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

























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.












PT2008 Gas Monitor / Controller Rev 2.0 Page 11
2.3 CONNECTION BOARD ASSEMBLY
To access the connection board loosen the 2 panel screws on right side of the front panel.
This will allow the hinged front panel to swing out. All cables must be brought in thru the
cable glands on the bottom of the enclosure. The user must install the cable glands.
Depending the controllers maximum input channel capacity the connection board either
have 8 or 16 sensor / channel connections.
Figure 4. PT2008 Connection board assembly , layout diagram. Connection board
shown is for 16 channels / sensors.
RS232
Fuse
4 A


+24
-24
mA
RF Module - RF Coaxial
Connection - If Used / Equiped















PT2008 Gas Monitor / Controller Rev 2.0 Page 12
2.4 Alarm Wiring diagram
Following is a typical wiring diagram for connecting alarm devices to relay contacts. Note
that contacts are dry or potential free contacts. Refer to the wiring details provided by the
manufacturer of alarm devices.
Figure 5 below is a sample wiring connection for an alarm. The relay contacts are form
“C” type contacts. Refer to section on monitor configuration for setting the alarm levels.
Other alarm devices are also connected in similar manner as one shown below.
Figure 5. Typical Alarm Wiring diagram
NO
-V
+V
COM
Typical Load
+LIGHT
Screw Terminal Plug-in Blocks Not Shown for Simplicity
Load: 5 A Resistive Maximum
RLY-x
One of Six Relay Outputs Typical Example
MALF (FAULT) Relay Wired In Same Manner
2/C



PT2008 Gas Monitor / Controller Rev 2.0 Page 13
2.5 Wiring to Alarm Station
Figure 6 shows a sample wiring diagram to connect PT2008 alarm relays to an Alarm
Station. Typical alarm station consists of 2 distinct color strobe light and a buzzer or siren.
The color of strobe light visually distinguishes between the low toxic and combustible gas
alarm. The buzzer or horn is for high alarm for either toxic or combustible. On PT2008
connection board three relays are configured in order to have distinct low alarm for toxic
and LEL combustible and a common high alarm (siren) for both toxic and combustible.
Alarm relay 1 is wired for Low toxic gas alarm, alarm relay 2 for low combustible alarm
and alarm relay 3 for common high alarm. To achieve this alarm relays on the gas monitor
must be configured as follows.
Assume the toxic and LEL alarm levels are as listed in table below
Sample alarm levels / set-points
Sensor
Type
Low Alarm
High Alarm
Toxic
10
15
LEL
20
40
Using the “Channel Configuration” option (see section 4.0) configure the alarm levels for
each relay as follows:
Notice that alarm relay 4 is not used here. Setting level to 00 is therefore, disabling the
alarm relay 4.
Toxic Sensors
Relay #
Alarm Level
1
10
2
00
3
15
4
00
Combustible (LEL)
Sensors
Relay #
Alarm Level
1
00
2
20
3
40
4
00

PT2008 Gas Monitor / Controller Rev 2.0 Page 14
Given above alarm level and relay configuration and wiring to alarm station as shown in
figure 6 the audio and visual alarm devices are activated as outlined in the table below.
Sensor
Gas Reading
Relay #
Activated
Strobe / Horn
Toxic
(H2S, CO, NO,
NO2, SO2,
Etc. )
Greater than or Equal to 10
But
Less than 15
1
Amber Strobe
Greater than or equal to 15
1 & 3
Amber Strobe
& Horn
Sensor
Gas Reading
Relay #
Activated
Strobe / Horn
LEL
Combustible
Greater than or Equal to 20
But
Less than 40
2
Red Strobe
Greater than or equal to 40
2 & 3
Red Strobe
& Horn

PT2008 Gas Monitor / Controller Rev 2.0 Page 15
2.5.1. Wiring Diagram
Figure 6. Wiring PT2008 to Alarm Station

PT2008 Gas Monitor / Controller Rev 2.0 Page 16
3.0 Start Up
Complete the following procedures for the normal unit operation.
1. Complete the mounting and wiring procedures described in earlier sections.
2. Follow gas sensor & transmitter operation manual for proper wiring of sensors with
the monitor.
3. Verify all the wiring connections to be correct and secure.
3.1 Apply Power
Apply power to the monitor and verify following conditions.
1. LCD should display startup messages for few seconds and then go into normal
operation mode by displaying sensor readings. Since monitor supplies the DC power
to the sensors, therefore, a short time is allowed for the sensors to stabilize.
2. Verify that the channel configuration and the sensor connected to that channel input
are the same.
3. Verify and change alarm set points according to your specifications.
Note: To verify or change alarms or channel configuration refer to monitor
configuration section.

