Martel Electronics 1919222, 1919208, 1919448, 1919214, 1919211 User manual

BetaGauge PI & PI PRO

Digital Pressure Test Gauge

User Reference Manual

This

document

includes information

for both the CSA and

CSA/ATEX certified

versions of the
BetaGauge PI.

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1

1. Introduction

The BetaGauge PI combines the high accuracy of digital electronics
with the convenience and ease of use of an analog test gauge.
Accurate to ± 0.05% FS, the BetaGauge PI can be used as a
calibration reference, or in any application where high accuracy
pressure measurement is required.

Many user configurable functions have been designed into the
BetaGauge PI including sampling rate, TARE, damping, auto shut off,
and min-max. Once the gauge is configured, settings can be locked
and password protected to prevent unauthorized changes to
configuration.

1.2 Standard Equipment

Check to see that your BetaGauge PI has arrived intact. Batteries are
factory installed unless you have purchased the optional 24V powered
version, in which case batteries are not supplied or installed. Save the
packing materials at least until you have verified that there is no
concealed damage.

1.3 Safety information

A Warning identifies conditions and actions that pose hazard(s) to the
user; a Caution identifies conditions and actions that may damage the
Calibrator or the equipment under test.

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2

Symbols Used

The following table lists the International Electrical Symbols. Some or all
of these symbols may be used on the instrument or in this manual.

Symbol Description

Power OFF

Power ON

Earth ground

Risk of Danger. Important information. Refer to manual.

Battery

Hazardous Voltage

Conforms to ATEX requirements

Certified by CSA as conforming to relevant Canadian and USA standards

Conforms to relevant European Union directives.

Wheeled bin, conforms to EC directive 2002/96/EC

Hazard Location Information/Approvals

Ex Hazardous Areas

An Ex-hazardous area as used in this manual refers to an area made
hazardous by the potential presence of flammable or explosive vapors.
These areas are also referred to as hazardous locations, see NFPA 70
Article 500.

®

LR110460

Class I, Div. 2, Groups A-D

WARNING

Only gauges powered by batteries are approved for use in hazardous
areas. 24V versions are not approved for hazardous use.

II 3 G Ex nA IIB T6
KEMA 06ATEX0014 X
Ta=–10°C... +55°C

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Special Conditions for Safe Use:

Misuse

Should the BetaGauge PI be exposed to overpressure or sudden
physical shock (i.e. being dropped) it should be examined for any
damage that may cause a safety concern. If in doubt please return the
unit for evaluation to Martel Electronics. Please refer to the Customer
Service Section for contact information.

WARNING

The Beta Gauge PI is not intended for use with flammable substances
and is intended for installation only in locations providing adequate
protection against the entry of solid foreign objects or water capable of
impairing safety.

Caution

To avoid possible damage to calibrator or to equipment under test:

• If the message changes to "OL" the range limit is exceeded and the
pressure source must immediately be removed from the BetaGauge
PI to prevent damage to the pressure transducer inside.

• Maximum torque allowed is 13,5 Nm = 10 ftlbs. NEVER exceed the
torque allowed.

2. BetaGauge PI Display and Controls

3. Operation

Power: The standard BetaGauge PI is supplied with 3 AA batteries
installed. If you purchased the optional 24Volt powered version,

3

Pressure display

Engineering Units

0 - 100% bar graph

Selects an action in
configuration.
Also turns the
back-light on/off

Turns Power on/off

Enters set-up and

configuration menus

Zeros the display,

Scrolls forward through

menu displays

Recalls min and max

readings.

Scrolls backwards

through menu displays

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batteries are not installed. Connect a 24V power supply to the terminal
block on the rear of the gauge, noting proper polarity.
Do not install batteries when external power will be used.

Push the power button momentarily to turn the unit on. Push it again
to turn it off.

Set-up and configuration:

Push the CONFIG button to access the user-settable functions on the
gauge. Each time the CONFIG button is pressed; the display advances
to the next function. Once a function has been set, press ENTER to
exit the configuration menu, or CONFIG to continue with further
configuration. In order, the configuration menu and operation is as
follows:

1. Engineering Units set. The unit is shipped configured to display

PSI. By pressing the ▲ and ▼ (ZERO and MAX/MIN) keys you
can scroll forward and backwards through the 18 standard
engineering units plus a one custom unit/scale. When the desired
unit is displayed, press ENTER or CONFIG. Pressure will now be
displayed in the chosen engineering units.

