Bacharach 3015-4286 - Manual (Page 7)

Single Zone Gas Monitor
P/N: 3015-4256 Rev 13 3
1.5.8. Fusing
WARNING: This device uses type “F” fuses (F1 and F2) rated at 1.0 A, 250 VAC.
Replace ONLY with Bacharach-approved fuses.
1.5.9. Installation Category
IMPORTANT: This device is classified as Installation Category II, Pollution Degree II, as
defined by UL.
1.5.10. Altitude Limit
IMPORTANT: This device is designed for operation at or below an altitude of 6,562 ft
(2,000 m). Do not operate this device above this altitude limit.
1.5.11. Cleaning
NOTE: To clean the outside of the case use a dry cloth. To avoid shock hazard and/or
equipment damage, DO NOT use soap and water.
1.6. Functional Overview
1.6.1. General Description and Use
Single zone gas monitors are specified to support compliance to federal, state and local safety codes
governing gas emissions. Avoiding significant loss reduces equipment replacement costs, maintains
equipment efficiency, promotes safety, and protects the environment.
The Bacharach SZ is designed to continuously test for the presence of gas in an area that is located up to
500 ft (152.4 m) away from the monitor. The SZ monitor displays the type of gas being monitored, along
with displaying both the current gas level and the peak gas level detected in that area on its front panel
LCD. The monitor retains a log of previous readings that can be easily accessed for analysis.
An audible alarm and front panel indicators are provided to signal alarm and fault conditions, and relay
contacts are provided that can be used to trigger external alarm devices in the event of a system fault, or
if a leak (small), spill (medium), or evacuation (large) level of gas is detected. The system also includes a
4
−20 mA current loop interface that can be connected to remote monitoring equipment.
The SZ requires only minor periodic maintenance such as the occasional replacement of filters. The
monitor incorporates active diagnostics that continuously check the system for proper operation. A front
panel indicator is provided to alert an operator of system malfunctions, and fault codes are generated that
enable the operator to identify the cause of the fault.
1.6.2. Understanding Monitoring Levels
Effective use of this monitor requires an understanding of what constitutes reasonable alarm set points for
the type of gas being monitored. Most systems leak some gas. In a good “tight” installation these
background levels will be acceptably low and often do not require corrective action. You can reduce
nuisance alarms and needless service calls if the alarm levels are set at practical limits. Bacharach has
developed recommended monitoring levels based on compliance to ANSI/BSR ASHRAE 15-2007 and
ASHRAE Safety Code 34-2007. These reference levels are listed in the Appendix.