Filter
Top Products
Sample Sequencer
Specifications
Specification for 0-1 Volt DC Output Board
Purpose: The 0-1 VDC output board is used to provide 0-1 VDC sample point number indication. The
board includes alarm contacts for normally-open commutated alarm indication.
Inputs: None
Outputs: One 0-1 Volt DC signal to indicate respective sample point number currently in "dwell" time.
Number
of Points: 8
Relays: DPDT sealed relays, contacts rated for 250 VAC, 220VDC maximum operating voltage.
Maximum switching capacity 30W, 62.5 VA for inductive loads. The alarm contacts are
normally-open dry contacts which may be powered by field voltage (less than 30 VDC and 0.5
A) from annunciator. In lieu of this standard alarm set-up, the board can be reconfigured to
supply 6 VDC to remote devices, i.e., relay coils, to accommodate required high voltage
alarm requirements. (See Appendix A)
Specification for Remote Electronic Track & Hold Board Assembly (7-00839A)
Purpose: The remote track & hold card has four independently isolated channels which each operate in
two modes: the track mode, where the output follows proportionally to the input while contact
terminals are closed, and the hold mode, where the output value is held via digital memory
until the command is reset by contact closure.
This card is ideal for applications with analyzers being sequenced between multiple sample
lines. The hold feature permits the last reading for each of four channels to be held until the
next sequenced reading for the respective channel occurs. Use of the card prevents the non-
active channels from dropping to zero between readings thereby avoiding potential system
alarm problems.
The remote Track & Hold board is mounted in an enclosure remotely located from the Sample
Sequencer enclosure. The advantage of using the remote Track & Hold instead of the plug-in
type is that alarm contacts are available from the signal switching board. Another advantage
of the remote track and hold is that it can be configured to provide multiple isolated outputs.
If a sample point is not activated after four contact closure indications have occurred on the
board, the output of the unactivated point will become 4 mA. If no sample points on the board
are activated within 80 minutes, all four outputs will become 4 mA.
The card is versatile to accommodate many applications. Several cards may be wired
together to provide more than four channel outputs. The card is also useful for applications
where multiple outputs from one analog input signal are required. For instance, the card may
be used if separate analog signals for plant DCS and recorders are required.
Performance:
Accuracy ± .01% of span at 25°C
Response Time: One-second time constant
Temperature coefficient: ± 0.012% reading per 1°C
SENTRY Equipment Corp • P. O. Box 127 • Oconomowoc, WI 53066 • 262/567-7256 • FAX: 262/567-4523
Web: www.sentry-equip.com • e-mail: sales@sentry-equip.com
7