WIKA CPT6010 User manual

Operating Instructions
Digital Pressure Transducer
Digital Pressure Transducer CPT6010 PN 0017063001U • 12/2018
CPT6010

2 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
This Warning symbol indicates that danger of injury for persons and the
environment and/or considerable damage (mortal danger, danger of injury)
will occur if the respective safety precautions are not taken.
This Caution symbol indicates danger for the system and material if the
respective safety precautions are not taken.
This Notice symbol does not indicate safety notices but information for a
better understanding of the facts.
!
Caution
i
Notice
Warning
!

CPT6010 Operating Instructions 3
Digital Pressure Transducer
CPT6010
1. General Information 5
1.1 Warranty 5
1.2 Important Notice 5
1.3 Software License Agreement 6
1.4 Mensor Service Plus 6
1.4.1 After the Warranty 6
1.4.2 Calibration Services 6
1.4.3 Accreditations 6
2. Safety Notices 7
2.1 Warnings and Caution Notices 7
3. Product Description 9
3.1 General Description 9
3.2 Turndowns 9
3.3 Power Supply 9
3.4 Sensor 9
3.5 Circuitry 9
3.6 Serial In/Out Communications 9
4. Specications 11
5. Installation 13
5.1 Unpacking the instrument 13
5.2 Dimensions 13
5.3 Conguration 13
5.4 Mounting 13
5.5 Pressure Connections 14
5.6 Electrical Connections 14
5.6.1 Connector J1 Wiring 14
5.6.2 RS-232 Operation 14
5.6.3 RS-485 Operation 15

4 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
6. Operation 17
6.1 Multiple Turndown Devices 17
6.1.1 Filter Eects of Multiple Turndowns 17
6.2 Serial Port Conguration 18
6.3 CPT6010 Address 18
6.3.1 Addressing Devices with two Turndowns 18
6.4 Communication Syntax and Command Conventions 19
6.4.1 Wildcard Address Operator (*) 19
6.4.2 Password Protection 19
6.4.3 Response String Format 19
6.4.4 Commands and Queries 20
6.4.5 Pressure Unit Code and Conversion 21
7. Calibration 23
7.1 Environment 23
7.2 Equipment 23
7.3 Pressure Standard 25
7.4 Calibration Medium 25
7.5 Calibration Process 25
7.6 Correction Value Query 25
7.7 Zero Adjustment 26
7.7.1 Gauge/Dierential Zero Oset 26
7.7.2 Absolute Zero Oset 27
7.8 Span Adjustment 28

CPT6010 Operating Instructions 5
Digital Pressure Transducer
CPT6010
1. General Information
1.1 Warranty
All products manufactured by Mensor are warranted to be free of defects in workmanship and
materials for a period of one year from the date of shipment. No other express warranty is given,
and no armation of Seller, by words or actions, shall constitute a warranty. SELLER DISCLAIMS
ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR
PURPOSES WHATSOEVER. If any defect in workmanship or material should develop under
conditions of normal use and service within the warranty period, repairs will be made at no charge
to the original purchaser, upon delivery of the product(s) to the factory, shipping charges prepaid.
If inspection by Mensor or its authorized representative reveals that the product was damaged by
accident, alteration, misuse, abuse, faulty installation or other causes beyond the control of Men-
sor, this warranty does not apply. The judgment of Mensor will be nal as to all matters concerning
condition of the product, the cause and nature of a defect, and the necessity or manner of repair.
Service, repairs or disassembly of the product in any manner, performed without specic factory
permission, voids this warranty.
MENSOR MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MANUAL, INCLUD-
ING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT-
NESS FOR A PARTICULAR PURPOSE. Mensor shall not be liable for errors contained herein or
for incidental or consequential damages in connection with the furnishing, performance, or use of
this material.
1.2 Important Notice
The product specications and other information contained in this manual are subject to change
without notice.
Mensor has made a concerted eort to provide complete and current information for the proper use
of the equipment. If there are questions regarding this manual or the proper use of the equipment,
contact either Mensor or WIKA:
Mensor WIKA Alexander Wiegand SE & Co. KG
201 Barnes Drive Alexander-Wiegand-Straße 30
San Marcos, TX 78666 D-63911 Klingenberg / Germany
tel: [phone] tel: [phone]
1-800-984-4200 (USA only) website: www.wika.de
website: www.mensor.com fax: [phone]
fax: [phone] email: [e-mail]
email: [e-mail]
[e-mail]
Any reproduction of this manual or parts thereof by any means is prohibited.

