ENMET DC User Manual

ENMETENMET Corporation

PO Box 979
Ann Arbor, MI 48106-0979

Instruction Manual
Gas Sampling Unit

DC Operation

80003-141
February 1999
MCN-248, 01/22/01
MCN-291, 10/21/03

Table of Contents

1.0 INTRODUCTION ...................................................................................................................................................................................1

1.1 UNPACK .................................................................................................................................................................................................. 1

1.2 CHECK ORDER ....................................................................................................................................................................................... 1

1.3 SERIAL NUMBERS..................................................................................................................................................................................1

2.0 SPECIFICATIONS ................................................................................................................................................................................2

3.0 FEATURES AND FUNCTION...........................................................................................................................................................2

4.0 INSTALLATION....................................................................................................................................................................................4

5.0 OPERATION...........................................................................................................................................................................................7

5.1 PROCEDURE FOR SAMPLING FROM GAS BAG.................................................................................................................................... 7

6.0 MAINTENANCE.....................................................................................................................................................................................9

6.1 PUMP MAINTENANCE FOR PUMP 04018-018.....................................................................................................................................9

6.2 PUMP MAINTENANCE FOR PUMP 04018-118...................................................................................................................................11

6.2.1 Pump Diaphragm Replacement...............................................................................................................................................11

6.2.2 Check Valve Housing Replacement.........................................................................................................................................12

7.0 WARRANTY ..........................................................................................................................................................................................13

List of Illustrations

FIGURE 1: GAS SAMPLING UNIT FEATURES .............................................................................................................................................3

FIGURE 2: DIMENSIONAL DIAGRAM ..........................................................................................................................................................4

FIGURE 3: GAS SAMPLING UNIT WITH SENSOR/TRANSMITTER MOUNTED INTERNALLY ..............................................................4

FIGURE 4: APPLICATION, REMOTE SENSOR, MOTORIZED SAMPLE DRAW SYSTEM ......................................................................5

FIGURE 5: WIRING DIAGRAM GAS SAMPLING UNIT WITH RX-1G CONTROL.................................................................................6

FIGURE 6: FILLING SAMPLE BAG FROM GAS CYLINDER ......................................................................................................................7

FIGURE 7: VENTING CALIBRATION GAS TO A GAS BAG........................................................................................................................ 8

FIGURE 8: VENTING CALIBRATION GAS TO AN EXHAUST LINE...........................................................................................................8

FIGURE 9: 04018-018 PUMP FEATURES .....................................................................................................................................................9

FIGURE 10: 04018-118 PUMP FEATURES................................................................................................................................................. 11

FIGURE 11: DIAPHRAGM DETAILS............................................................................................................................................................ 11

FIGURE 12: CHECK VALVE H OUSING REPLACEMENT DETAILS........................................................................................................ 12

FIGURE 13: PROPER ORIENTATION OF CHECK VALVE HOUSING AND GASKET............................................................................ 12

Reference information:

NOTE: [important information about use of instrument – if not followed may have to redo some steps.]

CAUTION: [affects equipment – if not followed may cause damage to instrument, sensor etc…]

WARNING: [affects personnel safety – if not followed may cause bodily injury or death.]

Gas Sampling Unit ENMET Corporation

1.0 Introduction1.0 Introduction

The ENMET gas sampling unit is used in applications requiring air sample draw to a sensor. It is designed to be used
in conjunction with ENMET sensor/transmitters. If used with other manufactures’ sensor/transmitters, contact your
local ENMET representative or ENMET

NOTE: All specifications stated in this manual may change without notice.

1.1 Unpack

Unpack the Gas Sampling Unit and examine it for shipping damage. If such damage is observed, notify both ENMET
customer service personnel and the commercial carrier involved immediately.

Regarding Damaged Shipments

NOTE: It is your responsibility to follow these instructions. If they are not followed, the carrier will

not honor any claims for damage.

q This shipment was carefully inspected, verified and properly packaged at our company and delivered to the

carrier in good condition.

q When it was picked up by the carrier at ENMET, it legally became your company’s property.
q If your shipment arrives damaged:

• Keep the items, packing material, and carton “As Is.” Within 5 days of receipt, notify the carrier’s local

office and request immediate inspection of the carton and the contents.

• After the inspection and after you have received written acknowledgment of the damage from the carrier,

contact ENMET Customer Service for return authorization and further instructions. Have your Purchase
Order and Sales Order numbers available.

q ENMET either repairs or replaces damaged equipment and invoices the carrier to the extent of the liability

coverage, usually $100.00. Repair or replacement charges above that value are your company’s responsibility.

q The shipping company may offer optional insurance coverage. ENMET only insures shipments with the

shipping company when asked to do so in writing by our customer. If you need your shipments insured, please
forward a written request to ENMET Customer Service.

Regarding Shortages

If there are any shortages or questions regarding this shipment, please notify ENMET Customer Service within 5 days
of receipt at the following address:

ENMET Corporation

680 Fairfield Court

Ann Arbor, MI 48108

734-761-1270 734-761-3220 Fax

1.2 Check Order

Check, against the purchase order. Verify that the Gas Sampling Unit is received as ordered. If there are accessories
on the order, ascertain that they are present. Notify ENMET customer service personnel of any discrepancy
immediately.

1.3 Serial Numbers

Each Gas Sampling Unit is serialized. These numbers are on tags on the equipment and are on record in an ENMET
database.

1

ENMET Corporation Gas Sampling Unit

2.0 Specifications2.0 Specifications

Power Requirement 10 - 30 V DC
Suction Flow Rate 0.3 Liter/min. (adjustable after installation)
Sampling distance 100 ft maximum
Suction Pump Electromagnetic diaphragm pump
Piping Material Polypropylene, non toxic vinyl tubing
External Piping Connections Compress fitting for ¼ O.D. tubing
Installation Method Wall mounting
Dimensions 11(w) X 6.5(H) X 5(D) inches
Weight 2 lbs
Operating Temperature Range +32ºF (0 ºC) to +104ºF (40ºC)

NOTE: All specifications stated in this manual may change without notice.

3.0 Features and Function3.0 Features and Function

Refer to Figure 1 for component layout diagram.

Feature Function

Power Terminal This terminal connects the DC power (10 - 30 VDC)

Flowmeter This Flowmeter allows the user to verify and monitor the

Flowmeter Valve This valve is used to control the flow rate. Adjust flow to

Flow Sensing Device This flow sensing device is to monitor for loss of air flow.

Low Flow Alarm Light (Optional
with some installations)

Sampling Pump This electromagnetic diaphragm pump draws the air

Exhaust Outlet This port expels the air sample after it passes the sensor.

Sampling Inlet This port draws the air sample from the test area. For

supplied from external power source

flow rate of the air sample. Proper flow rate,
approximately 0.5 lpm(liter per minute).

proper flow rate, approximately 0.5 lpm (liter per minute).

Activation upon loss of air flow results in relay activation.
This light when green indicates flow rate is sufficient.

When light is red, flow rate is inadequate.

sample from the test area to the sensor.

For external piping, use ¼″ O.D. tubing.

external piping, use ¼″ O.D. tubing.

Gas Sensing Chamber This chamber directs the air sample to the gas sensor.

Varies, depending on type of sensor/transmitter

2

Gas Sampling Unit ENMET Corporation

Enclosure

Flowmeter

Power

10 – 30 VDC

Sensor

10 – 30 VDC

Terminals

Valve

Flowmeter

Sample Pump

Chamber

NEMA-4X

(Optional)

Flow Sensor

Internal View

Sample Inlet

Exhaust Outlet

External View

Figure 1: Gas Sampling Unit Features

3