PEMTECH PT2008 Series User manual

Model PT2008
Multi-channel Gas
Monitor / Controller
Revision 2.0
March 2012
Operator’s
Manual
Pem-Tech, Inc.
Houston, Texas
U.S.A
www.pem-tech.com
Gas Detection Technology

PT2008 Gas Monitor / Controller Rev 2.0 Page 2
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.

PT2008 Gas Monitor / Controller Rev 2.0 Page 3
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.

PT2008 Gas Monitor / Controller Rev 2.0 Page 4
TABLE OF CONTENTS
1.0 Overview 5
1.1 Data Display 6
1.2 Front Panel 6
1.2.1 Keypad Switches 6
1.3 Specifications 7
1.3.1 DC Power Supply 7
1.3.2 130 Watt AC-DC Power Supply 7
1.3.3 Relays 7
2.0 Installation and Startup 9
2.1 DC Power Input 10
2.2 Connecting Sensor to Monitor 10
2.3 Connection Board 11
2.4 Alarm Wiring Diagram 12
2.5 Wiring to Alarm Station 13
2.5.1 Wiring Diagram 15
3.0 Startup 16
3.1 Apply Power 16
3.2 Normal Operation and Alarms 17
3.2.1 Normal Operation 17
3.2.2 Alarms 17
3.2.3 Alarm Reset 17
3.2.4 Alarm Bypass & Acknowledge 17
4.0 Edit Configurations 18
4.1. Channel Configuration 18
4.1.1 Change sensor Type 18
4.1.2 Edit Alarm Levels 19
4.1.3 Edit Alarm Type 19
4.1.4 Relay Type 20
4.2 Program Sensor Location Tags 21
4.3 Setting MS-Windows for HyperTerminal 23
5.0 MODBUS Communication 24
Spare Parts List

PT2008 Gas Monitor / Controller Rev 2.0 Page 5
1.0 OVERVIEW
Model PT2008 series monitor & controller is designed to monitor and display data for up to 16
remote mounted sensors. The controller features large LCD display, 4 fully programmable alarm
relay contacts, and a sensor fault or malfunction relay. Also on the front panel are LEDs for visual
alarm indicators. Also on board is an RS232 port to program the sensor location tags and an
RS485 port to send data to PLC’s and DCS’s using MODBUS® RTU Communication protocol.
Figure 1. Model PT2008 Controller, Front view
MULTICHANNEL CONTROLLER
MODEL PT2008
ACK.RESET PRGM. ENTER
WARN
ALARM
FAIL
HINGED DOOR WITH CLEAR VIEWING WINDOW - NOT SHOWN
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PT2008 Gas Monitor / Controller Rev 2.0 Page 6
1.1 DATA DISPLAY
PT2008 Controller displays location tags and the sensor readings. For controller
programmed for more than 8 channels, data is displayed eight channels at a time. Each
screen displays data for 10 seconds and then display switched for next 8 channels and so
on.
1.2 FRONT PANEL
On front panel are visual alarm indicators and keypad switches to program controller
configuration. Also RESET and ACK key switches are used to Reset and acknowledge any active
alarms.
1.2.1 KEYPAD SWITCHES
RESET: When pressed in normal mode it will Reset any currently active alarms.
ACK: Pressing the key will bypass or acknowledge active alarms for 30 minutes. If any
sensor is still in alarm state the alarm relays will be activated again.
PRGRM: Press this key to enter into controller configuration mode.
ENTER, UP & DOWN: These keys are used while editing controller configuration.