6 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
1.3 Software License Agreement
This product contains intellectual property, i.e., software programs, that are licensed for use by the
end user/customer (hereinafter “end user”).
This is not a sale of such intellectual property.
The end user shall not copy, disassemble or reverse compile the software program.
THE SOFTWARE PROGRAMS ARE PROVIDED TO THE END USER “AS IS” WITHOUT WAR-
RANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
ENTIRE RISK OF THE QUALITY AND PERFORMANCE OF THE SOFTWARE PROGRAM IS
WITH THE END USER.
MENSOR AND ITS SUPPLIERS SHALL NOT BE HELD TO ANY LIABILITY FOR ANY DAMAGES
SUFFERED OR INCURRED BY THE END USER (INCLUDING, BUT NOT LIMITED TO, GEN-
ERAL, SPECIAL, CONSEQUENTIAL OR INCIDENTAL DAMAGES INCLUDING DAMAGES FOR
LOSS OF BUSINESS PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMA-
TION AND THE LIKE), ARISING FROM OR IN CONNECTION WITH THE DELIVERY, USE OR
PERFORMANCE OF THE SOFTWARE PROGRAM.
1.4 Mensor Service Plus
If you have problems and you don’t nd the answer in this manual, contact Mensor at
1.800.984.4200 (USA only) or 1.512.396.4200 for personal assistance, or at any of the contact ad-
dresses listed on the rear cover of this manual. We are ready to help.
1.4.1 After the Warranty
Mensor’s concern with the performance of this instrument is not limited to the warranty period. We
provide complete repair, calibration and certication services after the warranty for a nominal fee.
1.4.2 Calibration Services
In addition to servicing our own products Mensor can perform a complete pressure calibration
service, up to 20,000 psi, for all of your pressure instruments. This service includes an accredited
calibration.
1.4.3 Accreditations
Mensor is registered to ISO 9001:2008.The calibration program at Mensor is accredited by A2LA,
as complying with both the ISO/IEC 17025:2005 and the ANSI/NCSL Z540-1-1994 standards.
2. Safety Notices

CPT6010 Operating Instructions 7
Digital Pressure Transducer
CPT6010
2.1 Warnings and Caution Notices
Not explosion proof. Installation of this instrument in an area requiring
devices rated as intrinsically safe is not recommended.
Use pressure media compatible with 316 SS. This instrument is not de-
signed for oxygen use.
Caution: ESD PROTECTION REQUIRED. The proper use of grounded work
surfaces and personal wrist straps are required when coming into contact
with exposed circuits (printed circuit boards) to prevent static discharge to
sensitive electronic components.
Avoid excessive overpressure to the sensor! Externally mounted relief
valves to provide overpressure protection are available from Mensor as
optional devices and are highly recommended for very low pressure trans-
ducers.
Warning
!
!
Caution
!
Caution

8 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
NOTES

CPT6010 Operating Instructions 9
Digital Pressure Transducer
CPT6010
3. Product Description
3.1 General Description
The CPT6010 Digital Pressure Transducer (CPT6010) is a self-contained pressure sensing device
that provides high accuracy pressure measurements.This transducer incorporates a low hysteresis
silicon sensor with electronically compensated pressure linearity over the specied temperature
range. Communication with the CPT6010 is over a serial bus, either RS-232 or RS-485.
One end of the CPT6010 has a 1/4” NPT male tting pressure port, and the opposite end has a six
pin power/signal connector (J1) and a #10-32 reference pressure port (for gauge pressure only).
(See Figure 5.2 - Outline drawing)
3.2 Turndowns
The transducer has the capability to include two distinct ranges (turndowns) using a single sensor.
The primary turndown is always the higher range of the transducer. The second turndown has ex-
actly the same performance specications, but at some lower full scale range which is not less than
half the primary turndown range. At powerup the primary turndown is active by default.
3.3 Power Supply
The required 9-18 VDC power enters the CPT6010 via J1. All of the transducer electronics and
communications share a common ground.
3.4 Sensor
The pressure sensor is secured to the transducer case and the 1/4 NPT tting. The case includes a
#10-32 threaded opening which is the reference pressure port for gauge, vacuum or bi-directional
type sensors.
3.5 Circuitry
All of the circuitry for the CPT6010 is included on a single PC board. The combined pressure and
temperature sensor signals are routed to the signal conditioning electronics.
3.6 Serial In/Out Communications
The serial bus is set to either RS-232 or RS-485 at the factory. The bus is a two-way communica-
tion path used to receive commands and return measured pressure values and other transducer
information to the user. This port is also used to transmit calibration adjustments and other user
functions to the CPT6010. Pressure units for each transducer are specied by the customer. Wiring
requirements for the serial port are provided in section 5, Installation, and a list of valid commands
and responses (see Table 6.4.4 - Commands and Queries) is provided in section 6, Operation.

