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MODEL 2231P (P,T,G)
DIGITAL
FLOW COMPUTER
__________________________________________
DANIEL MEASUREMENT AND CONTROL
HOUSTON, TEXAS
Part Number: 3-9000-321
Revision B
MAY 1996
MODEL 2231P DIGITAL FLOW COMPUTER ___________________________
DANIEL INDUSTRIES, INC.
MODEL 2231P (P,T,G)
DIGITAL FLOW COMPUTER
FOR DIFFERENTIAL HEAD METERS
GROSS METHOD 2 IMPLEMENTATION
NOTICE
DANIEL INDUSTRIES, INC. AND DANIEL MEASUREMENT AND CONTROL ("DANIEL")
SHALL NOT BE LIABLE FOR TECHNICAL OR EDITORIAL ERRORS IN THIS MANUAL
OR OMISSIONS FROM THIS MANUAL. DANIEL MAKESNO 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 © 1995
BY DANIEL MEASUREMENT AND CONTROL
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 Measurement and Control, Houston, Texas, U.S.A.
____________________________________________________________________
PREFACE
i
___________________________ MODEL2231P DIGITAL FLOW COMPUTER
WARRANTY
Daniel Measurement and Control ("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 2231P DIGITAL FLOW COMPUTER ___________________________
TABLE OF CONTENTS
1.0 INTRODUCTION .................................... 1-1
1.1 GENERAL .................................... 1-1
1.1.1 HARDWARE .............................. 1-2
1.2 SPECIFICATIONS ............................... 1-3
1.2.1 INPUTS .................................. 1-3
1.2.2 OUTPUTS ................................ 1-4
1.2.3 DISPLAYS ................................ 1-7
1.2.4 CONTROLS ............................... 1-9
1.2.5 ACCURACY ..............................1-11
1.2.6 OTHER ..................................1-12
2.0 INSTALLATION AND INITIAL STARTUP ................. 2-1
2.1 GENERAL .................................... 2-1
2.2 UNPACKING .................................. 2-1
2.3 DAMAGE IN SHIPMENT ......................... 2-1
2.4 SHIPPING INSTRUCTIONS ....................... 2-2
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TABLE OF CONTENTS
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___________________________ MODEL2231P DIGITAL FLOW COMPUTER
2.5 INSTALLATION ................................ 2-2
2.5.1 DETERMINING OPTIONS .................... 2-2
2.5.2 CASE MOUNTING ......................... 2-4
2.5.3 ACCESS TO PLUG-IN PRINTED CIRCUIT BOARDS 2-4
2.5.4 WIRING THE MODEL 2231P .................. 2-5
2.5.5 CONTROLLING EXTERNAL INDUCTIVE
CIRCUITS ................................ 2-6
2.6 START UP .................................... 2-8
2.6.1 GENERAL ................................ 2-8
2.6.2 START UP PROMPTING SEQUENCE ............2-10
2.6.3 SUPPLEMENTARY START UP INSTRUCTIONS . . . 2-26
3.0 OPERATION ....................................... 3-1
3.1 GENERAL .................................... 3-1
3.2 CALCULATIONS - PER STATION .................. 3-1
3.3 OPERATIONAL OVERVIEW ......................3-12
3.4 BASIC KEYBOARD/DISPLAY FUNCTIONS ...........3-19
3.4.1 SELECTING TEMPORARY OR PERMANENT
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TABLE OF CONTENTS
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MODEL 2231P DIGITAL FLOW COMPUTER ___________________________
DISPLAY ................................3-19
3.4.2 VALIDITY CHECKS OF DATA ENTRIES .........3-19
3.4.3 FUNCTIONS OF SPECIFIC KEYS ..............3-20
3.4.4 INDICATORS .............................3-22
3.5 DATA INPUT AND OVERRIDING CONTROLS .........3-23
3.5.1 ENTERING AN OPERATOR - SELECTED VALUE . . 3-24
3.5.2 SWITCHING MEASURED AND OPERATOR
ENTERED VALUES .........................3-25
3.6 DATA ACCESS ................................3-29
3.6.1 TRANSDUCER SCALING ....................3-30
3.6.2 MEASUREMENTS ..........................3-31
3.6.3 OPERATOR-ENTERED DATA CONSTANTS ......3-32
3.6.4 COMPUTER CALCULATED VARIABLES ........3-39
3.6.5 OUTPUT SCALING .........................3-46
3.7 COMPUTER ACTION REQUESTS ...................3-48
3.7.1 OPERATIONAL ACTIONS ....................3-49
3.7.2 DIAGNOSTIC AID ACTIONS ..................3-50
3.7.3 PARAMETER DISPLAY ACTIONS ..............3-53
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___________________________ MODEL2231P DIGITAL FLOW COMPUTER
3.7.4 CLEARING ACTIONS .......................3-54
3.8 SERIAL OUTPUT FOR PRINTING ..................3-56
3.8.1 READ CODE USAGE ........................3-58
3.8.2 DELAY (DLY) - READ CODE 44 ...............3-58
3.8.3 DATE (DTE) - READ CODE 45 ................3-58
