Teledyne NALL User Manual

TELEDYNE
HASTINGS

INSTRUMENTS

INSTRUCTION MANUAL

MODEL NALL

MASS FLOWMETERS

ISO 9001

CERTIFIED

Manual Print History

The print history shown below lists the printing dates of all revisions and addenda created for this manual.
The revision level letter increases alphabetically as the manual undergoes subsequent updates. Addenda,
which are released between revisions, contain important change information that the user should incorporate
immediately into the manual. Addenda are numbered sequentially. When a new revision is created, all
addenda associated with the previous revision of the manual are incorporated into the new revision of the
manual. Each new revision includes a revised copy of this print history page.

Revision A (Document Number 111-041990) ................................................................... April 1990

Revision B (Document Number 111-102003)............................................................... October 2003

Revision C (Document Number 111-082005) ................................................................August 2005

Revision D (Document Number 111-022006) ............................................................. February 2006

Revision E (Document Number 111-052007).....................................................................May 2007

Revision F (Document Number 111-082010)................................................................. August 2010

Revision G (Document Number 111-122010) ........................................................... December 2010

Visit www.teledyne-hi.com for WEEE disposal guidance.

CAUTION:

CAUTION:

CAUTION:

The instruments des cribed in this manual are av ailable w ith multiple pin-outs .

Ensure that all electrical connections are correct.

The instruments des cribed in this manual are des igned for INDOOR us e only .

The instruments described in this manual are designed for Class 2 installations

in accordance with IAW/IPC standards

Hastings Instruments reserves the right to change or modify the design of its equipment without

any obligation to provide notification of change or intent to change.

Manual 111-082010_Nall Mass Flowmeters Page 2 of 23

Table of Contents

1.0

GENERAL INFORMATION....................................................................................................................................... 5

1.1 FEATURES:................................................................................................................................................................... 5

2.0 OPERATING PRINCIPLE.......................................................................................................................................... 6

2.1 OPERATING PRINCIPLE.................................................................................................................................................6

3.0 RECEIVING AND INSPECTION...............................................................................................................................7

3.1 INITIAL INSPECTION:.................................................................................................................................................... 7

3.2 PACKING LIST:.............................................................................................................................................................7

3.3 DECIMAL POINT SETTING: ........................................................................................................................................... 7

3.4 POWER SOURCE:.......................................................................................................................................................... 7

3.5 ELECTRICAL ZERO:...................................................................................................................................................... 7

3.6 INDICATION OF FLOW: ................................................................................................................................................. 7

4.0 INSTALLATION INSTRUCTIONS............................................................................................................................8

4.1 TRANSDUCER.......................................................................................................................................................... 8

4.2 FILTERS:.................................................................................................................................................................... 9

4.3 CABLES.....................................................................................................................................................................9

4.4 POWER SUPPLY:...................................................................................................................................................... 9

5.0 USING THE FLOWMETER......................................................................................................................................11

5.1 WARM-UP TIME: .......................................................................................................................................................11

5.2 RESPONSE TIME:........................................................................................................................................................ 11

5.3 MASS FLOW UNITS:................................................................................................................................................... 11

5.4 SPECIAL FACTORY CALIBRATIONS: ........................................................................................................................... 11

5.5 GAS CONVERSION FACTORS:.....................................................................................................................................11

5.6 OUTPUT SIGNAL: .......................................................................................................................................................12

5.7 ACCURACY:...............................................................................................................................................................13

5.8 REPEATABILITY:........................................................................................................................................................ 13

5.9 OVER-RANGE:............................................................................................................................................................ 13

6.0 PRESSURE EFFECTS................................................................................................................................................14

6.1 STANDARD TRANSDUCERS: .......................................................................................................................................14

6.2 LOW PRESSURE DROP TRANSDUCERS:....................................................................................................................... 14

6.3 HIGH PRESSURE TRANSDUCERS (OPTIONAL):............................................................................................................ 14

7.0 TEMPERATURE EFFECTS......................................................................................................................................15

7.1 AMBIENT TEMPERATURES:........................................................................................................................................15

7.2 GAS TEMPERATURE ...................................................................................................................................................15

8.0 DIFFERENTIAL PRESSURE....................................................................................................................................16

8.1 TYPICAL PRESSURE DROPS................................................................................................................................16

8.2 CHANGES IN DP WITH CHANGES IN LINE PRESSURE................................................................................... 16

8.3 DP INCREASE DUE TO FOULING OF THE TRANSDUCER: ............................................................................................. 17

9.0 CALIBRATION........................................................................................................................................................... 18

9.1 CALIBRATION PROCEDURES.............................................................................................................................18

10.0 MAINTENANCE......................................................................................................................................................... 20

10.1 TRANSDUCERS:.......................................................................................................................................................... 20

10.2 POWER SUPPLY:.........................................................................................................................................................20

11.0 ACCESSORIES...........................................................................................................................................................21

11.1 OPTIONS AND ACCESSORIES............................................................................................................................. 21

11.2 DOUBLE POINT RELAY FLOWMETER/ALARM (DNALL-P):....................................................................................... 21

11.3 TOTALIZERS (TNALL-P):.......................................................................................................................................... 21

11.4 CHASSIS MODEL (NALL-C):..................................................................................................................................... 22

11.5 CURRENT CONVERTER (NALL-P/CC):.......................................................................................................................22

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11.6 SPECIFICATIONS................................................................................................... ERROR! BOOKMARK NOT DEFINED.

