Bacharach H-SEM Instruction - page 16
Operation
H-SEM
12
Instruction 3015-4584
3.9 Clearing the PPM Log & Faults Log
Up to 200 gas measurements, and 30 fault events are stored by the monitor.
To clear stored data, first display the data to be cleared by selecting the PPM LOG or FAULTS function
(Pages 8 &
1
9). Next, press both the ENTER and Keypad Right buttons at the same time. A single, long
tone should be heard when the data has been successfully cleared.
3.10 Working with the DIAG Function
3.10.1 Overview
The DIAG function displays sensor data and status information useful to a service technician for
troubleshooting various fault conditions. Explanations of the data shown in these screens are given below.
3.10.2 Keypad Functions
From the Data Display screen, press boththe Keypad Left and Right buttons at the same time to
display the first Function Menu screen. Next, use the Keypad buttons to move the arrow (>) until it is
next to the DIAG function, and then press ENTER to display the first of two Diagnostic screens.
Press the Keypad Up button to toggle between the First and Second Diagnostic screen.
3.10.3 First Diagnostic Screen
In the First Diagnostic screen, the user can toggle between displaying Bench Voltage / Detector
Temperature, and Noise / Box Temperature by pressing the Keypad Right button.
Bench Voltage – This is the current peak-to-peak output of the IR detector. In the absence of gas this
value can range from 3.90000V to 4.50000V.
Noise –The Noise value is a 16 point running average of the noise portion of the IR detector’s output. This
reading is valuable mainly when gas is NOT present.
Detector Temperature – This is the current detector temperature in °C.
Box Temperature – This is the current internal enclosure temperature in °C.
Fault Code – Current fault code. A value of <0000> indicates that no faults are being detected.
Pressure Reading – This is the pressure as measured every purge cycle with the sample pump off and
the gas-sample inlet open. Its value is weather and altitude dependent and can range from 10.0 to
15.5 PSIA.
Purge Valve Asterisk (∗) – The purge valve can be opened and closed by pressing the Keypad Left
button. An asterisk appears on the display when the purge valve is open causing the monitor to draw air
from the purge-air bag.
4.20885v <0000>
29.05cD 14.58psi
Bench Voltage
Fault Code
Detector Temperature °C
∗ Pressure Reading
0.00075n <0000>
35.40cB 14.59psi
Noise
Fault Code
Box Temperature °C
∗ Pressure
Reading