3.8.4 REAL TIME CLOCK (TIM) - READ CODE 46 .....3-59
3.8.5 DAILY PRING TIME (DPT) - READ CODE 47 .....3-59
3.8.6 PRINT INTERVAL (INT) - READ CODE 48 .......3-59
3.8.7 IDENTIFICATION (ID) - READ CODE 49 .........3-60
3.8.8 BAUD RATE (BUD) - READ CODE 50 ...........3-60
3.8.9 PRINT TABLE (P01 - P32) - READ CODES 51 - 82 . . 3-60
3.8.10 PRINT FORMAT .......................3-61
4.0 BENCH CALIBRATION ............................... 4-1
4.1 GENERAL .................................... 4-1
4.1.1 CIRCUIT BOARD REVISIONS ................. 4-1
4.2 BENCH CALIBRATION PROCEDURE ............... 4-3
4.2.1 DETERMINE THE INSTRUMENT OPTIONS ....... 4-3
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TABLE OF CONTENTS
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MODEL 2231P DIGITAL FLOW COMPUTER ___________________________
4.2.2 PROCEDURE .............................. 4-3
4.2.3 TEST EQUIPMENT ......................... 4-4
4.2.4 POWER SUPPLY ADJUSTMENTS .............. 4-4
4.3 FIELD CALIBRATION ........................... 4-5
4.3.1 RATE VOLTAGE CALIBRATION .............. 4-5
4.3.2 RATE CURRENT CALIBRATION ............... 4-5
4.3.3 REFERENCE VOLTAGE CALIBRATION ......... 4-6
5.0 MAINTENANCE .................................... 5-1
5.1 GENERAL .................................... 5-1
5.2 PREVENTIVE MAINTENANCE .................... 5-1
5.3 RECOMMENDED SPARE PARTS ................... 5-1
5.4 FACTORY SERVICE FAILURE REPORT.............. 5-1
5.5 SHIPPING INSTRUCTIONS ....................... 5-1
6.0 DRAWINGS AND PARTS LIST ......................... 6-1
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TABLE OF CONTENTS
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MODEL 2231P DIGITAL FLOW COMPUTER ___________________________
1.0 INTRODUCTION
1.1 GENERAL
The Model 2231P (P,T,G) Flowmaster Digital flow computer is a microprocessor based
instrument which is used with differential head meters to measure and display flow rate and total
flow. FPV is calculated either from the 1992 AGA-8 gross method or from matrix density
points. Premium base flow totals for base level 1 and level 2 are calculated from operator-
entered setpoints.
This manual covers the standard Daniel Model 2231P Flow Computer and resulting software
revisions.
The Software revisions include:
A. Delete flow calculations and all operator access (read codes, command codes, error codes)
associated with 1969 revision of standard AGA-3.
B. Add flow calculations for volume flow in accordance with the 1992 revision of MPMS
Chapter 14.3 (ANSI/API 2530, AGA-3). This includes all read codes, command codes,
and error codes.
C. Delete computation of supercompressibility for NX-19 and replace with density
calculation per Gross Method 2 of 1992 Edition of AGA-8.
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SECTION 1
1-1
___________________________ MODEL2231P DIGITAL FLOW COMPUTER
1.1.1 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. Internally, the
computer contains either one or two plug-in printed circuit boards, depending upon the options
selected by the customer.
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INTRODUCTION
1-2
MODEL 2231P DIGITAL FLOW COMPUTER ___________________________
1.2 SPECIFICATIONS
1.2.1 INPUTS
Pressure, Differential Pressure and Temperature
1. Number of Inputs -
One - Static Pressure, scaled in PSIA
Five - Differential Pressure, scaled in inches of water.
One - Gravity, scaled in SGU.
One - Temperature, scaled in F.
2. Type Input - Differential for4-20mAsignal from any range transducer within the range
of:
0 - 5000 PSIA for Static Pressure (0 - 1750 PSIA for AGA-8)
0 - 1000 inches of water for Differential Pressure
.0001 minimum SGU for Gravity
-400
o
F minimum for Temperature (17.0 - 143.0 for AGA-8)
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.
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SECTION 1
1-3
___________________________ MODEL2231P DIGITAL FLOW COMPUTER
1.2.2 OUTPUTS
A. 0 - 10 Volts Flow Rate
1. Range - Zero to +10.00 V signal, scalable by keyboard entry to represent from
0.00 to N standard cubic feet per hour. Absolute maximum range is 0.00 to 10.62
volts.
2. Maximum Load-5mA(2KOhms, minimum).
3. Response Time - Differential pressure input to flow rate output - 2 seconds,
typical.
B. 4 - 20 mA Flow Rate
1. Range-4to20mAsignal scalable by keyboard entry to represent from 0.00 to
N standard cubic feet per hour. Absolute maximum range is 4 to 21 mA.