PT2008 Gas Monitor / Controller Rev 2.0 Page 17
3.2 NORMAL OPERATION AND ALARMS
3.2.1 Normal Operation
During normal operation the monitor will display the channel number or sensor location
tags with current sensor readings. The controller continuously monitors all sensors that
are connected. However, it will display 8 channels at a time. Once properly configured
and if all the sensor readings are below alarm level then all the alarm relays and the visual
alarm LED indicators on the front panel should be off.
3.2.2 Alarms
PT2008 monitor is equipped with four (4) alarm relay contacts. The monitor activates the
alarm relays when any of the sensors exceeds the programmed alarm set point. Also LEDs
on the front panel will also light up for visual alarm indication.
Standard alarm set points are programmed at the factory before shipment. The user must
verify the alarm set points and make changes if desired. Refer to section on Programming
Alarm Set points.
3.2.3 Alarm Reset
Once the gas concentration has dropped below the alarm setpoint the relay will deactivate
itself. However, this is true only if the relay is configured as non-latching (NL). If the relay
is configured latching then it must be deactivated manually. To deactivate the latching
alarm simply press and hold RESET switch on the front panel for few seconds. The
monitor will deactivate the relays and visual LED indicators and will display ***** RESET
**** message on the LCD for few seconds.
Note: If the gas concentration continues to be higher than the programmed alarm set point the
alarm will be activated again.
3.2.4 Alarm Bypass or Acknowledge
In the Alarm Acknowledge mode the monitor will not activate the alarm relays if any of
the sensor reading exceeds the programmed alarm level. Press and hold the ACK key
until the Acknowledge message is displayed on the LCD. The displayed message will
indicate the alarm bypass time. This bypass time period is programmed at the factory.
Once the Alarm Bypass time has expired the relays will be activated if the concentration
on the sensor exceeds the programmed alarm level. To terminate the alarm bypass mode
simply press the RESET switch until the monitor displays the RESET message on the LCD.

PT2008 Gas Monitor / Controller Rev 2.0 Page 18
4.0 EDIT CONFIGURATION
Press the PRGRM key on the front panel to enter the controller configuration mode. The
short menu is displayed as follows:
Use the UP / DOWN arrow keys to select the option. When the desired option is
underlined press the ENTER key to select.
4.1 CHANNEL / SENSOR CONFIGURATION
This option allows the user to change the configuration of each channel. Each
configuration data item consist of sensor type, (H2S, LEL, CO, OXYgen, etc ), the alarm
level and the alarm relay type (Latching or Non-Latching). The channel edit screen is
displayed as follows:
The edit screen allows the user to change the sensor type, the alarm levels and alarms as
latching or non-latching. The data item to be edited must be pointed by an arrow in front
of it. Edit the data by using the ENTER, Up & Down arrow keys on the keypad.
Edit Configuration
Channel Configuration
Relays Type
Sensor Location Tags
Exit
CH1 Location # 1
Sensor Type: H2S
Alarm # Level Latching
1 10 NO
2 15 NO
3 20 Yes
4 00 NO
Sensor Location / Tag
Sensor Type
Relay Latching
Yes/NO
Channel #
Alarm #
Alarm Level

PT2008 Gas Monitor / Controller Rev 2.0 Page 19
4.1.1. Change Sensor Type
When the arrow is pointing to the sensor type field press the UP or Down arrow
key to select different types of sensor connected to that input channel.
Press and hold the arrow key until the desired sensor type is displayed. Sensor
type is selected from the list of following
H2S - Hydrogen Sulfide
LEL - Combustible Hydrocarbon
CO - Carbon Monoxide
Oxy - Oxygen Deficiency
NOx - Nitric Oxide
NO2 - Nitrogen Dioxide
HCL - Hydrogen Chloride
CL2 - Chlorine
N/A - Disable Channel Input
Press the ENTER key once sensor type is selected.
4.1.2. EDIT ALARM LEVEL / SET POINTS
When the sensor type has been selected and ENTER key is pressed the arrow will jump to
point the Alarm 1 Level. Once again use the UP, Down and Enter key to modify.
When arrow is pointing to Alarm 1 - Level, press the Up arrow key to increase and
Down arrow key to decrease the alarm level.
The alarm levels can be set between 0 and the full scale range of the selected sensor
type. For example the full scale range of H2S and LEL type sensor is 100. The
alarm level can therefore, be set anywhere between 0 and 100. If the alarm is set to 00
then it is disabled only for that particular channel / sensor. Thus Alarm level can, therefore,
be set to 00 to disable for that channel.
When the desired alarm level is set press the ENTER key and the arrow will jump
to next alarm level.
Set all four (4) alarm level.
4.1.3. EDIT ALARM TYPE (Latching / Non-Latching )
When Alarm level 4 has been edited and Enter key is pressed the arrow will jump to
Alarm 1 - Type: Latching or non-latching.
Press the Enter key to toggle between Yes and NO. Select Yes if alarm to be
latching, select NO otherwise.
Press Down key to jump to next alarm type.

PT2008 Gas Monitor / Controller Rev 2.0 Page 20
Configure all four alarm types. Pressing the ENTER key on the fourth alarm type
will set the arrow back to the sensor type option.
When the configuration data for channel 1 is completed press the RESET key to jump
to configure channel 2. Configure all the channels.
Once all channels have been configured PT2008 will save the configuration into a non-
volatile memory and will display the message when finished.
After saving configuration data the main menu is displayed for further configuration
changes.
Note:
If an alarm is configured as Latching alarm, and once activated it can only be deactivated by
pressing the RESET switch. Non-Latching alarms are, however, deactivated when the
concentration goes below the alarm set point for that channel.
4.1.4 RELAY TYPE
This option is used to configure the alarm relays as normally energized or de-
energized. Following edit screen is displayed
Use the UP and DOWN arrow key move the arrow and point to data field. Then
press the ENTER key toggle between Yes and NO. Selecting Yes will enable the
relay to be active in no-alarm mode. And deactivate when the sensor reading
exceeds programmed alarm level.
Press the RESET key to save the data and return to main menu screen.
Configure Relay Type
Relay # Normally Energized
1 NO
2 NO
3 NO
4 YES