Ma Loop; Brightness; Clock; Pchk Mode - Bacharach H25-IR Operation & Maintenance Manual

Preparing for Operation
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
EDIT LOOP FACTOR
0.016ppm
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
TIP: The loop output can be checked per Section 5.1.5 Loop Test.

2.4.5 Brightness

BRIGHTNESS
PRESS ARROW KEYS TO
ADJUST
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

SET DATE & TIME
07/16/04 13:13
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

PCHK MODE AUTO
AT CAL
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.
14
Eq. 3.1
Instruction 3015-5286
H25-IR