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Helios PD2-6100 Strain Gauge, Load Cell, and mV Meter
Non-Latching Relay (Auto)
In this application, the meter is set up for automatic
reset (non-latching relay). Acknowledging the alarm
while it is still present has no effect on either the LED
or the relay. When the alarm finally goes away, the
relay automatically resets and the LED also goes off.
Automatic reset only
Condition
LED
Normal
Off
Alarm
On
Ack (No effect)
On
Normal
Off
Non-Latching Relay with Manual
Reset (A-nman)
In this application, the meter is set up for automatic
and manual reset at any time (non-latching relay).
The LED and the relay automatically reset when the
meter returns to the normal condition.
In addition, the relay can be manually reset while the
alarm condition still exists, but the LED will stay on
until the meter returns to the normal condition.
Automatic + manual reset at any time
Condition
LED
Normal
Off
Alarm
On
Normal
Off
Next Alarm
On
Ack
On
Normal
Off
Latching Relay (LatcH)
In this application, the meter is set up for manual
reset at any time. Acknowledging the alarm even if
the alarm condition is still present resets the relay and
turns off the LED.
Manual reset any time
Condition
LED
Normal
Off
Alarm
On
Ack
Off
In this application, the meter is set up for manual
reset only after the signal passes the reset point
(alarm condition has cleared). Acknowledging the
alarm while it is still present has no effect on either
the LED or the relay. When the alarm is
acknowledged after it returns to the normal state, the
LED and the relay go off. Notice that the LED remains
Relay
on, even after the meter returns to the normal
condition. This is because, for latching relays, the
Off
alarm LED reflects the status of the relay, regardless
On
of the alarm condition.
On
Off
Condition
Normal
Alarm
Ack (No effect)
Normal
Ack
Relay
Off
On
Off
On
Off
Off
Relay
Off
On
Off
38
Latching Relay with Clear (Lt-Clr)
Manual reset only after
alarm condition has cleared
LED
Off
On
On
On
Off
Light / Horn / Button Accessories
Add visible and audible ways to indicate
alarm conditions on any Helios meter with
the
MOD-PD2LH
Light / Horn / Button
accessories. The light with built-in 85 dB
horn, and button come mounted and wired
to the Helios. An external 24 VDC power
supply (PDA1024-01) is required to power
the Light / Horn. Meter and accessories are
ordered as separate items. See Ordering
Information on page 6.
Instruction Manual
Relay
Off
On
On
On
Off
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