PEMTECH PT295 Series Bedienungsanleitung

Model PT295

Stand Alone Toxic Sensor

Revision 5.1

Operator’s

Manual

Pem-Tech, Inc.

Houston, Texas

U.S.A

www.pem-tech.com

Gas Detection Technology

Table of Contents

Notice and limited Warranty 3

Service Policy 4

Specifications 6

Overview 7

Target gases and Detection Ranges 8

Transmitter Board assembly 9

Connection Board assembly 10

Wiring Diagram

DC Power and 4-20mA Signal Output 11

Low and High Alarms 12

Installation 13

Start Up 15

Normal Operation 16

Gas Reading Display 16

Signal Output 4-20mA 16

Alarm Conditions 17

Low & High Alarm, Fault 17

Resetting Alarms 18

Calibration 19

Sensor calibration 19

Recommended Calibration Gases 22

Calibration errors and remedies 25

Calibration Flow Chart 26

Adjust alarm set points 27

Setting Low & High Alarm Levels 27

MAINTENANCE

Factors affecting sensor accuracy 28

Routine maintenance 28

Sensor Inspection 28

Sensor Sensitivity 28

Sensor Replacement 29

Spare Parts 30

Part Numbers for transmitter boards 30

And sensor head assembly

Part Numbers for recommended calibration gases 31

PT295 Series Toxic Sensor Rev 5.1

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 equipment manufactured by it to be free from

defects in workmanship and material, provided that such equipment was properly

selected for the service intended, properly installed, and not misused. Equipment

received by Pem-Tech for warranty repair or replacement will be return-shipped at

the lowest transportation cost.

The warranty provided by Pem-Tech 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.

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 any

associated equipment; cost of capital; cost of substitute equipment, facilities or

services; down time costs; or claims of customers of the purchaser for such damages.

Please call factory for RMA (return merchandise authorization) number before sending any

equipment for repair or replacement.

PT295 Series Toxic Sensor Rev 5.1

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.

PT295 Series Toxic Sensor Rev 5.1

IMPORTANT

Be sure to read and understand this instruction manual before installing, operating

or servicing the gas detection equipment.

WARNING

•Do not open the sensor enclosure with power applied unless it is verified that no

combustible gases or vapors are present. Calibration or maintenance should not

be performed if there is any indication of the presence of combustible gas near

the sensor.

•If anytime an intrusive sensor calibration procedure has to be performed then de-

classify the area before opening the sensor junction box.

•The sintered flame arrestor on the stainless steel sensor head is an integral part of

the complete sensor assembly. Do not operate the gas sensor with the flame

arrestor removed or damaged.

CAUTION

•If needed the sensor threads should be coated with silicone free grease. The

junction box cover threads should also be lubricated .

Silicone based lubricants must never be used.

•Follow the wiring instruction for proper and safe operation under normal

conditions. Be sure that all wiring complies with NEC and all local ordinances.

PT295 Series Toxic Sensor Rev 5.1

SPECIFICATIONS

SENSOR TYPE Electrochemical Cell

WEIGHT 4 Lbs.

RANGE See Table I

TEMPERATURE RANGE: -4 °F to 122 °F ( -20 °C to 50 °C )

Or 20 °C to 65 °C intermittent

HUMIDITY: 0 to 95% RH, non-condensing

ACCURACY: ±5 % of full scale

REPEATABILITY: ±5 % of gas applied

RESPONSE TIME: With full scale gas applied:

90% full scale in < 30 seconds

CLASSIFICATION: CSA class I, Div. 1 & 2 Groups B,C, & D

CE0081 II 2 G Ex d IIC T6

Suitable for use in hazardous locations

POWER INPUT: 14 - 30 VDC ( 24VDC Nominal)

POWER CONSUMPTION: < 1.5 Watts

ANALOG OUTPUT 4-20mA DC linear.

Maximum of 300 Ohms loop resistance

DISPLAY 3 Digit LED display.

ALARM RELAY Form “C” type Alarm Relay contacts

Relay rating: 2 amps @ 30VDC or 125 VAC

Fully programmable,

Normally open or Normally closed,

PT295 Series Toxic Sensor Rev 5.1

Overview

Model PT295 is a single point fixed sensor for the detection of toxic gases in ambient

air. Table I lists the target gases and the detection ranges. PT295 displays the gas

concentration and transmits a linear 4-20mA analog output signal that is

proportional to the gas concentration displayed. The unit is also equipped with a

form “C” type alarm relay contacts.

The sensor also features a non-intrusive calibration. Calibration is performed by

activating an internal magnetic switch. All calibration and alarm configuration data

is maintained in a non-volatile memory

Sensor transmitter board and connection board are enclosed in an explosion proof

junction box (rated Class I, Div 1 & 2). The unit consists of three assemblies, the

transmitter and display board, the connection board, and the stainless steel sensor

head assembly. Each of these assemblies can be purchased separately.

Figure 1. Model PT295 Sensor

PT295 Series Toxic Sensor Rev 5.1

Target gases and detection Ranges

Table I

Target Gas Detection

Range

Hydrogen Sulfide (H

100 ppm

Carbon Monoxide (CO)

100 ppm

1000 ppm

Sulfur Dioxide (SO

)

50 ppm

Ammonia (NH

)

50 ppm

Nitrogen Dioxide (NO

)

20 ppm

Nitric Oxide (NO)

100 ppm

Hydrogen Chloride (HCL)

100 ppm

Chlorine (CL

)

10 ppm

Oxygen deficiency (O2)

25 %

Hydrogen (H

200 ppm

Methyl Mercaptan (CH

SH)

)

100 ppm

PT295 Series Toxic Sensor Rev 5.1

Transmitter Board

The transmitter board assembly consists of the signal conditioning circuit,

microprocessor, digital display and 4-20 mA output circuit. The transmitter board

assembly is connected to the connection board via ribbon cable and secured onto the

stand-off via two thumb screws. To remove the transmitter board simply move the

thumb screws counter-clockwise and slowly pull the transmitter board away.

Unplug the ribbon cable to completely remove the transmitter board from sensor

unit.

Note: Do not use force to tighten the thumb screws when installing the transmitter board

back on the connection / termination board.

Figure 2. Model PT295 Transmitter and connection board assembly

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PT295 Series Toxic Sensor Rev 5.1

Connection Board

The termination or connection board consists of alarm relay and DC-DC power

converters for the transmitter board and the sensor. The power converters are

protected against reverse polarity.

A 3 pin terminal is provided for user interface to the monitoring device for power

input and 4-20ma output. A three (3) Pin terminal block is also used for alarm

connections. Each pin on alarm terminal block is labeled as C (common), NC

(normally closed) and NO (normally open). See Figure 3.

The 4 pin terminal at the bottom of the board is labeled SENSOR. Four (4) wires

from the sensor head assembly are connected to this terminal.

These wires are connected as follows:

R Red wire (Sensor Positive 5 VDC Supply)

G Green Wire (Sensor Ground)

W White Wire (Sensor signal out) and

B Black wire (Sensor -5VDC Supply)

Note:

Oxygen sensor head has only 2 wires (Black and white). Thus only these 2 wire

connections are required

For proper operation these wires must be connected as noted above.

PT295 Series Toxic Sensor Rev 5.1

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