The DS-8 Rain/Snow Sensor Controller
Automatic Activation means Lower Deicing Costs
Reliable Rain And Snow Detection
Full 30A @ 240VAC Control
Field Strap for 100-120/200-240 VAC Operation
Replaceable Remote Precipitation Sensor
Easy Installation, Full Access to Electronics
Safe Low Voltage Sensor Head
Adjustable Temperature Trigger Point
Adjustable Delay Off Cycle
Bright Off/On/Triggered LED Status Indicator
Smart "Manual On" Operates for One Delay Cycle

ETL Listed

The DS-8 is primarily designed for gutter, downspout, and roof ice melting and small satellite antenna deicing. The totally sealed, low voltage, remote mount precipitation sensor allows the user to install the small sensor head in a downspout, the bottom of a gutter, or at the end of an antenna boom, up to 10' away, while keeping the main controller in a more convenient or protected location.

The unit is housed in a two gang PVC enclosure. The overall dimensions of the DS-8 are 4"(120) x 7"(178) x 2"(70). The unit weighs 2 pounds. The user may access all electronics by removing the four front cover screws.

Wiring is performed by terminating your existing wiring to the pre-installed pigtails (see below.) The DS-8 is mounted by either attaching the mounting hub to a rigid " or " conduit or by installing screws through the four mounting tabs provided.

The DS-8 can be powered from either a 100-120 VAC or 200-240 VAC 50/60Hz source. Peak power consumption is 15 watts. Voltage selection is performed by installing provided jumpers onto the printed circuit board. The unit provides a single 240VAC @ 30A normally open load contact set. Operational temperature range is -40oC to +85oC.

An environmentally sealed control switch is provided. The "Manual On" function activates the controlled equipment for testing and special operational conditions. The "Automatic" position allows the DS-8 to handle all detections and control. The "Standby/Reset" position disables triggering and can also be used to clear the delay off timer (see below) from true or test activation. If the switch is placed in "Manual On" for less than 2 seconds, then switched back to "Automatic" the controller will execute one delay off cycle. The delay off cycle is determined by the DEL adjustment with a range of 30-90 minutes. This can be used to clear surfaces with a frost or hail buildup without the danger of leaving the system in a continuous "Manual On" condition. "Standby/Reset" can still be used to clear this delay off cycle. Remote control and monitor up to 1000 feet away is also available when the optional C/M cable listed is installed. The DS-8 is also compatible with the DP-7B, DP-7EX, and CDP-2 remote control/status panels.

"Delay Off" refers to the internal drying cycle timer of the DS-8. The timer is used to allow the DS-8 to dry the heated surface through evaporation once precipitation has stopped. The drying cycle reduces the chance that moisture left behind by the melting process will refreeze into ice. This timer is restarted by each precipitation detection. Therefore, the DS-8 will continue to operate as long as precipitation and trigger temperature is detected, then for the "Delay Off" time once rain or snow stops. The Delay Off time can be adjusted from 30-90 minutes. Proper adjustment assures drying without excessive runtime.

Trigger Temperature is adjustable from 34oF-44oF using an on-board control. When ambient air temperature is below this trigger point precipitation is assumed to be snow or freezing rain. The DS-8 can be configured to detect snow only by leaving the thermal probe connected to J2. Removing the thermal probe connection allows the unit to trigger on either rain or snow detection.

The DS-8 also has an external LED indicator, providing a method to check proper power and trigger status when the unit is mounted in a "hard to reach" location. Steady OFF indicates no power to the unit. Steady ON indicates power but no trigger. A blinking LED indicates the DS-8 is triggered and deicing is taking place.

Download or view the DS-8 Installation Manual in PDF.

DS-8 Specifications
Dimensions 4"(120) x 7"(178) x 2"(70)
Weight 2 Lbs. (0.9 Kg)
Operating Temperature -40oF to +185oF (-40oC to +85oC)
Enclosure Rating NEMA 3R 
Supply Power 100-120VAC/200-240VAC Field Selectable 15W maximum
Trigger Temperature 34oF-44oF (1.1oC-6.6oC) Field Selectable
Delay Off 30-90 Minutes Field Selectable
Load Contact Capacity 30A @ 240 VAC/100,000 operations minimum at full load

DS-8 Sensor Controller Part Numbers
Typical leadtime for a DS-8 is stock to 1 week.

Type Conduit Hub Power Pigtail Load Pigtail #1 Load Pigtail #2
DS - 8 - XXX - X X 0
| | | |
500 - 1/2" NPT 1 - #14 AWG Black, White, Green 1 - #10 AWG Yellow Not Applicable
750 - 3/4" NPT 2 - #14 AWG Black, Red, Green 2 - #10 AWG Red
3 - #14 AWG Blue, Brown, Green/Yellow

For example:
A DS-8 with a 3/4" conduit hub, European power pigtails, and yellow load pigtails would be a DS-8-750-310

Power and load pigtails are MTW UL 1015 105oC 600V and are 18" in length from base of conduit hub.

Part Number

DS-8-xxx-xx0 DS-8 with power and load pigtail set
CS-1 Control/Monitor Cable, 18", #22 AWG, 5 Conductor 300V

Replacement Parts

Part Number

MG-3 Replacement Precipitation Sensor w\10' Cable
RP-1 Thermal Probe Assembly
RP-3 Fuse Kit, A 250Vac 2AG (5)
RP-4 Override Switch w\Boot,Cable
RP-5-8 Front Cover w\Label, Gasket, 4 Cover Screws
RP-8 Voltage Selection Jumpers (2)

Need additional cable length for your remote precipitation sensor? Add up to 50 feet with the EX-50 Remote Precipitation Sensor Extension Kit!

Please call for current pricing and leadtime.
Purchase orders accepted with approved credit. Terms are net 30 days.
Shipping and applicable VAT, customs charges, brokerage fees, and duties are not included.

Visa and MasterCard accepted.
 2% surcharge on all international
 and US government credit card orders.

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Phone: 416-335-7790 or toll-free 877-335-7790

For More Information, Contact
Automated Systems Engineering, Inc.
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Colorado Springs, Colorado, USA 80909
Phone: 719-599-7477 FAX: 719-599-7482

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Last Update: 04/29/14