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149-072011 Model 2002 Vacuum Gauge Page 28 of 38
7. Relay Interface Option Board
The relay interface board is available as an option for the Model 2002. Additionally, relays may be added to
either the Digital option Board (RS-232 or RS-485) or to the Analog option Board (0-10 Volts or 4-20mA).
In either case the relays operate independently of the other options. The relay board allows the TTL logic
setpoints (High, Low) to directly control two SPDT relays. Whenever the setpoint indicator light in the
front panel is lit, the corresponding relay is energized. The relay contacts are rated for a maximum switching
current of 250VA (resistive load). Connection to the relay contacts is made via connector mounted through
the rear panel of the Model 2002. Screw terminals, on the mating connector, are designed for wire from 28
AWG through 14 AWG.
7.1. Relay Board Specifications
Each relay board consists of 2 Form C (SPDT) relays with the contacts wired in parallel.
Max. Switching power....................................................................................................................120W, 250VA
(2A @ 125VAC, 1A @ 250VAC)
Max. Switching voltage ..........................................................................................................220VDC, 250VAC
Max. Switching current ......................................................................................................................4A DC, AC
Max. Carrying current........................................................................................................................6A DC, AC
UL/CSA rating .......................................................................................................................... 1.2A @ 125VAC
................................................................................................................................................... 1.2A @ 110VDC
..................................................................................................................................................... 4.0A @ 30VDC
7.2. Relay Connector Pin Assignment