daily Value)


 Three (Non-Intrusive) Magnetic Switches

Relays | Contact Type | Relay Contact Ratings

 Three, SPDT (Form 1C) Dry Contacts rated 1.0A max. @ 30 VDC or 0.3A max. @ 125 VAC   (Resistive Load)

Status LEDs

 Two Green LED’s (Tx/Rx Communication Status), Three Red LED’s (Relays 1, 2, & 3 Status)

Factory Calibrated Range


 See Gas Sensor Selection & Specication Table on back of data sheet

Sensor Warm-Up Time

 24 Hours (Allow 24 hours before calibrating sensor after initial installation)

Sensor Type

 See Sensor Technology Type in Table on back of Product Data Sheet

Sensor Gas Types

 Combustible and Toxic Gases/Oxygen Sensor

Sensor Life Expectancy

 Toxic/Electrochemical Sensors: 2 to 3 Years , typical Oxygen/Hydrogen: 18 months, typical

 Combustible/Catalytic: 3 to 5 years, typical

Unit Shelf Life

 Toxic: 6 Months from date of purchase (Must be installed and operational)

 Combustible: 1 Year from Date of Purchase (Must be installed and operational)

Replacement Sensor

 See User’s Manual or Contact ACI

Recommended Maintenance

 Combustible Sensors: Accuracy & Bump test every 3 months or as required by Code

 Toxic Sensors: Accuracy & Bump test every 6 months or as required by Code

Enclosure Specifications (Type, Material Type,

Flammability, NEMA/IP Rating, Explosion Proof)

 Industrial Connection Head; Cast Aluminum Epoxy Coated

 NEMA 4X (IP66), Division 1 Division 2, ANSI/ISA 12.22.01 Class I Zone 1 AEx d II C, IP66 Zone 1

 CSA E60079-1 Ex d II C, Class I, Zone I, IP 66

 CSA C22.2 No. 30 Class I, Groups A, B, C, D; Class II Groups E, F, G; Class III

Conduit Connection

 Two ¾” NPT threaded openings

Operating Temperature | Humidity

 See Sensor Selection & Specifications Table on back of data sheet | 5 to 95% RH, non-condensing

Operating Atmospheric Pressure

 14.696 psi (1.0132 bar) +/- 10%

Recommended Storage Temperature/Humidity

 32 to 68ºF (0 to 20ºC) | 5 to 95% RH, Non-Condensing

Wiring Connections | Wire Size

 Depluggable Screw Terminal Blocks, 16 to 24 AWG (0.51 to 1.30 mm) Shielded Twisted Pair

Communications Cable

 Belden 9841 or Equivalent, 120 Ohms Input Impedance

Terminal Block Torque Rating

 0.37 ft-lb (0.502 Nm) Nominal

Coverage Area | Mounting Height


 See Gas Sensor Selection & Specication Table on back of data sheet


 RoHS, CSA- Class 4828-02 inspected to C22.2 No. 30 and No. 142 (CSA File #: 088890_0_000)

Product Weight

 4.35 lbs. (1.973 kg)

Product Dimensions (L x W x H)

 7.48” (190 mm) x 5.71” (145 mm) x 5.12” (130 mm)

product family features

Comes standard with an integral clock 

Available for toxic and combustible gases 

Monitors gas concentrations 

more information & related documents

Family Description

The ACI Q8 Series of explosion-proof gas detectors are used in applications that require a rugged enclosure that meets Class 1 Division 2 requirements. Each unit comes standard with an integral clock, digital display of concentration, relay status, and peak daily values of the gas being detected. A three-color backlight will flash depending on the level of alarm for operator safety. Setup and calibration are accomplished through non-intrusive magnetic switches that allow programming for all parameters. A remote sensor option is available for toxic and combustible gases and should be used in applications where the main unit can be mounted 3- 6 feet off of the floor with the remote sensor being at the ceiling or floor levels to monitor the gas concentrations. Mounting height and remote sensor location depend on the gas being monitored. Sensor types include electrochemical and catalytic bead sensors to meet the demand and performance requirements for particular industries.

Kele Description




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