PEMTECH PT920-16SS Manuale utente
MODEL PT920-16SS
16 CHANNEL
GAS MONITOR & CONTROLLER
Operator’s
Manual
Revision 2.0
May 2008
Pem-Tech, Inc.
Houston, Texas
U.S.A.
NOTICE
PEM-TECH INCORPORATED SHALL NOT BE LIABLE FOR
TECHNICAL OR EDITORIAL ERRORS OR OMISSIONS MADE
HEREIN, NOR FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES RESULTING FROM THE FURNISHING,
PERFORMANCE, OR USE OF THIS MATERIAL.
LIMITED WARRANTY
Pem-Tech, Incorporated warrants all the equipment to be free from defects in
workmanship and material. The products will operate in conformance with the
published specifications when subjected to intended and proper usage for the
period of one (1) year from the date of shipment.
The warranty provides only the benefits specified and does not cover defects
which result from acts beyond the control of PEM-TECH including, but not
limited to: damage by accident, negligence, tampering, or failure to operate in
accordance with the procedures outlined in the Operations Manual. PEM-
TECH’s liability under no circumstances will exceed replacement of the unit
claimed to be defective.
Tampering with the equipment and altering it for uses other than the intended
use or replacement of parts not supplied by the company, shall immediately
void and cancel all the warranties with respect to the affected products.
The warranties specified herein are in lieu of any and all other warranties,
express or implied. In no event, whether as a result of breach of warranty or
alleged negligence, shall PEM-TECH be liable for special or consequential
damages, including, but not limited to, loss of profits or revenue, loss of
equipment or down time costs.
2
SERVICE POLICY
Pem-Tech has service facility at the factory. For all the repairs contact at
our toll free number 1-800-379-3894 or visit our website www.pem-
tech.com
For all repairs call us for a Return Material Authorization number (RMA).
Inform us briefly the nature of the problem and obtain shipping address.
Properly pack the equipment before shipping. Also include your complete
shipping address and contact name and phone number.
For non-warranty repairs you must provide the limit to repair costs. State
if a quote for repair cost is required before you can authorize the repair
cost. For this an additional charge may be applicable.
NOTE:
1. For all the repairs under warranty, serial number must be legible on
the items being repaired.
2. Shipping point is FOB Houston.
3
TABLE OF CONTENTS
Specifications 5
Specifications for PT920-16 Rack assembly 5
Specifications for Model PT920 Series Control monitor 6
Overview 7
Programmable Relays 7
Figure 1. PT920 Control module Front Panel diagram 8
Installation and Startup 9
Figure 2. PT920-16SS Enclosure dimension 9
AC / DC Unit Power Up 10
Figure 3. System Overview drawing, 11
User termination, control modules in
Rack assembly
Connecting sensors to monitor 12
Connecting 4-20mA Gas Transmitter 12
Connecting Proximity Sensors 13
Figure 6. Typical sensor interface to Main connection 14
Board
Auxiliary 10-Amps alarm relay board assembly 15
Figure 7. Auxiliary alarm board interface to PT920 15
Figure 8. Jumper settings for Control Module type 16
Wiring Audio / Visual Alarms 17
Figure 9. Wiring diagram for Audio/Visual alarms 17
Startup 18
Apply Power 18
Setting Control module ID / Address 19
Normal Operation and alarms
Normal Operation 20
Alarms 21
Alarm Reset 21
Alarm Bypass 22
Programming Alarms 22
Programming Alarm Levels 23
Setting alarms as Latching or Non-Latching 24
Figure 10. PT920 Control Module diagram 25
Malfunction Condition 26
PartsList 27
4
SPECIFICATIONS
For PT920 Rack Assembly with Power Supply
MOUNTING: Wall or Panel Mount
ENCLOSURE: NEMA 4X Stainless Steel Enclosure with clear
window
DIMENSIONS: 19”H x 16”W x 8”D
WEIGHT: 45 Lbs.
OPERATING -40 °F to +170 °F. (-20 °C to +70 °C.)