2. Maximum Load Resistance - 900 Ohms (18V) to common.
3. Response Time - Differential Pressure Input to Rate Output - 2 seconds typical.
C. Contact Closure Outputs
1. Number of contact closure outputs - Four
Volume Total
· Premium Base Total
· Premium Level 1 Total
· Premium Level 2 Total
2. Rating - Form A contact, 30 Vdc or ac, 0.75A, 10 VA resistive, 3.5 VA inductive.
NOTE: For inductive loads, the user is responsible for providing arc suppression for the
contact closure.
3. Scaling - One closure per least significant digit advance of the displayed value.
4. Maximum Rate - 25 closures per second.
5. Duration - 20 ms, nominal.
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INTRODUCTION
1-4
MODEL 2231P DIGITAL FLOW COMPUTER ___________________________
D. Contact Closure Outputs - Status
1. Number of contact closure outputs - two
Premium Level 1 Status
Premium Level 2 Status
2. Contacts close when station flow exceeds operator-entered setpoint for respective
premium level.
3. Rating - Form A contact, 30 Vdc or ac, 0.75, VA resistive, 3.5 VA inductive.
NOTE: For inductive leads, the user is responsible for providing arc suppression for the
contact closure.
E. Alarm Contact Closure
1. Rating - Form C contact, 30 Vdc 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. Function - Changes state to indicate power failure, processor failure, or other
alarm condition. The operation is fail safe. The relay is held in a normally
energized state. Upon any fault, including loss of power, the relay is de-
energized.
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SECTION 1
1-5
___________________________ MODEL2231P DIGITAL FLOW COMPUTER
F. Serial Output
1. Baud Rate - Operator selectable. Standard rates from 150 to 2400 baud.
2. Type - Ten bits in ASCII serial form.
3. Voltage Levels - RS232C. +12V to -12V
Logic0-+3Volts minimum.
Logic1--3Volts minimum.
4. Character Frequency - Maximum 1 character per 20 msec., regardless of baud rate.
G. Transducer Power - Regulated +24 Vdc, 300 mA. Ripple, 100 mV maximum for 300 mA
resistive load.
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INTRODUCTION
1-6
MODEL 2231P DIGITAL FLOW COMPUTER ___________________________
1.2.3 DISPLAYS (Refer to Figure 1-1)
A. Eight-digit alpha/numeric
1. Sixteen-segment LED.
2. Full 64-character ASCII Code.
B. Six-digit mechanical counter without reset, for Station Net totals (See option diagram).
C. Status indicators
1. Red LED - indicates a current error or alarm condition. This LED is ON if either
the Watch-dog Timer has timed out or another condition exists.
2. Yellow LED - Indicates that an error condition has occurred since all errors were
last cleared via the keyboard even though the error condition no longer exists.
3. Green LED - Indicates that the operator may enter or change data in the computer
via the keyboard. The enter/change capability is enabled by placing the
enable/disable switch in PC board No.1 in the ENABLE position.
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SECTION 1
1-7
___________________________ MODEL2231P DIGITAL FLOW COMPUTER
Figure 1-1. Model 2231 Display
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INTRODUCTION
1-8
MODEL 2231P DIGITAL FLOW COMPUTER ___________________________
1.2.4 CONTROLS
A. Enable/Disable Switch - Located on PC Board No.1 (Figure 1-2)
1. ENABLE position - Permits the operator to enter or change critical constants or
scaling. NOTE - Does not stop computer calculation.
2. DISABLE position - Prevents using the keyboard to enter or change critical
constants or scaling.
Figure 1-2. PC Board No. 1 (Revised version P/N DE-10421)
NOTE: Although there are two versions of PC Board No. 1 (Original
version P/N DE-8992 and Revised version P/N DE-10421), the
location and function of switch S1 is the same for both.
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SECTION 1
1-9
___________________________ MODEL2231P DIGITAL FLOW COMPUTER
B. Keyboard - 24 Keys (Refer to Figure 1-1)
1. Enter (ENTR) - Inputs into memory any valid data shown on the Alpha/Numeric
display.
2. Display (DSPY) - Recalls blanked data to the display when operation is in
"display timeout" (see Subsection 3.7.1).
3. Numerals, period (.), and minus sign (-) - For entering numerical data or function
codes.
4. Read (READ) - Entering a one- two- or three-digit function numerical code and
depressing READ displays the data being used or calculated by the computer (see
Table 3-1).
5. Fixed (FXD) - Depressing FXD displays data stored in the computer by the
operator (e.g., pressure, temperature, gravity, etc.). An asterisk displayed with the
data identifier indicates that the computer is not currently using the data value for
its computations.
6. Variable (VAR) - Depressing VAR displays data from a transducer or a computer
calculation. An asterisk displayed with the data identifier indicates that the
computer is not currently using the data for its computations.
7. Clear (CLR) - Depressing CLR removes entered data values from the data code
displayed and displays "0.0".
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INTRODUCTION
1-10
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