HANLA
IMS
CO., LTD.
1610-5 SONGJEONG-DONG GANGSEO-GU BUSAN KOREA
-Tel: 82-51-601-3000
-Fax: 82-51-831-1850
-Email: [email protected]
MT-HGS-100NEW SYSTEM
Rev.9
2010-07-13
Page 10/58
1.4. Technical Data for Each Component
1.4.1. ANALYZING UNIT
A cabinet named "Analyzing Unit" includes the suction process, sampling gas detector(s) and pneumatic components
for up to 48 channels.
After suction sampling of a channel, an instrument air purge is started, in order to correct or prevent ingress of water,
moisture, condensation, dust or foreign bodies. The picture of analyzing board is following:
In case of several sampling gas detectors, the sampled gas passes through each detector one after the other, so that all
gas concentrations are measured at the same time. An additional Gas detector can easily be installed further. Each Gas
detector can be enabled or disabled at will.
1.4.2. A/D Conversion and Alarm
An electronic module supervises over the suction process, provides up to 8 analog inputs for gas detectors and flow
sensor placed either in BALLAST TANK suction process sampling(2 channels) or in PUMP ROOM suction process
sampling(4 channels). The local gas detectors are classed as additional individual channels as well as additional gas
detectors by using remained 2 channels of AD converter. The analog signal processing by the differential amplification
allows the high impedance and rejection of common-mode noise. To convert the current 4~20 mA to the voltage, the
load resistor 200[
Ω
] is used
That module periodically performs and saves all gas measurements. It provides a non-volatile memory for saving all
data, alarm status and operating parameters.
The Analyzing Unit provides two high or low gas concentration alarm levels on each channel and each gas (see7.4.2),
monitoring a permanent "Gas alarm" dry contact output (see 6.2):
z
pre-alarm limit, to advise that a gas concentration approaches the alarm unit;
z
alarm limit, with activation of another dry contact output dedicated to a horn/rotating lamp, until alarm
acknowledgement..
When some gas are without interest for some channels, the relevant alarm limits can be set at the extremities of the gas
range, in order to avoid gas concentration alarm monitoring for that gas on these channels.
The Analyzing Unit provides self-tests : sample flow, internal gas concentration, internal leakproof, detector's current
output, calibration gas flow, communication between Analyzing and Control Units, power supply. These tests monitor a
"System fault" and "Power supply" dry contact outputs.
1.4.3. Communication
This module also manages 4 digital RS485 communication ports(Generally, one for control unit. One for repeater SIL-
100. Then, only 2 ports are available for user interface. MODBUS RTU) and one RS232(for downloading or MODBUS
RTU) isolated communication port for connection to one or more remote Repeaters as described in synopsis, and/or an
external Monitoring System, using MODBUS RTU protocol. The Analyzing Unit operates as slave.
