Model PD750, PD751, PD752 Universal Temperature Meters
Instruction Manual
RELAYS (Optional)
The meter is available with 2 and 4 relays. The SPDT relays can be programmed
for automatic or aut manual reset. The relays can also be programmed for
0-100% deadband.
Set and Reset Point Programming
Refer to page 13 to program the alarm (relay) set and reset points.
Automatic and Manual Reset Programming
There are two ways to reset the relays:
1. Automatically when the signal passes through the reset point.
2. Automat manually via the front panel ACK button, or a user supplied
switch across terminals at the rear of the instrument. That is, a relay may be manu-
ally reset prior to the signal passing through the reset point, or, if it is not, it will auto-
matically reset when the signal passes through the reset point.
A manual reset will reset all relays that are programmed for aut manual
reset.
An array of jumpers located behind the front panel on the Display Board is used to
program each relay for either automatic or aut manual reset. Refer to page
21 for front panel removal instructions. The top jumper is used for relay 1, the next
for relay 2, etc. A relay will automatically reset if no jumper is installed. A relay will
automatically reset, plus can be manually reset, if a jumper is installed over its
respective pins.
Jumpers to program relays for either automatic or aut manual reset.
Example: Relay 1 is programmed for automatic reset only.
Relays 2, 3, and 4 are programmed for aut manual reset.
16
1
2
3
4
www.predig.com