12.0 WARRANTY AND REPAIR......................................................................................................................................23

12.1 WARRANTY REPAIR POLICY ...................................................................................................................................... 23

12.2 NON-WARRANTY REPAIR POLICY .............................................................................................................................23

Manual 111-082010_Nall Mass Flowmeters Page 4 of 23

1.0 General Information

1.1 Features:

Hastings Linear Mass Flowmeters are designed to accurately measure mass flow without corrections or
compensations for gas pressure and temperature. Due to a linear electrical output signal, the flowmeters are
ideal for use with totalizers and recorders. Hastings Linear Mass Flowmeters do not require any periodic
maintenance under normal operating conditions with clean gases. No damage will occur from the use of
moderate overpressures, overflows, or liquid solvents.

The standard flowmeter calibration is for air. Special calibrations for most other gases such as oxygen,
nitrogen, hydrogen, and carbon monoxide, are available on special order, or by use of a gas multiplier.
Special calibrations are noted by the following options such as OPT-G (special gas) or OPT-R (special
range) and OPT-GR (special gas and range).

Standard HS-Series transducer and L-Series laminar flow elements are available with 300 Series stainless
steel or monel construction. U-Series low pressure drop transducers are constructed of monel.

The basic flowmeter is available in either a cabinet model or a NIM panel. The NIM model can be mounted
side by side in groups of three, in an optional NIM frame. Chassis models are available on special order.

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2.0 OPERATING PRINCIPLE

2.1 Operating Principle

Hastings Linear Mass Flowmeters operate
on a unique electrical principle whereby a
capillary tube is heated uniformly by a
transformer. The temperature distribution
is symmetrical about the midpoint at zero
flow (see Figure 2.1) and external
thermocouples TC-1 and TC-2 develop
equal and opposing outputs.

When flow occurs through the tubing,
heat is transferred to the gas and back
again creating an asymmetrical
temperature distribution. For a constant
power input, the differential thermocouple
output is a function of the mass flow rate
and heat capacity of the gas. Since the
heat capacity is relatively constant over
wide ranges of temperature and pressure,
the flowmeter may be calibrated directly
in mass units for any given gas. Changes
in gas composition only require simple
multiplier applied to the air calibration
(see table, page 19) to account for the
difference in heat capacity, thus the
flowmeter is capable of measuring a wide
variety of gases.

High ranges of flow are achieved by
dividing the flow with a fixed ratio
shunting arrangement, as is illustrated in
Figure 2.2. By placing the measuring
tube in parallel with one or more
dimensionally similar channels (laminar
flow elements), viscous restrictions are

created. Therefore, the sensor need heat
only a small portion of the total gas which
results in low power requirements while
retaining mass measuring characteristics.

Fig 2.1

Fig 2.2

Manual 111-082010_Nall Mass Flowmeters Page 6 of 23

3.0 RECEIVING AND INSPECTION

3.1 Initial Inspection:

Carefully unpack the Hastings Linear Mass Flowmeter and inspect it for any obvious signs of damage due to
shipment. Immediately advise the carrier who delivered the shipment of any suspected damage.

3.2 Packing List:

The basic flowmeter consist of four separate parts:

1. The power supply (NALL, NALL-P, NALL-P/CC, DNALL-P, TNALL-P, NALL-C, etc.)

2. The transducer (examples: HS-10S, HS-50KM, etc.)

3. The connecting cable (examples: NF-8-NM, NF-25-NM, etc.)

4. The laminar flow element attached to transducer, for ranges higher than 0-100 SLPM (examples: L-5S,
L-100SF, L-200MF, etc.)

Optional equipment or accessories will be listed as part of the model number or listed separately on the
packing list. (See Section 11.0, OPTIONS AND ACCESSORIES.)

3.3 Decimal Point Setting:

The digital flowmeter has a 3-digit LED display. The decimal point is set as shown in the table below:

3.4 Power Source:

Connect the power supply to 115 volt (10%) 50-60 Hz line. (The prefix “E” indicates the power supply is to
be connected to a 230 volt (10%) 50-60 Hz line.) Connect the power supply to the transducer by means of
the connecting cable. When the flowmeter is turned on the readout may fluctuate somewhat, before settling
to a steady indication.

3.5 Electrical Zero:

After allowing a warm-up time of approximately 30 minutes, close off the INLET and OUTLET
connections on the transducer with the protective plastics end caps shipped on the transducer. If the meter
does not indicate zero flow, adjust the “ZERO” potentiometer located on the front panel, until the meter
indicates zero.

3.6 Indication of Flow:

Remove the end plug or end cap from each end of the transducer and blow air into the inlet side. (The
meter readout should increase indicating the flowmeter is in good working order and ready for installation.)

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