10 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
Figure 3.6 - CPT6010 Block Diagram
9 to18 VDC

CPT6010 Operating Instructions 11
Digital Pressure Transducer
CPT6010
4. Specications
Accuracy specications presented herein are obtained by comparison with primary standards
traceable to the National Institute of Standards and Technology (NIST). These specications are
obtained in accordance with the ISO Guide to the Expression of Uncertainty in Measurement
(GUM). The calibration program at Mensor is accredited by the American Association of Laboratory
Accreditation (A2LA) as complying with both the ISO/IEC 17025:2005 and the ANSI/NCSL Z540-1-
1994 standards.
Mensor reserves the right to change specications without notice.
Total Uncertainty 0.020% FS.
Total Uncertainty (k=2) includes hysteresis, linearity, repeat-
ability, reference standard, drift and temperature eects over
the calibrated range for the calibration interval specied, with
periodic re-zeroing.
Calibration Stability
(after warm-up)
Less than 0.02% FS for 180 days with periodic rezeroing. Zero
and Span may be reset via the serial interface without aecting
linearity.
Calibration Interval 180 days
Calibration Adjustments Zero and Span via the serial interface
Pressure Ranges Absolute: 0 ... 7.5 psia up to 0 ... 6015 psia
Gauge: 0 ... 5 psig up to 0 ... 6000 psig
Bidirectional: -2.5 ... 2.5 psig up to -15 ... 6000 psig
Special Pressure Ranges Vacuum or bi-directional ranges. Metric pressure units also
available.
Pressure Units Selected from a list of 35: psi, inHg @ 0°C and 60°F, inH2O
@ 4°C, 20°C and 60°F, ftH2O @ 4°C, 20°C and 60°F, mTorr,
inSW @ 0°C, ftSW @ 0°C, ATM, bars, mbars, mmH2O @ 4°C,
cmH2O @ 4°C, MH2O @ 4°C, mmHg @ 0°C, cmHg @ 0°C,
Torr, hPa, mPa, kPa, Pa, D/cmsq, G/cmsq, Kg/cmsq, MSW,
OSI, PSF, TSF, TSI, µHg @ 0°C, %fs.
All seawater units are 3.5% salinity.
Resolution From 1 to 10 ppm, depending on measurement units and range
Overpressure Ratings 150% FS or greater, depending on range
Compensated Temperature
Range
15°C to 45°C
Warm-up 10 minutes to rated accuracy

12 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
Reading Rate 50 per second
Communications RS-232 or RS-485. LabVIEW® drivers are available.
(LabVIEW® is a trademark of National Instruments
Corporation.)
Max Transmission 4000 feet (RS-485)
Multi-drop Capacity The maximum number of RS-485 CPT6010 transducers which
can be connected to a single host computer is 31.
Mechanical Shock 5g max
Case Size 1.74” wide x 6.3” long (4.42 x 16 cm), not including pneumatic
and electrical connectors.
Weight Approximately 12 ounces (28.3 grams)
Pressure Media All media compatible with 316L stainless steel.
Fittings Pressure Port: 1/4 inch male NPT
Reference Port: 1/16 inch barb (gauge instruments only).
Power Required 9-18 VDC, 45mA @ 12 VDC
6 pin Bendix connector #PT02E-10-6P
Options Relief valves - up to 1000 psig
Non-standard ranges

