PolyGard2 Series


PolyGard®2 is a family of advanced sensors and controllers for commercial gas detection, alarming, and ventilation control. Designed to meet the most rigorous international standards for performance and reliability, PolyGard®2 offers flexibility of system design, easy commissioning, and cost-effective life-cycle maintenance.


Continuous monitoring
• One (1) built-in CO electrochemical sensor
• Easy plug-in sensor
• One (1) remote analog input, 4-20 mA
• One (1) digital input
• Two (2) relay outputs:
– Four stage control
– Fail-safe assignable
• One (1) analog output, (0)4-20 mA / (0)2-10 VDC
– Selectable for low, high, or averaging
• One (1) 24 VDC switched output
• Liquid Crystal Display (LCD)
• LED status indicators
• Accepts toxic or combustible gas, refrigerant, temperature or humidity temperature remote sensor input
• Built-in horn
• Keypad user interface
• Simple menu-driven programming
• Modular technology
• Overload & short-circuit protected
• NEMA 4X enclosure
• Easy maintenance



General Specifications

Power Supply24 VAC/VDC, -20%/+15% 50/60 Hz, reverse polarity protected
Power Consumption5 VA (0.2 A) w/ (1) remote sensor connected
Sensor Performance
Gas detectedCarbon monoxide (CO)
Sensor elementElectrochemical, diffusion
RangeSpan field adjustable from 0-200 to 0-300 ppm via calibration, 0-250 ppm factory set
Stability & Resolution± 3.0 ppm of reading
Repeatability± 3.0 ppm of reading
Long term output drift< 0.4% signal loss/month
Response Timet90 < 50 sec.
Sensor life expectancy3-5 years, normal operating environment
Sensor coverage5,000 sq. ft., max 10,000 sq. ft. (465 m2, max 930 m2), under “ideal conditions”
Installation Location
Mounting height5 to 6 ft. (1.5-1.8 m) above floor
Type of Control
GeneralFour-stage (S1 to S4) control, assignable up to two (2) binary/ relay, horn/audible alarm, and 24 VDC / 50 mA switched outputs, i.e. low-high stage for relay output, horn / audible alarm and switched 24 VDC at any stage for remote alarming
Analog inputOne (1) 4-20 mA, for additional remote sensor, load < 55 mA / 200 Ω, reverse polarity protected
Analog readingCurrent and mean (average) value
Stage level/setpointField adjustable over full range, four (4) stages (S1 to S4) per analog input, assignable to current or mean (average) value
- hysteresis/ switching differentialSelectable for each sensor point
Digital inputOne (1); can be assigned to any relay (R1, R2).
- applicationRemote audio/visual alarm reset or override function
Relay outputs (R1, R2) w/ status LEDs(1) SPDT (R1), and (1) SPST-NC or SPST-NO (R2), jumper selectable
Contact rating30 VAC/VDC, 0.5 A, max.
- each stage level (S1-S4)Assignable to any relay
- sensor fail-safeAssignable to any stage level
Time delay switchingSelectable for make and brake of each sensor point (SP1 to SP2) 0‑9,999 seconds
Analog outputOne (1), (0)4‑20 mA, load < 500 Ω; (0)2-10 VDC, load > 50K Ω; jumper selectable; polarity protected, assignable to low, high or averaging of sensor inputs
VDC switched outputOne (1) 24 VDC, 50 mA max
Audible alarm83 db @ unit, enabled or disabled, selectable; assignable to stage level S1, S2, S3 or S4
Alarm acknowledgmentMenu-driven and system reset function for latched relays
User Interface
Keypad typeRefer to illustration “Keypad User Interface”
Touch buttonsFour (4)
Status LED’sFour (4), for system on, stage status, and failure
Digital displayLiquid Crystal Display (LCD), two lines, 16 characters per line, 1 digit resolution
- unit displayMenu selectable, per sensor; ppm, %v/v, %LEL, °F or % RH
Permissible ambient
- working temperature14°F to 122°F (-10°C to 50°C)
- storage temperature23°F to 86°F (-5°C to 30°C)
- humidity15 to 95% RH, non-condensing
- working pressureAtmospheric ± 10%
Enclosure (panel)
- materialPolycarbonate, UL 94-HB, fire-retardant
- conformityUL 50 standards
- colorLight gray
- protectionNEMA 4X (IP65)
- installationWall (surface) mounted, or single gang electrical box
Dimensions (H x W x D)5.12 x 5.12 x 2.95 in. (130 x 130 x 75 mm)
Cable entry3 holes for 1/2 in. conduit for wall (surface) mounting and 1 hole on back side of base plate for single gang electrical box mounting
Wire connectionTerminal blocks, screw type for lead wire
Wire sizeMin. 24 AWG (0.25 mm2) Max 14 AWG (2.5 mm2)
Wire distanceMax. loop resistance 450 Ω (= wire distance plus controller input resistance)
Weight0.6 lbs (0.3 kg)
Approvals / Listings
- unit ratingNRTL Perf Tested & Certified Conforms to STD ANSI/UL 2075 City of Los Angeles CE VDI 2053, C-No. 418791 EMV-Compliance 2004/108/EWG
- relays (R1-R2)UL Recognized, E41515 CSA, C22.2 No. 0, No. 14 (File No. LR31928)
- enclosureUL Listed, E208470 CSA Certified, E208470
WarrantyTwo years material and workmanship, 12 months normal exposure for sensor element
Enclosure Metal,
- materialGalvanized steel w/zinc coating, corrosion resistant
- colorLight gray
- protectionNEMA 1, general purpose
- installationWall (surface) mounted, or single gang electrical box
Dimensions (H x W x D)5.59 x 5.59 x 2.48 in. (142 x 142 x 63 mm)
Cable entry3 holes for 1/2 in. conduit for wall (surface) mounting and 1 hole on back side of base plate for single gang electrical box mounting

Order Form