 1878GLD2
Quad AP Gold Mirror PIR  
 40' x 48' coverage 
Alternate polarity quad processing for improved
false alarm immunity
White light filter for false alarm protection
Wide temperature range (-10ºC to +50ºC)
Horizontal adjustment for flexibility
environments)
Long range mirror included
100% burn-in for high reliability
6 year over-the-counter warranty
The ASC Edge:
Alternate Polarity Quad Alternate Polarity Quad is an Ademco exclusive.
As illustrated in Figure 1, Ademco's unique detector design causes an intruder to create
opposite signals on its two alarm channels and only signals of that type will register an
alarm.
With Quads from other manufacturers, an intruder signal creates identical patterns on
both channels, this time shown in Figure 2. The problem with this is that radio
interference or power surges may also create identical patterns on both channels, and
cause an alarm on an ordinary Quad PIR.
Because Quad PIRs require that both the top and bottom elements must be intercepted at
the same time, they are ideal for preventing false alarms due to rodents (Fig. 3).
1878GLD2 Specifications:
| Detection Method |
Alternate Polarity Quad Passive Infrared |
| Coverage |
40' x 50' (12.2m x 15.2m) (wide angle mirror)
80' x 7.5' (24.4m x 2.3m) (long range/curtain mirror) |
| Detection Pattern |
12 zones (7 main, 4 intermediate, 1 downward) (wide angle mirror)
1 zone, 7 tiers (long range/curtain mirror) |
| Pulse Count |
Signal processing/instant response and normal/high sensitivity
(both installer-selectable) |
| Detectable Walk Rate |
0.5-5 ft/sec (.15-1.5m/sec) |
| Mounting |
7' (2.1m), nominal |
| Indicators |
Red LED with enable/disable link |
| Alarm Relay |
Form C, 28VDC, 1A max. |
| Input Voltage |
12VDC (voltage reversal makes PIR inoperative) |
| Current |
22mA |
| Operating Temp |
14º to 122ºF (-10ºC to 50ºC) |
| Operating Humidity |
Up to 95% RH (max.), non-condensing |
| Dimensions |
31/4" W x 45/8" H x 2" D
(85mm x 120mm x 50mm) |
Accessories:
1877SM: Swivel mount kit
1878MK-2: Recess mount kit
1878RP-2: Replacement case
How to Order:
1878GLD2--Alternate Polarity Quad PIR motion detector. Includes wide
angle and curtain mirrors,
mounting plate, and mirror masking labels
1877SM--Swivel Mount Bracket
1878MK-2--Recess mount kit
1878RP-2--Replacement case
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