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MODEL 2234
DIGITAL
FLOW COMPUTER
__________________________________________
DANIEL INDUSTRIES, INC.
HOUSTON, TEXAS
Part Number: 3-9000-333
Revision A
APRIL 1993
MODEL 2234 DIGITAL FLOW COMPUTER _____________________________
THE DANIEL INDUSTRIES, INC.
MODEL 2234
DIGITAL FLOW COMPUTER
NOTICE
DANIEL INDUSTRIES, INC. ("DANIEL") SHALL NOT BE LIABLE FOR TECHNICAL OR
EDITORIAL ERRORS IN THIS MANUAL OR OMISSIONS FROM THIS MANUAL.
DANIEL MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE WITH RESPECT TO THIS MANUAL AND, IN NO EVENT,
SHALL DANIEL BE LIABLE FOR ANY SPECIAL OR CONSEQUENTIAL DAMAGES
INCLUDING, BUT NOT LIMITED TO, LOSS OF PRODUCTION, LOSS OF PROFITS,
ETC.
PRODUCT NAMES USED HEREIN ARE FOR MANUFACTURER OR SUPPLIER
IDENTIFICATION ONLY AND MAY BE TRADEMARKS/REGISTERED TRADEMARKS OF
THESE COMPANIES.
COPYRIGHT © 1993
BY DANIEL INDUSTRIES, INC.
HOUSTON, TEXAS, U.S.A.
All rights reserved. No part of this work may be reproduced or
copied in any form or by any means - graphic, electronic or
mechanical - without first receiving the written permission of
Daniel Industries, Inc., Houston, Texas, U.S.A.
____________________________________________________________________
PREFACE
i
_____________________________ MODEL 2234 DIGITAL FLOW COMPUTER
WARRANTY
Daniel Industries, Inc. ("Daniel") 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 which is returned,
transportation prepaid to Daniel within twelve (12) months of the date of shipment (eighteen (18)
months from date of shipment for destinations outside of the United States), which is found after
inspection by Daniel to be defective in workmanship or material, will be repaired or replaced at
Daniel’s sole option, free of charge, and return-shipped at lowest cost transportation. All
transportation charges and export fees will be billed to the customer. Warranties on devices
purchased from third party manufacturers not bearing a Daniel label shall have the warranty
provided by the third party manufacturer.
Extended warranty - Models 2470, 2480 and 2500 are warranted for a maximum of twenty-four
(24) months. The Danalyzer valves are warranted for the life of the instrument and the columns
for five years.
The warranties specified herein are in lieu of any and all other warranties, express or implied,
including any warranty of merchantability or fitness for a particular purpose.
Daniel shall be liable only for loss or damage directly caused by its sole negligence. Daniel’s
liability for any loss or damage arising out of, connected with, or resulting from any breach
hereof shall in no case exceed the price allocable to the equipment or unit thereof which gives
rise to the claim. Daniel’s liability shall terminate one year after the delivery of the equipment
except for overseas deliveries and extended warranty products as noted above.
In no event, whether as a result of breach of warranty or alleged negligence, shall Daniel 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; downtime costs; or claims of customers of the purchaser for
such damages.
____________________________________________________________________
PREFACE
ii
MODEL 2234 DIGITAL FLOW COMPUTER ___________________________
SECTION 1
1.0 INTRODUCTION .................................... 1
1.1 GENERAL ..................................... 1
1.1.1 CHANGES ................................ 2
1.1.2 HARDWARE ............................... 3
1.2 SPECIFICATIONS ............................... 4
1.2.1 INPUTS ................................... 4
1.2.2 OUTPUTS ................................. 5
1.2.3 DISPLAYS ............................... 10
1.2.4 CONTROLS ............................... 12
1.2.5 ACCURACY .............................. 14
1.2.6 OTHER .................................. 15
TABLE OF CONTENTS
iii
__________________________ MODEL 2234 DIGITAL FLOW COMPUTER
SECTION 2
2.0 INSTALLATION AND INITIAL STARTUP ............... 17
2.1 GENERAL .................................... 17
2.2 UNPACKING .................................. 17
2.3 DAMAGE IN SHIPMENT ........................ 17
2.4 SHIPPING INSTRUCTIONS ...................... 18
2.5 INSTALLATION ............................... 18
2.5.1 DETERMINING OPTIONS .................... 18
2.5.2 CASE MOUNTING ......................... 20
2.5.3 ACCESS TO PLUG-IN PRINTED CIRCUIT
BOARDS ................................. 20
2.5.4 WIRING THE MODEL 2234 ................... 21
2.5.5 CONTROLLING EXTERNAL INDUCTIVE
