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

ENMET Corporation Gas Sampling Unit

210mm

4.0 Installation4.0 Installation

The Gas Sampling Unit needs to be level and as close to the area to be monitored as possible, to reduce transport time
to the sensor/transmitter.

• Refer to Figure 2 for mounting dimensional diagram.

• Sensor/Transmitters can be located within the Gas Sampling Unit or remotely. Refer to Figures 3,4 and 5

• Inlet tubing must be compatible with the target gas.

• Caution should be used to insure that fluids do not enter the inlet tubing.

• Some types of gases require that the sample gas be removed from the area. This is accomplished with the outlet

port. Figures 7 and 8 show typical use of gas bag and exhaust line from the outlet port.

• Power is supplied from an external source. Refer to Figures 4 and 5 for wiring diagram. Connect 10 – 30 VDC to

terminal block positions 1 and 3.

• After installing all the tubing and the sensor/transmitter, verify that there are no leaks in the system. Verification

should be done by plugging the inlet tube. If the system is correct the flow meter reads zero and the flow sensor
activates. If this does not happen, check all fittings and seals.

10.75″

273mm

.75″

19mm

8.28″

6.25″

159mm

4.87″

123mm

.75″

19mm

Figure 2: Dimensional Diagram

4.0″

101mm

6.75″

171mm

Figure 3: Gas Sampling Unit with Sensor/Transmitter mounted Internally

4

Gas Sampling Unit ENMET Corporation

110 V

Outlet

Clear Plastic

Sample from

12V

in

Sensor

tape to seal

DC

Terminal positions 1 & 3

Gas Sampling Unit

ISA-M

Tubing

Sensor Adapter

Remote Location

From: ISA-M terminal TB2-positions 7&8
To: Gas Sampling Unit terminal positions 1&3

use Teflon

Using 12 VDC source ISA-M

Cord or Conduit

AC

Line Cord

Sensor Wiring Enclosure

12 VDC Out TB2-

7: Positive
8: Ground

View of Internal PCB in ISA-M

Figure 4: Application, Remote Sensor, Motorized Sample Draw System

5

ENMET Corporation Gas Sampling Unit

Control

Model RX – 1G

Sensor/Transmitter

24 VDC Gas Sampling Unit

Figure 5: Wiring Diagram Gas Sampling Unit with RX-1G Control

NOTE: On some installations, the 4-20mA signal may be wired through the flow switch, so that the 4-20mA signal is

interrupted when low flow conditions occur.

6

Gas Sampling Unit ENMET Corporation

Stopcock

5.0 Operation5.0 Operation

The Gas Sampling Unit requires no calibration itself, however any sensor/transmitter or instrument associated with it
does. Follow the instructions associated with the sensor/transmitter or instrument. To insure that the calibration is
accurate with the sample draw system, you need to fill a sample bag with calibration gas.

5.1 Procedure for Sampling from Gas Bag

• Refer to Figures 6,7 and 8 for filling gas bag and attaching to Gas Sampling Unit.

• Attach the regulator to the gas cylinder. Refer to Figure 6. Use only the regulator supplied with the calibration kit.

• Attach a completely deflated gas bag (5 liter tedlar bag) to the output port of the regulator with appropriate tubing.

• Turn on the gas cylinder by rotating the knob on the regulator so gas flows into the bag. Fill the gas bag until it is

approximately 75% inflated. Close the stopcock and turn off the regulator. Remove the gas cylinder regulator and
tubing.

• Open the stopcock on the gas bag; connect the gas bag to the gas inlet port located on the Gas Sampler Unit, or the

entrance to the sensor adapter. Refer to Figures 7 and 8 for venting of calibration gas.

• Allow gas to flow for the time required for calibration of the sensor/transmitter instrument.

