Solid-State Switch and Form C Output Wiring
The Series 3050 BTU flow monitor has one Normally Open (N .O .) solid-state switch, and one solid-state Form C relay .
See the
for maximum voltage and current ratings for each type output . These outputs are
completely independent, electrically isolated, and can be programmed as either
Pulse
or
Setpoint
outputs .
When the
Totalizer
function is selected, the unit of measure and resolution are independent from the displayed units and can
be programmed where one pulse occurs once every 0000000 .1…999999999 .0 of units selected, with any pulse width from
0001…9999 mS .
When the
Alarm
is selected as the unit of measure and the resolution is independent from the displayed units, it allows the
unit to be programmed as either a high or low rate
Setpoint
. Since the
Setpoint
,
Release Point
and their associated time delays
are fully independent, this output can be either a classical high rate or low rate alarm, depending on the settings selected .
When design planning, keep in mind that although both of these outputs can be programmed as alarm points only, the relay
provides both N .O . and N .C . contacts . The switch is a simple N .O . contact .
Example of High Flow Setpoint Control
The
Setpoint
must be a value greater than the
Release Point
.
The relay output will have continuity between its N .C . terminal and
COM
until the flow has exceeded the
Setpoint
(
SETPT
) for
a continuous period of time exceeding the
Setpoint Delay
(
SDLY
), at which time the N .C . connection will open and the N .O .
contact will have continuity to the
COM
terminal . When the flow has dropped below the
Release Point
(
RELP
) for a continuous
period of time exceeding the
Release Point Delay
(
RDLY
), the relay states will return to their original states . If the latch has been
set to
ON
, the relay will not release until manually reset once the
Setpoint
and
Setpoint Delay
have been satisfied . Sources for
the
Setpoint
control can be
Flow Rate
,
Energy Rate
,
T1
,
T2
or
Delta T
.
Example of Low Flow Setpoint Control
The
Setpoint
must be a value less than the
Release Point
.
The relay output will have continuity between its N .C . terminal and
COM
until the flow drops below the
Setpoint
(
SETPT
)
for a continuous period of time exceeding the
Setpoint Delay
(
SDLY
), at which time the N .C . connection will open and the
N .O . contact will have continuity to the
COM
terminal . When the flow has again risen above the
Release Point
(
RELP
) for a
continuous period of time exceeding the
Release Point Delay
(
RDLY
), the relay states will return to their original states . If
the latch has been set to
ON
, the relay will not release until manually reset once the
Setpoint
and
Setpoint Delay
have been
satisfied . Sources for the
Setpoint
control can be
Flow Rate
,
Energy Rate
,
T1
,
T2
or
Delta T
.
1 RELAY 1 NO
2 RELAY 1 NC
3 RELAY 1 COM
4 PULSE 1 OUT
5 PULSE 2 OUT
Figure 10: Relay and switch wiring examples
Installation
Page 12
June 2018
DSY-UM-01668-EN-02