TEMPERATURE
POWER INPUT: 110-220 VAC or 24 VDC
HUMIDITY: 0 to 100% non condensing
ALARM RELAYS 4 alarm relays. Form “C” type rated 10 Amps
1 relay for Hi-Hi and 1 for Malfunction each
rated 5 Amps
TERMINATIONS Terminal blocks for sensor and alarm
connections for wire size 16-22 AWG
ALARM RESET Master alarm Reset switch to Reset Alarms
SWITCH on all control modules
5
SPECIFICATIONS
For PT920 Control Module
Display Range: 0 to 99 for Toxic and Combustibles
0 to 25.0 % for Oxygen deficiency ( 3 Digit
Display)
Input Signal: 4-20mA ( for Gas Control Module)
Discrete ( For Status Input Module)
Relay Ratings: 4 each Form C type relay contacts
Rated 5 Amps each
Low, High, High-High, and Malfunction
Field programmable alarm levels, Latching or
non-latching, Normally open or Normally
Closed contact
Visual Indicators: 4 Bright LEDs on the front panel to indicate
alarm status. Amber LED for Low Alarm
Red LEDs for High and High-High and
Malfunction Alarm
Power Input: 24 VDC power input. Power is supplied
to remote sensor & transmitter through a 2
Amp miniature fuse
Power Consumption: < 1 Watt normal operation for each control
module. Max of 2.4 watt with all relays active.
Alarm Reset Pushbutton switch on front panel to Reset
Alarms
Alarm Bypass Toggle Switch to Bypass / Inhibit Alarm relays
6
OVERVIEW
Pem-Tech model PT920 is a microprocessor based single channel monitor
that utilizes the latest digital design techniques in instrumentation. The
monitor uses an 8-bit high speed RISC processor with a highly accurate
analog to digital logic. The controller module receives the signal from
remote gas transmitters and displays the gas concentration. The 24VDC
power to the control module is supplied by the common bus on the back
plane (main connection board). The power to the remote sensor connected
to the module is routed through a miniature fuse on the module.
Standard features are:
•Displays current gas concentration on two (2) Digit Bright LED
display ( 3 digits display for Oxygen deficiency )
•Low, High, & High-High fully programmable alarm relay contacts.
•Alarms programmable via switches on the front panel
•Sensor Malfunction relay contact.
•Visual alarm indicators on the front panel.
•Alarm RESET and BYPASS switch.
•Optional RS485 Serial Communication for Remote data display
•Master Alarm Reset on the main rack assembly to Reset Alarms.
Programmable Relays
Each control module can be programmed for 3 distinct alarm levels. The
alarm levels can be easily programmed using Pushbutton switch provided
on the front panel of the control module. The alarm relays on the main
connection board are configured to have discrete Low level gas alarm for
Toxic (H2S) and combustibles (LEL) gases. Also present on the main
connection board are common High and Hi-Hi alarm relay contacts.
Below each control module there is a 2-pin jumper to select the module for
Toxic or Combustible type. Proper selection of this jumper will enable the
module to properly activate the low level alarm relay.
Also present is a common Sensor Malfunction alarm relay.
All relays are Form “C” type. Low and High alarm relays are rated
10Amps each while Hi-Hi and Malfunction are rated 5 Amps each.
7
Figure 1: PT920 Series Control Module
8
MODEL PT 920
BYPASS
ALARMS
NORMAL
HOUSTON, TX
MALF
RESET
HIGH
HI−HI
LOW
LEDs FOR VISUAL
ALARM INDICATION
DIGITAL DISPLAY
THUMB SCREW
PUSHBUTTON SWITCH
FOR ALARM RESET
TOGGLE SWITCH FOR
ALARM BYPASS
MODULE HANDLE
INSTALLATION AND START UP
PT920 Enclosure must be installed in a safe area. Figure 2 shows the
mounting holes for the stainless steel enclsoure
Main control rack assembly can hold up to sixteen (16) PT920 series
control modules. On the front panel of each module a captive screw is
provided to secure the module to the rack. Do not use excessive force to
tighten the screw. Also a handle is provided to facilitate for insertion and
removal of the module from the rack assembly.
Figure 2. PT920-16 Stainless Steel Enclosure - Dimensions
9
AC / DC Power Up
AC Power Input
If an AC/DC Power supply is installed in the unit then
Din-Terminals are installed on the lower left corner of
the Main connection board for the main AC line input.
The connections on the Din-terminal blocks are labeled
L N G. Connect the external AC power to this
terminal.
DC Power Input
If the unit is DC powered the simply connect 24 VDC
supply to the 2 pin green terminal labeled DC-Iinput
on the main connection board.
Refer to figure 3 for the location of AC and DC terminals
10
Indice
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