PT2008 Gas Monitor / Controller Rev 2.0 Page 7
1.3 SPECIFICATIONS
1.3.1 DC POWER SUPPLY REQUIREMENTS
The standard power requirement for PT2008 controller is 16-28 VDC @ 2 Watts maximum.
The DC power is connected to DC terminal on the main connection board. The DC power
supplied to this terminal is also routed to the DC power supplied to each of the connected
sensor thru a Fuse on the connection board.
The number of sensors connected to the controller increases the total power consumption
of the system. Typical power consumption of each sensor manufactured by Pem-Tech is
listed in table below:
Model #
Toxic
LEL
Combustibles
PT205 Series
45 mA @ 24VDC
(1.1 Watt)
58 mA @ 24VDC
(1.4 Watt)
PT295 Series
55 mA @ 24VDC
(1.3 Watt)
70 mA @ 24VDC
(1.7 Watt)
Ultra 1000 Series
90 mA @ 24VDC
(2.2 Watt)
110 mA @ 24VDC
(2.6 Watt)
1.3.2. 130 WATTS AC –DC POWER SUPPLY
An external AC to 24 VDC power supply is used to power the main controller and all the
sensors connected. The AC power input is universal 100 –240 VAC and auto switching.
Power Supply: 110-120 VAC @ 3.2 A Max.
220-240VAC @ 1.6A Max.
1.3.3 RELAYS
Provided on the connection board are four (4) programmable common alarm relays for
Alarm 1, 2, 3 & 4. Also a sensor fault or malfunction relay. All Relays are rated 5 Amps @
30VDC or 240 VAC

PT2008 Gas Monitor / Controller Rev 2.0 Page 8
1.3.4 ENCLOSURE
Nema 4X Wall mount Fiberglass enclosure.
Weight: 12 Lbs.
Dimension: 19”H x 12”W x 8.5”D
Nema 7 Wall mount explosion Proof enclosure with viewing window.
Weight: 118 Lbs
Dimension: 16”H x 16”W x 9”D
1.3.5. TEMPERATURE RANGE
-25 °C to 50 °C
1.3.5 VISAUL ALARM INDICATORS
Amber LED indicator on the front panel for Low / Warn alarm status
Red LED for High alarm status
Red LED for Sensor Fault / Malfunction

PT2008 Gas Monitor / Controller Rev 2.0 Page 9
2.0 INSTALLATION AND START UP
PT2008 series is a wall mount controller. The fiberglass version is rated Nema 4x
weatherproof and can be mounted outdoor. The explosion proof enclosure, Nema 7 is
suitable for use in hazardous locations. Refer to figure 2 for overall enclosure dimension
and mounting holes. The mounting feet for the fiberglass enclosure are provided
separately. The monitor should be installed approximately 5 feet above ground.
Extreme temperature condition must be avoided. Avoid installing the unit with the front
facing direct sunlight. An overhead weather deflecting shield is highly recommended.
Conduit entries or cable glands must be installed at the bottom of the enclosure by the
user.
Figure 2. Fiberglass enclosure, dimensional overview

PT2008 Gas Monitor / Controller Rev 2.0 Page 10
2.1 DC POWER INPUT
A terminal block is provided on the connection board for 24VDC power from an external
AC/DC power supply. Refer to figure 4 for DC connection to the controller.
Do not turn on the power until all sensors wires (if connected) are secure.
2.2 CONNECTING SENSORS TO THE MONITOR
Terminal contacts/blocks are provided on the connection board for the remote sensors.
The terminals are labeled as CH-1, CH-2 and so on. Furthermore, the each contact on the
terminal is labeled as +24, -24, E for SENSOR SUPPLY, SENSOR GND, and 4-20mA
Sensor Input. Sensors should be connected to the connection board by a 3 conductor
shielded cable. Simply remove or pull the screw terminal block from its header base,
connect the wires from the sensor and plug it back in. Be sure to check the wires
connecting the sensor and Channel Input terminal on the PT2008 connection board are as
shown in figure 3 below.
The Sensor Supply terminals are fused to prevent short circuit damage to the unit. ( Fuse
is rated 4Amps).
Figure 3. Wiring sensor to PT2008 connection board assembly.
Note: complete connection boards are not shown for clarity.
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