CPT6010 Operating Instructions 13
Digital Pressure Transducer
CPT6010
5. Installation
5.1 Unpacking the instrument
In addition to functional testing, each unit is inspected for appearance prior to leaving the factory.
Upon receipt, please examine the transducer for shipping damage. Report any apparent damage
to the carrier immediately.
In addition to this manual and password information (les on USB drive), you should have:
• One CPT6010 Digital Pressure Transducer in protective netting;
• One six-pin mating Bendix electrical connector if power/comm cable accessory not ordered;
• Any accessories ordered;
• An envelope containing a Calibration Certicate.
Note: The software utility CD was supplied with this manual prior to 2/2014 but is now downloaded
from the Mensor website (see Section 7.2, “Equipment”).
5.2 Dimensions
Figure 5.2 - Outline drawing, CPT6010
5.3 Conguration
A typical system will consist of an IBM-PC compatible computer with installed driver software,
one or more CPT6010’s, a DC voltage power supply, and the interconnecting cables. The driver
software can be any program congured to operate the appropriate serial interface. Up to 31
CPT6010’s can be connected in parallel using RS-485. Refer to Figure 5.6.3 for an illustration of
two alternate RS-485 wiring arrangements, including multiple CPT6010 operation.
5.4 Mounting
The CPT6010 can be set up in any orientation since the pressure sensor is relatively insensitive to
tilt and vibration. However, excessive motor or machinery vibration of the mounting surface should
be avoided to further ensure stability and accuracy. For the greatest accuracy on transducers with a
full scale range of less than 15 psi, set CPT6010 zero while it is oriented in its operational position.
5.5 Pressure Connections

14 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
The pressure to be measured is applied to the 1/4 inch NPT tting. A 10-32 tapped opening on the
opposite end is used as the reference port for gauge pressure. This port is normally left open to
atmosphere, but it can be connected to another source for a reference pressure.
Use either Loctite® Hydraulic Sealant or fresh teon tape on the threads of the male pipe ttings
when making up pressure connections. The integrity of the seal to the pressure port is important
since even microscopic leaks can cause errors in pressure measurements.
!
Caution
Do not install by grabbing the case and turning it with a wrench or pliers.
Use the wrench ats near the pipe threads. Wrench size is 7/8 inch.
5.6 Electrical Connections
5.6.1 Connector J1 Wiring
Power and signals are applied to J1, a circular 6 pin male connector. A positive power supply
voltage is supplied to pin A, and ground (power and signal common) is connected to pin B.The
CPT6010 is protected against power input reversal. A mating connector (Bendix #PT06E-10-6S
SR) is shipped with the transducer. Wiring between the host and J1 is described by Figures 5.6.2
and 5.6.3.
5.6.2 RS-232 Operation
For RS-232 serial port operation, connect the CPT6010 to the host computer per Figure 5.6.2 No-
tice that the host TRANSMIT line is connected to the CPT6010 RECEIVE line (TX to RX), and vice
versa. One limitation of the RS-232 bus is that a host can support only one instrument. See section
5.6.3, RS-485 Operation, for multiple CPT6010 operation.
Note: Connectors are female, shown from the wired end.
Figure 5.6.2 - RS-232 Hookup
5.6.3 RS-485 Operation

CPT6010 Operating Instructions 15
Digital Pressure Transducer
CPT6010
For RS-485 serial operation, connect the host computer to the CPT6010 the diagram shown in
Figure 5.6.3. Notice that the host TRANSMIT lines are connected to the CPT6010 RECEIVE lines,
TA to RA, TB to RB, and so on.
If only one RS-485 CPT6010 will be connected to the system, disregard the wiring to “CPT #1” and
“CPT #2” in the illustrations. Instead, wire the computer directly to the “CPT #31” by the four-wire
method.
To connect multiple RS-485 CPT6010’s to a single host, use the full multi-drop wiring shown in Fig-
ure 5.6.3. Only full duplex (4-wire) connection is recommended. In the conguration, one computer
can communicate with up to 31 CPT6010’s without a repeater, but each CPT6010 in the system
must have a unique address. The signal is simultaneously distributed to each transducer connect-
ed to the parallel path. Each CPT6010 responds only to commands or queries directed to its own
address. Removal of one or more CPT6010’s from the line has no eect on the remaining devices.
Terminating resistor examples are shown and should be determined by the end user when cabling
extremes are required. Resistor values are selected to match the characteristic impedance of the
transmission line, typically 100 to 120 ohms.
Due to the nature of the various RS-485 converters available there may be
communication issues. We have determined that our devices work with the
ACCES I/O PRODUCTS devices. At this time we are not in a position to com-
ment on any other make of RS-485 converters and their suitability for use
with our products.
i
Notice