Sample Bag

Tubing

Regulator

Gas Cylinder

Figure 6: Filling Sample Bag from Gas Cylinder

7

ENMET Corporation Gas Sampling Unit

from escaping into environment

Inlet Port

Outlet Port

Calibration

Inlet Port

Calibration

Gas Bags

Outlet Port

Outlet port without exhaust line
requires a secondary gas bag to
collect calibration gas to prevent it

Figure 7: Venting Calibration Gas to a Gas Bag

Gas Bag

Figure 8: Venting Calibration Gas to an Exhaust Line

Outlet Port with exhaust
line to proper ventilation
area does not require a
secondary gas bag.

8

Gas Sampling Unit ENMET Corporation

6.0 Maintenance6.0 Maintenance

The flow rate of the sampling pump should be checked occasionally. The sampling pump has a diaphragm, which
may ware out. Wear on the diaphragm has a direct influence of flow rate. If the flow rate decreases, and there is no
restriction in the air line, the diaphragm may need replacing. There are two styles of diaphragm pump that have been
used in the Gas Sampling Unit. See illustrations in sections 6.1 and 6.2 to determine the replacement part numbers and
procedures for maintenance.

6.1 Pump Maintenance for Pump 04018-018

Instructions for replacing diaphragm of ENMET pump part number 04018-018
If the diaphragm becomes damaged or torn, it can be replaced.
Replacement diaphragm ENMET part number 04018-017.

Figure 9: 04018-018 Pump Features

1. Before proceeding, see if diaphragm is torn.

Stretch diaphragm by lifting armature. This will
expose a torn spot.

2. Free armature assembly and diaphragm.

Pop-off diaphragm using thumbs.

3. Swing armature up to allow removal of diaphragm.

9

ENMET Corporation Gas Sampling Unit

4. Remove diaphragm from armature by pulling it

over the retaining screw.

5. Replace diaphragm. –Wet new diaphragm hole

liberally with water.

6. Pop new diaphragm onto armature screw post.

7. Wet with water inside wall and lip of diaphragm.

8. Press diaphragm onto valve housing by pressing

armature down.

10

Gas Sampling Unit ENMET Corporation

Pump Arm

Check Valve

Diaphragm

Mounting

Star Head

6.2 Pump Maintenance for Pump 04018-118

For the maintenance of ENMET part number 04018-118.

Screw

2 places

Housing

Screws

3 places

Top View Side View

Figure 10: 04018-118 Pump Features

6.2.1 Pump Diaphragm Replacement

If the diaphragm becomes damaged or torn, it can be replaced.
Replacement diaphragm ENMET part number 04018-117.

Figure 11: Diaphragm Details

Remove 2 star head screws and pump arm. See figures 10 and 11.
Remove damaged diaphragm from pump arm and replace with new diaphragm.
Reattach pump arm and verify diaphragm is properly sealed to check valve housing.

11

ENMET Corporation Gas Sampling Unit

6.2.2 Check Valve Housing Replacement

If the check valve becomes damaged or to warn to operate correctly it can be replaced.
Pump repair kit ENMET part number 04018-116.

WARNING: The check valve housing and associated gasket must be installed in the proper position for the pump to operate

correctly. If they are installed improperly the pump will flow in the wrong direction.

Remove the outlet fittings, pump arm with diaphragm and note the orientation of the check valve hosing and gasket.
See figures 12 and13.

Remove flat-head screw and check valve housing.

Figure 12: Check Valve Housing Replacement Details

Verify that gasket and housing are in the proper position.

Verify Gasket Inside Outside

Verify Housing position – Inside and Outside

Figure 13: Proper Orientation of Check Valve Housing and Gasket

Replace check valve housing with flat head screw.
Verify proper position of check valve housing.
Reattach pump arm and reseal diaphragm
Reattach outlet fittings.

