Preparing for Operation
H25-IR
14
Instruction 3015-5286
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
TIP:
The loop output can be checked per Section 5.1.5 Loop Test.
2.4.5 Brightness
The BRIGHTNESS function changes the brightness level of the instrument’s front panel display.
Use the
Up
,
Down
,
Left
, or
Right
button to change the brightness to any one of four levels. Press
ENT
to save
the selected brightness level.
2.4.6 Clock
The CLOCK function sets the instrument’s date (MM/DD/YY) and time (24 hour format, where 1:00 PM is
displayed as 13:00). The clock allows measured values to be logged with a date/time stamp (refer to
Section
4.2.9 Logging Measured Readings
).
Use the
Left
and
Right
buttons to move the blinking cursor across the screen to highlight the digits to be
modified, and then use the
Up
and
Down
buttons to modify those digits. Press
ENT
to save the new date and
time values.
2.4.7 PCHK Mode
The PCHK Mode setting determines when the instrument performs an ambient pressure check as follows:
AUTO
– A pressure check is performed once every 60 minutes.
AT CAL
– A pressure check is performed at the end of every calibration.
Note that a pressure check is always performed when the instrument is first turned ON just before the warm-up
period begins, regardless of the PCHK Mode setting.
Use the
Up
and
Down
buttons to highlight the desired setting. Press
ENT
to save the selection.
EDIT LOOP FACTOR
0
.016ppm
BRIGHTNESS
PRESS ARROW KEYS TO
ADJUST
SET DATE & TIME
07
/16/04 13:13
PCHK MODE
AUTO
AT
CAL
Summary of Contents for H25-IR
Page 6: ...Contents H25 IR iv Instruction 3015 5286 Notes ...
Page 26: ...Preparing for Operation H25 IR 20 Instruction 3015 5286 Notes ...
Page 34: ...Calibration H25 IR 28 Instruction 3015 5286 Notes ...
Page 43: ...H25 IR Operation Instruction 3015 5286 37 Notes ...
Page 68: ...Specifications H25 IR 62 Instruction 3015 5286 Notes ...