16 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
Figure 5.6.3 - RS-485 Cabling

CPT6010 Operating Instructions 17
Digital Pressure Transducer
CPT6010
6. Operation
The pressure to be measured is applied to the 1/4 NPT tting on the CPT6010.
!
Caution
Avoid excessive overpressure to the sensor! Externally mounted relief
valves to provide overpressure protection are available from Mensor as
optional devices, and are highly recommended for very low pressure
transducers.
A CPT6010 samples the pressure every 20 milliseconds (50 Hz).
User programmable exponential ltering is applied to pressure readings in order to minimize at or
near static pressure noise. The lter value can range from 0 (lter OFF) to 99 (maximum ltering).
For any positive lter value, the lter is disabled when the pressure change between consecutive
readings is greater than 0.02% full scale. However, each pressure change of 0.02% FS, or less, be-
tween consecutive readings will apply the exponential lter to the output pressure value to smooth
out the readings.
The user can reset the zero and span values via the serial port in order to calibrate the instrument,
or the user can change any of several other operating values. The user can also query the device
for its current pressure reading, or to nd the current settings for other parameters.
The serial port is set at the factory for either RS-232 or for RS-485 serial operation according to the
customer’s instructions. This section of the manual provides information on the serial port congu-
ration, explains the command conventions used in this manual, and lists the common commands
and queries which are recognized by the CPT6010.
6.1 Multiple Turndown Devices
The availability of two dierent turndown ranges in one device has many obvious benets, but
certain issues should be noted for application of devices with multiple ranges. An important factor
to remember is that the two ranges are completely discrete. Consequently, any and all parameters
can be set to dierent values between the two turndown ranges. The independence of the two
ranges has a specic impact on application of the transducer that is detailed below and in section
6.3, CPT6010 Address.
6.1.1 Filter Eects of Multiple Turndowns
An area of concern when using devices with multiple turndowns is the eect of the exponential
lter on the reading output. In the case that a user is emulating an auto-ranging scheme by quickly
switching between turndown ranges of one device, the exponential lter can skew the reading out-
put of the device immediately after a switch is made. The reason for this skewing is the persistence
of previous pressure samples in the reading buer and their use in the ltering scheme.

18 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
The lter equation for the transducer is as follows where FL is set to 90: If the change in pressure
reading is less than 0.02% of the last pressure reading sampled at a 20 mS rate, then the pressure
reading = (last ltered pressure * 90%) + (current sampled pressure * 10%). Otherwise the pres-
sure reading is equal to the current sampled pressure. Default setting is 90% ltering.
Consequently, the readings from the previous active turndown in the reading buer of the device
aect the current reading. The amount the new reading is aected is a function of the size of the
lter percentage setting of the active turndown. The largest oset that will be reported by the newly
active turndown is 0.02% FS of the current range. In applications where readings must not slew in
immediately after a turndown switch is made, it is advisable to set the lter to zero or to program a
delay before the new turndown is read.
6.2 Serial Port Conguration
Unless otherwise requested by the customer, the CPT6010 serial ports are set at the factory to the
default values listed in the following table.
Table 6.2 - Serial Port Settings
Item Value
Type RS-232
Address 1
Baud 9600
Data Bits 8
Parity None
Stop Bits 1
6.3 CPT6010 Address
Each CPT6010 is assigned address “1” at the factory. In a multiple CPT6010 system each trans-
ducer must have a unique address. Valid addresses are 0 through 9 and A through Z (upper and
lower case are interpreted the same).
6.3.1 Addressing Devices with two Turndowns
A circumstance that must be taken into consideration by users of CPT6010’s with two turndowns is
the possible use of dierent addresses on separate turndowns of a single transducer. For example,
if the primary turndown is set to address X and the second turndown is set to address Y, if a user
switches from turndown one, and attempts to address the secondary turndown with address X, the
secondary range of the device will not respond.The simplest solution to this problem is to set both
turndown addresses to the same value. Alternately, if the device is not being used in a multi-drop
application, the user can simply address both ranges with the wildcard address character (see