12

Gas Sampling Unit ENMET Corporation

7.0 Warranty7.0 Warranty

ENMET warrants new instruments to be free from defects in workmanship and material under normal use for a period of
one year from date of shipment from ENMET. The warranty covers both parts and labor excluding instrument calibration
and expendable parts such as calibration gas, filters, batteries, etc... Equipment believed to be defective should be returned
to ENMET within the warranty period (transportation prepaid) for inspection. If the evaluation by ENMET confirms that
the product is defective, it will be repaired or replaced at no charge, within the stated limitations, and returned prepaid to
any location in the United States by the most economical means, e.g. Surface UPS/FedEx Ground. If an expedient means
of transportation is requested during the warranty period, the customer is responsible for the difference between the most
economical means and the expedient mode. ENMET shall not be liable for any loss or damage caused by the improper use
of the product. The purchaser indemnifies and saves harmless the company with respect to any loss or damages that may
arise through the use by the purchaser or others of this equipment.

This warranty is expressly given in lieu of all other warranties, either expressed or implied, including that of
merchantability, and all other obligations or liabilities of ENMET which may arise in connection with this equipment.
ENMET neither assumes nor authorizes any representative or other person to assume for it any obligation or liability other
than that which is set forth herein.

NOTE: When returning an instrument to the factory for service:

§ Be sure to include paperwork.

§ A purchase order, return address and telephone number will assist in the expedient repair and return of your unit.

§ Include any specific instructions.

§ For warranty service, include date of purchase.

§ If you require an estimate, please contact ENMET.

There are Return for Repair Instructions and Form on the last pages of this manual. This Form can be copied or used
as needed.

13

ENMET Corporation Gas Sampling Unit

Notes:

14

PO Box 979
680 Fairfield Court
Ann Arbor, Michigan 48106-0979

734.761.1270 Fax [phone]

Returning an Instrument for Repair

ENMET instruments may be returned to the factory or any one of our Field Service Centers for
regular repair service or calibration. The ENMET Repair Department and Field Service Centers
also perform warranty service work.

When returning an instrument to the factory or service center for service, paperwork must be
included which contains the following information:

Ø A purchase order number or reference number.
Ø A contact name with return address, telephone and fax numbers
Ø Specific instructions regarding desired service or description

of the problems being encountered.

Ø Date of original purchase and copy of packing slip or invoice

for warranty consideration.

Ø If a price estimate is required, please note it accordingly and be

sure to include a fax number .

Providing the above information assists in the expedient repair and return of your unit.

Failure to provide this information can result in processing delays.

ENMET charges a one hour minimum billing for all approved repairs with additional time billed
to the closest tenth of an hour. All instruments sent to ENMET are subject to a minimum $30
evaluation fee, even if returned unrepaired. Unclaimed instruments that ENMET has received
without appropriate paperwork or attempts to advise repair costs that have been unanswered,
after a period of 60 days, may be disposed of or returned unrepaired COD with the evaluation
fee.

Service centers may have different rates or terms. Be sure to contact them for this information.

Repaired instruments are returned by UPS/FedEx Ground and are not insured unless
otherwise specified. If expedited shipping methods or insurance is required , it must be
stated in your paperwork.

Note: Warranty of customer installed components.

If a component is purchased and installed in the field, and fails within the warranty term, it can be
returned to ENMET and will be replaced, free of charge, per ENMET’s returned goods procedure.
If the entire instrument is returned to ENMET Corporation with the defective item installed, the
item will be replaced at no cost, but the instrument will be subject to labor charges at half of the
standard rate.

Repair Return Form

Mailing Address:

ENMET Corporation
PO Box 979
Ann Arbor, Michigan 48106

Phone Number: 734.761.1270
FAX Number: 734.761.3220

Your Mailing Address: Your Shipping Address:

Contact Name: __________________________ Your Phone: _______________________
Your PO/Reference Number: _______________ Your FAX: _______________________

Shipping Address:

ENMET Corporation
Attn: Repair Department
680 Fairfield Court
Ann Arbor, Michigan 48108

Payment Terms: q COD

(check one)q VISA / MasterCard______________________ ________

Card number Expiration

Return Shipping Method:

q UPS: q Ground q 3 Day Select q Next Day Air q ND Air Saver q 2-Day Air
q Federal Express: q Ground q Express Saver q P-1 q Standard q 2-Day Air
q FedEx Account number: ________________________

Would you like ENMET to insure the return shipment?

q No q Yes Insurance Amount: $_________________