Functional Tests And Adjustments; Introduction; Bump Testing Vs . Adjusting Detector Response - Emerson MRLDS-250 Installation And Operation Manual

6 Functional Tests
and Adjustments

6.1. Introduction

To comply with the requirements of EN378 and
the European F-GAS regulation, gas detectors must
be tested annually. However, local regulations may
specify the nature and frequency of this test.
CAUTION: Check local regulations on
calibration or testing requirements.
CAUTION: The MRLDS-250 contains
sensitive electronic components that can be
easily damaged. Do not touch or disturb any of
these components.
CAUTION: Annual checks and adjustment
using calibration gas is recommended.
Calibration gas adjustment frequency may be
extended based on application, but should
never exceed a time period of two years.
WARNING: In applications where life safety is
critical, calibration gas adjustment should be
completed quarterly (every three months) or on
a more frequent basis. Emerson Retail
Solutions is not responsible for setting safety practices
and policies. Safe work procedures including
calibration policies are best determined by company
policy, industry standards, and local codes.
WARNING: Failure to test or adjust the unit in
accordance with applicable instructions and
with industry guidelines may result in serious
injury or death. The manufacturer is not liable
for any loss, injury, or damage arising from improper
testing, incorrect adjustment, or inappropriate use of
the unit.
16 • MRLDS-250 Gas Detector Manual
CAUTION: Before testing the gas detectors
on-site, the MRLDS-250 must be powered up
and allowed to stabilize.
CAUTION: After initial installation, the
MRLDS-250 should be gas tested to ensure
proper operation.
CAUTION: The testing and/or adjustment of
the unit must be carried out by a suitably
qualified technician, and must be completed:
• In accordance with this manual.
• In compliance with locally applicable guide
lines and regulations.
Suitably qualified operators of the unit should be aware
of the regulations and standards set down by the
industry/country for the testing or calibration of this
unit. This manual is only intended as a guide and,
insofar as permitted by law, Emerson Retail Solutions
accepts no responsibility for the calibration, testing, or
operation of this unit.
The frequency and nature of testing or calibration may
be determined by local regulation or standards.
EN378 and the F-GAS Regulation require an annual
check in accordance with the manufacturer's
recommendation.
6.2. Bump Testing vs.
Adjusting Detector
Response
There are two concepts that need to be
differentiated:
1. Bump test
2. Gas detector response adjustment
Bump Test:
A bump test exposes the gas detector to a gas. The
operator then observes the gas detector's response to
the gas. The objectives are two-fold:
• Establishes if the gas detector is reacting to the gas.
• Determines if all of the detector outputs are working
026-1315 Rev 2 11-APR-2017