CIRCUITS ................................ 22
2.6 STARTUP .................................... 24
2.6.1 GENERAL ................................ 24
2.6.2 STARTUP PROMPTING SEQUENCE ............ 26
2.6.3 SUPPLEMENTARY STARTUP INSTRUCTIONS .... 43
2.6.4 EXAMPLE OF STARTUP SEQUENCE ........... 47
TABLE OF CONTENTS
iv
MODEL 2234 DIGITAL FLOW COMPUTER ___________________________
SECTION 3
3.0 OPERATION ...................................... 65
3.1 GENERAL .................................... 65
3.2 BASIC CALCULATIONS ......................... 65
3.3 OPERATIONAL OVERVIEW ..................... 67
3.4 BASIC KEYBOARD/DISPLAY FUNCTIONS .......... 75
3.4.1 SELECTING TEMPORARY OR PERMANENT
DISPLAY ................................ 75
3.4.2 VALIDITY CHECKS OF DATA ENTRIES ........ 75
3.4.3 FUNCTIONS OF SPECIFIC KEYS .............. 76
3.4.4 INDICATORS ............................. 78
3.5 DATA INPUT AND OVERRIDING CONTROLS ....... 79
3.5.1 ENTERING AN OPERATOR - SELECTED VALUE . . 80
3.5.2 SWITCHING MEASURED - VALUES AND
OPERATOR - ENTERED VALUES .............. 80
3.6 DATA ACCESS ................................ 84
3.6.1 TRANSDUCER SCALING .................... 85
3.6.2 MEASUREMENTS .......................... 86
3.6.3 OPERATOR-ENTERED DATA CONSTANTS ...... 88
TABLE OF CONTENTS
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__________________________ MODEL 2234 DIGITAL FLOW COMPUTER
3.6.4 COMPUTER CALCULATED VARIABLES ........ 89
3.6.5 OUTPUT SCALING ......................... 93
3.6.6 OVER-RIDES ............................. 94
3.7 COMPUTER ACTION REQUESTS ................. 95
3.7.1 OPERATIONAL ACTIONS .................... 96
3.7.2 DIAGNOSTIC AID ACTIONS.................. 98
3.7.3 PARAMETER DISPLAY ACTIONS ............ 103
3.7.4 CLEARING ACTIONS ...................... 105
3.8 SERIAL OUTPUT FOR PRINTING ................ 106
3.8.1 READ CODE USAGE ...................... 108
3.8.2 DELAY (DLY) - READ CODE 44 .............. 108
3.8.3 DATE (DTE) - READ CODE 45 ............... 108
3.8.4 REAL TIME CLOCK (TIM) - READ CODE 46 .... 109
3.8.5 DAILY PRINT TIME (DPT) - READ CODE 47 .... 109
3.8.6 PRINT INTERVAL (INT) - READ CODE 48 ...... 109
3.8.7 IDENTIFICATION (ID) - READ CODE 49 ....... 110
3.8.8 BAUD RATE (BUD) - READ CODE 50 ......... 110
3.8.9 PRINT TABLE (P01 - P32) - READ CODES 51 - 82 . 110
TABLE OF CONTENTS
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MODEL 2234 DIGITAL FLOW COMPUTER ___________________________
3.8.10 PRINT FORMAT ......................... 111
3.9 FREQUENCY DENSITOMETER OPTION .......... 112
3.9.1 CALCULATIONS .......................... 112
3.9.2 PROMPTING SEQUENCE ................... 115
3.9.3 CONSTANTS ............................ 116
3.9.4 EXAMPLES .............................. 117
3.9.5 COMMAND CODES ....................... 125
3.9.6 ALARMS ............................... 125
3.10 CALCULATIONS - EACH METER ................ 126
3.10.1 STARTUP PROMPTING .................... 135
TABLE OF CONTENTS
vii
__________________________ MODEL 2234 DIGITAL FLOW COMPUTER
SECTION 4
4.0 CALIBRATION PROCEDURES ....................... 137
4.1 GENERAL ................................... 137
4.2 BENCH CALIBRATION ........................ 137
4.2.1 DETERMINE THE INSTRUMENT OPTIONS ..... 137
4.2.2 REQUIRED TEST EQUIPMENT ............... 137
4.2.3 PROCEDURE ............................ 138
4.2.4 POWER SUPPLY ADJUSTMENTS ............. 138
4.3 FIELD CALIBRATION ......................... 141
4.3.1 RATE VOLTAGE CALIBRATION ............. 141
4.3.2 REFERENCE VOLTAGE CALIBRATION ......... 142
4.3.3 RATE CURRENT CALIBRATION .............. 142
4.3.4 DENSITY CURRENT CALIBRATION ........... 146
TABLE OF CONTENTS
viii
MODEL 2234 DIGITAL FLOW COMPUTER ___________________________
SECTION 5
5.0 MAINTENANCE .................................. 147
5.1 GENERAL ................................... 147
5.2 PREVENTIVE MAINTENANCE .................. 147
5.3 RECOMMENDED SPARE PARTS ................. 147
5.4 CUSTOMER SERVICE REPORT ................. 148
5.5 SHIPPING INSTRUCTIONS ..................... 148
APPENDIX A: READ CODE LISTING ...................... 149
APPENDIX B: DRAWINGS AND PARTS LIST ................ 159
TABLE OF CONTENTS
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TABLE OF CONTENTS
x
MODEL 2234 DIGITAL FLOW COMPUTER ___________________________
1.0 INTRODUCTION
1.1 GENERAL
The Model 2234 Flowmaster Digital Flow Computer is a microprocessor based
instrument which is used with differential head meters to measure and display flow
rate and compensated total flow.