CPT6010 Operating Instructions 19
Digital Pressure Transducer
CPT6010
6.4.1, Wildcard Address Operator) in the event that the application requires dierent addresses
for the respective turndowns. One example of an application of this sort is if a user requires dier-
entiation of the reading output. Because the response string of the transducer when queried for a
pressure reading is always started with the address of the active turndown range, a user can switch
between turndowns using the wildcard address string and still have indication of which turndown is
reporting the data.
6.4 Communication Syntax and Command Conventions
All commands and responses are in ASCII characters; lower and upper case are interpreted the
same. Every command or query begins with the pound symbol (#).The question mark (?) and
decimal point (.) characters are signicant to the CPT6010. All other punctuation characters are
ignored. Some commands require a password string. A carriage return (<cr>) or linefeed (<lf>)
should terminate each command or query.
6.4.1 Wildcard Address Operator (*)
In addition to the 36 unique addresses available, an asterisk (*) functions as a wildcard address
operator. However, this wildcard must not be used in queries if more than one transducer is con-
nected to a host.
One use for the wildcard address could be when a CPT6010 is pulled out of a multi-drop setup and
sent to a calibration facility for recertication. The calibration technician can communicate with the
device using the wildcard address without learning or changing its assigned address.
6.4.2 Password Protection
Certain commands require a password to be sent before a setting is changed. The password is
only good for one command, so the password string must be sent immediately before any pass-
word protected command string. The form of the password string is described in Table 6.4.4. How-
ever, for calibration protection, the actual password has been replaced with PW in the command
string example. See the Password card le for the actual password string to be used in place of PW.
6.4.3 Response String Format
The CPT6010 will return an R to indicate that it has received a command or password rather than
a query. When programming communication with the CPT6010, it is advisable to look for the R
response before sending additional commands or queries.
The full command word is shown in Table 6.4.4 in all capital letters. Other conventions used to
describe commands are shown in Table 6.4.3.
Table 6.4.3 - Command Conventions

20 CPT6010 Operating Instructions
Digital Pressure Transducer
CPT6010
Convention Description
X Address (single character 0 through 9 or A through Z; case insensitive)
* Wildcard address operator
? Query operator
<sp> Space ( )
PW Password; insert password in place of PW (See password card on USB
drive; case insensitive)
n One character placeholder for digit or decimal point
n...n Variable length eld
R Ready response
<cr> Carriage return
<lf> Linefeed
6.4.4 Commands and Queries
i
Notice
Each command that changes a parameter is volatile until the SAVE com-
mand is issued.
Table 6.4.4 - Command Set
Pass-
word
Protect
Command
or Query
Command String Return String Description
No ? #X?<cr> X<sp>nnnnnnnnnn<cr>
<lf>
Basic query to return pressure
readings.
No A #XA<sp>n<cr> R Sets address of sensor to 0-9
or A-Z.
No B? #XB?<cr> X<sp>B<sp>n<cr><lf> Returns the turndown, cal ag
No DC? #XDC?<cr> X<sp>DC<sp>nnnnnn
<cr><lf>
Returns the date of calibration
where nnnnnn is mmddyy.
Ye s DC #XDC<sp>nnnnn
n<cr>
R Loads the date of calibration
where nnnnnn is mmddyy.
No FL? #XFL?<cr> X<sp>FL<sp>nn<cr>
<lf>
Returns the lter – it is the per-
centage of old reading added
to new reading: 0-99.
Ye s FL #XFL<sp>nn<cr> R Sets the lter percentage.
No FS? #XFS?<cr> X<sp>FS<sp>nnnnn<cr>
<lf>
Returns the %FS accuracy.