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H25-IR Preparing for Operation
Instruction 3015-4342 13
2.4.3 Relays
Four SPDT relays (rated 3 A, 240 VAC) can be individually programmed to energize under any one of 11
different operating conditions. The contacts of these relays can be connected to an external device that will
activate when the designated operating condition is met. Refer to Section
2.7 External Relay Connections.
Use the Up and Down buttons to highlight the relay to be programmed. Press ENT to make the selection
and display that relay’s assignment screen.
Use the Up and Down buttons to highlight the desired operating condition for the selected relay. Press
ENT to save the selection.
NOTE: SETPOINT is the gas value as entered per Section “
2.5.5 Setpoint.”
LOG LIMIT is the total accumulated leak value as entered per Section “4.2.10.4 Setting the Log Limit.”
For example: If Relay 1 is programmed to “CLOSE AT LOG LIMIT,” its N.O. contacts can be connected to
an external alarm device (e.g. strobe light or buzzer) that will activate when the total accumulated leak
value in the data log has reached its programmed limit.
TIP: When measuring the total leak-rate of a system, it’s important to clear the log per Section “
4.2.10.2
Clearing the Log” before starting a new series of leak-rate measurements.
2.4.4 4–20 mA Loop
Selecting the 4–20 mA LOOP function allows the current loop factor to be changed from its factory default
of 0.016 ppm (corresponds to 0.016 mA per ppm), which provides an output range of 0 ppm (4 mA) to
1,000 ppm (20 mA). Refer to Equation 3.1.
Use the Left and Right buttons to move the blinking cursor across the screen to highlight the digit to be
modified, and then use the Up and Down buttons to modify that digit. Press ENT to save the new loop factor.
Loop Output in mA = (Loop Factor x ppm) + 4 mA Eq. 3.1
To facilitate loop zero and span checking, note that when the Loop parameter is selected the loop output is
set to 20 mA, and upon exiting this parameter the loop output is set to 4 mA.
EDIT LOOP FACTOR
0.016ppm
1 = NOT USED
2 = NOT USED
3 = NOT USED
4 = NOT USED
RELAY 1 ASSIGNED TO
NOT USED
CLOSE >= SETPOINT
CLOSE < SETPOINT
CLOSE ON FAULT
CLOSE DURING CAL
CLOSE IN MEASURE
CLOSE AT LOG LIMIT
CLOSE IN SETUP 1
CLOSE IN SETUP 2
CLOSE IN SETUP 3
CLOSE IN SETUP 4