This manual covers software revisions for Daniel Model 2234 flow computers. The
Model 2234 is a mass flow computer for use with orifice meters. Additionally, the
density of vapor phase ethylene is computed per API-2565.
The Software revisions include:
· Delete flow calculations and all operator access (read codes, command codes,
error codes) associated with 1969 revision of standard AGA-3.
· Add flow calculations for mass flow computations in accordance with the
1991 revision of MPMS Chapter 14.3 (ANSI/API 2530, AGA-3). This
includes all read codes, command codes, and error codes.
· Add computation of viscosity for ethylene.
SECTION 1
1
__________________________ MODEL 2234 DIGITAL FLOW COMPUTER
1.1.1 CHANGES
It is intended that Model 2230 Series functionality be maintained. Intermediate
calculations will have read code assignments and default to the "VAR" mode. If
operators desire to override a particular calculation, the read code is put into the
"FXD" mode.
The startup prompting is modified to add entry information required for compliance
with the new measurement standard. For example, there will no longer be a
selection for "TAPTYPE". There will be entries for thermal expansion coefficients
for both the orifice plate and meter tube.
The 800 and 900 series Read Codes will be unchanged in functionality regarding
display of Mass Rates and Mass Totals both for individual lines and Station Totals.
An operator selection for TAPLOC is included. If downstream taps are selected
the Model 2234 will compute upstream pressure based upon differential pressure.
Only the upstream expansion factor will be computed.
A keyboard entry for isentropic exponent is included.
The Model 2234 operator interface consists of a 24-key control keyboard for
entering data and functions and an eight character alpha-numeric display. The
operator interface permits the operator to enter, inspect, and change measurement
parameters; the operator may enter deviation/alarm limits related to critical
transducer values, flow rates and totals. Optionally, totalized volume also may be
displayed on a six-digit electro-mechanical counter on the instrument front panel.
SECTION 1
2
MODEL 2234 DIGITAL FLOW COMPUTER ___________________________
1.1.2 HARDWARE
The computer is contained in a standard Daniel Industries, Inc. industrial housing
which is 4-inches wide by 8-1/16 inches high by 21-5/16 inches long. These
dimensions include an externally mounted 24 VDC or 115/230 VAC power supply
at the rear of the unit.
It is intended and anticipated that the software described herein will be installed in
a large number of existing computers in the field. To minimize field difficulty, no
hardware changes are to be required for existing computers originally built as
Model 2234-XX3. That is, there will be 4k of RAM on board #1 and the software
will reside in the 2716 EPROM. Existing computers originally built as Model
2234-XX1 will require an upgrade of board #1 to include full RAM capability and
board #2 will of necessity be replaced.
All hardware I/O assignments are to remain unchanged from the current program
"FULLETH" P/N 8-2230-008, Rev.L. This requirement is also to minimize impact
on instruments in service.
SECTION 1
3
__________________________ MODEL 2234 DIGITAL FLOW COMPUTER
1.2 SPECIFICATIONS
1.2.1 INPUTS
Pressure, Densitometer and Temperature
1. Number of Inputs -
· One - Static Pressure, scaled in PSIA
· Five - Differential Pressure, scaled in inches of water.
· One - Density, scaled in LBF3.
· One - Temperature, scaled in
o
F.
