Sierra Monitor Corporation 4001 - Manual

Single Channel Controllers
Model 4001
Model 4011
Model 4001 and 4011 Single Channel Controllers
interface with industry standard two- or three-wire
4-20 mA sensor transmitters and provide the user
with concentration display and two independent
adjustable alarm levels.
Sierra Monitor Corporation 1991 Tarob Ct. Milpitas, CA 95035 (408) 262-6611 800-727-4377 FAX: (408) 262-9042
Two adjustable alarm setpoints with latching or
non-latching relays
4-20 mA or standard voltage/current input
Battery backup option
Chart recorder output signal
Flexibility to fit your application needs
Interfaces with industry standard sensor transmitters
Insure continuous operation
Continuous logging of concentration data
Features Benefits
The Model 4001 and Model 4011 Single Channel Control-
lers are single channel gas detection controllers that also
can be used with most industry standard 4-20 mA or other
standard voltage/current sensor transmitters. Both con-
trollers provide the user with two independent adjustable
alarm levels. In addition, the output can be continuously
sent to a chart recorder.
The alarm relays can be programmed to be either latching
or non-latching and to activate either as a rising or falling
alarm. When the controller is used with 4-20 mA sensors,
a third alarm provides a fault indication when the controller
detects loop current less than 3 mA. The alarms are ac-
knowledged via either an external reset switch or a reset
push-button on the Model 4011
Each alarm relay is fused to prevent damage from alarm
and control circuits. The relays are SPDT Form C type
rated at 5 Amps to provide direct alarm action, reducing
the need for interposing relays.
Model 4001
The Model 4001 is housed in a NEMA 4X wall mount en-
closure or the optional NEMA 7 explosion proof enclosure.
AC or DC powered versions are available. Both versions
include as standard an integral battery charger that can
provide a trickle charge to an optional battery to provide
reliable continuous service.
The 3 1/2 digit LCD display can read the concentration
or alarm setpoints. LEDs on the front panel provide
indication of all three alarms or low battery power.
Model 4011
The Model 4011 is in a 1/8 DIN panel mount enclosure.
This controller is DC powered. Optional power supply/
battery chargers can power to a single unit or up to 4 con-
trollers.
The front panel includes a 3 1/2 digit LCD display, LEDs
indicating the three alarms, reset push-button, four dis-
play selection LEDs and a Select Pushbutton. The RE-
SET button is used to reset the relays when the user has
selected Latching or Acknowledge mode. The SELECT
button steps the display through each of the four possible
selections that will be indicated by the appropriate illumi-
nated LED.
Model 4001
Model 4011