2. Type Input - Differential for 4 - 20 mA signal from any range
transducer within the range of:
· 0 - 5000 PSIA for Static Pressure
· 0 - 1000 inches of water for Differential Pressure
· 0 - No upper limit LBF3 for Density
· -50
o
F to +250
o
F for Temperature
3. Differential Input Range-3to21mA.
4. Differential Input Resistance - 250 Ohms ±0.05%.
5. Differential Input Filter - -52 db @ 60 Hz.
6. Common Mode Input Range-0Vto+15Vwith respect to
"common".
7. Common Mode Input Resistance - Greater than 10 meg Ohms.
8. Common Mode Rejection Ratio - Greater than 2000: 1.
SECTION 1
4
MODEL 2234 DIGITAL FLOW COMPUTER ___________________________
Frequency Densitometer
1. Number of Inputs - One
2. Type Input - DC coupled for nominal frequency signal as indicated.
· Solartron device - Square wave 0 to -6 V peak (Requires
external capacitive level shifting. Refer to field wiring
diagram.)
· Barton device - Square wave 0 to +15 V peak
· Agar device - Square wave 0 to +10 V peak
3. Frequency Range - 1000 to 5000 Hz, minimum pulse width of
0.1 ms.
· Solartron device - 1000 Hz to 1350 Hz.
· Barton device - 1500 Hz to 2500 Hz
· Agar device - 500 Hz to 2000 Hz
4. Input Resistance - 27 K Ohms.
1.2.2 OUTPUTS
A. 0 - 10 Volts Rate - Mass
1. Range - Zero to +10.00 V signal, scalable by keyboard entry to
represent from 0.00 to N pounds per hour. Absolute maximum
range is 0.00 to 10.62 volts.
2. Maximum Load-5mA(2KOhms, minimum).
3. Response Time - Turbine input to Rate Output - 2 seconds,
typical.
SECTION 1
5
__________________________ MODEL 2234 DIGITAL FLOW COMPUTER
B. 4 - 20 mA Rate - Mass
1. Range-4to20mAsignal scalable by keyboard entry to
represent from 0.00 to N pounds per hour. Absolute
maximum range is 4 to 21 mA.
2. Maximum Load Resistance - 900 Ohms (18 V) to common.
3. Response Time - Differential Pressure Input to Rate Output -
2 seconds typical.
C. Density,0-10V
1. Range - 0.00 to +10.00 V signal, scalable by keyboard entry
to represent X to Y pounds per cubic foot. Absolute
maximum range is zero to 10.62 Volts.
2. Maximum Load-5mA(2KOhms minimum).
3. Response Time, Densitometer input to Density Output -
2 seconds, typical (for densitometer mode).
4. Response Time, Temperature and/or Static Pressure Input to
Density Output - 4 seconds, typical (for API-2565 mode).
D. Density,4-20mA2
1. Range - Four to 20 mA signal, scalable by keyboard entry to
represent X to Y pounds per cubic foot. Absolute maximum
range is 4 to 21 mA.
2. Maximum Load Resistance - 900 Ohms (18 V) to common.
3. Response Time, Temperature and/or Static Pressure Input to
Density Output - 4 seconds, typical (for API-2565 mode).
4. Response Time, Densitometer Input to Density Output -
2 seconds, typical (for densitometer mode).
SECTION 1
6
MODEL 2234 DIGITAL FLOW COMPUTER ___________________________
E. Volume Totals, Contact Closure - Mass
1. Rating - Form A contact, 30 V DC or AC. 0.75 Amp,
10 VA resistive, 3.5 VA inductive.
________________________________________________________
NOTE: For inductive loads, the user is responsible for providing
resistive/capacitive suppression for the contact.
________________________________________________________
2. Scaling - One closure per least significant digit advance of the
Station Total Display.
3. Maximum Instantaneous Rate - 25 per second. (See item 5 to
determine maximum continuous rate)
4. Duration - 20 ms, nominal.
5. Rate Contact Life -
· 200,000,000 counts at minimum load.
· 10,000,000 counts at maximum load.
SECTION 1
7
__________________________ MODEL 2234 DIGITAL FLOW COMPUTER
F. Direction Sense Contacts (2) (See option diagram, Figure 2-1).
1. Rating - Form A contacts, 30 V DC or AC, 0.75 Amp, 10 VA
resistive, 3.5 VA inductive.
________________________________________________________
NOTE: For inductive loads, it is the responsibility of the user to
provide arc suppression for the contact.
_______________________________________________________
2. Forward contact closes in response to input differential pressure
above low flow cutoff on line 1. Reverse contact closes in
response to input differential pressure above low flow cutoff for
line 2. For proper operation of direction sense, the bi-
directional line must be configured as two separate lines.
SECTION 1
8
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