See the Specifications section of this manual for a list of available
engineering units. See the Supervisory Mode section for details on
setting up custom units.

2. Set Auto Off. The auto-shut off can be set in 1 minute increments

from 1 to 30 minutes or “off” (continuous operation). The unit is
shipped set for 30 minutes. Use the ▲ and ▼ keys to set the
desired interval. The “off” setting is at the low end of the choices,
below 1 minute.

3. Display battery voltage. Actual voltage and a percent of life

bargraph indicate battery condition

4. Display actual temperature. The BetaGauge PI is temperature

compensated, this displays the temperature measured by the
internal sensor. The value can be set to degrees F or degrees C
using the arrow keys.

5. Set damping. Choices are “on” and “off” set with the ▲ and ▼

keys. Turning damping on will smooth readings from pulsating
pressure sources.

6. Set sample rate: This determines how often pressure is sampled

and the display is updated. Choices are 0.5, 1, 3, and 10
samples/second. Note that 10/sec provides the fastest response
time.

7. Set TARE. This allows you to set a constant offset value, which is

then subtracted from the measured pressure. For example if a
TARE is set at 30 PSI, and the measured pressure is 37 PSI, the
displayed value will be 7 PSI.
A pressure of 27 PSI would be displayed as –3 PSI.

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The tare value is set manually with the ▲ and ▼ keys, and is
based on the engineering units and resolution selected for display.
TARE value can be set to the maximum range of the gauge.

The bar graph will always display the actual pressure based on the
full range of the gauge regardless of the tare setting. This is done
for safety to insure that even with a “0” reading that pressure is
being applied to the gauge.

8. Function Lock: Access to each of the settable parameters above

can be turned “off” once set, to prevent unauthorized changes to
configuration. This is accomplished through a password protected
“supervisory mode”. Press ENTER to access the supervisory
mode, or CONFIG to return to normal operation.

4. Supervisory Mode

Press ENTER when “FUnC LOCK” is displayed, 0PWRD will be
displayed on the gauge. The password to enter supervisory mode is
101, set using the ▲ and ▼ keys. Holding a key continuously will
cause the display to advance more quickly for faster setting. The
password is factory set and cannot be changed

1. Your BetaGauge PI is shipped from the factory with all setting

access “unlocked” or available to be changed.

2. In supervisory mode each of the parameters can be locked or

unlocked using the ▲ and ▼ keys. Select LOC (lock) for those
parameters you do not want to be accessible, and UnLOC (unlock)
for those can be accessed.

3. In order, the functions that can be unlocked, locked or accessed

are:

• Zero function (enable/disable)

• Set pressure units (enable/disable)

• Auto shutdown adjustment (enable/disable)

• Damping settings (enable/disable)

• Sample rate setting (enable/disable)

• Tare setting (enable/disable)

• Custom engineering units (set scale factor)

4. Use the CONFIG key to scroll through the above choices, and the

▲ and ▼ keys to lock and unlock features. Press CONFIG to
continue scrolling through the parameters, pressing ENTER at any
point saves your settings and returns the gauge to normal
operation.

When a function is “locked, it cannot be accessed or changed
from its current state. To change a locked function, enter the
supervisory mode, and unlock the function. Once it is changed,
you may enter supervisory mode to lock access again.

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5. Setting a custom engineering unit or scale: The last menu choice in

supervisory mode is SET FACTR. This allows you to set a multiplier
factor from 0.001 to 100, creating a custom scale. The set factor will
be multiplied by the PSI measured, the result will be displayed.

For example: 40 PSI is the equivalent of 1000 lbs of product in a
tank. You want to display the product weight , using a 100 PSI
gauge. By setting a factor of 25, a 40 PSI pressure would display
as 1000 (40 x 25). The engineering unit displayed on the
BetaGauge PI will be “Cust”.

5. Normal Operation

Turning the backlight on and off: Press the ENTER button.

Zeroing the display: Press and hold the ZERO button.

Note: For absolute versions of the gauge pressing the zero key will
prompt the user to enter a barometric reference pressure. Use the ▲
and ▼ arrow to adjust the reading as required. Then press ENTER.

MAX/MIN: The BetaGauge PI stores minimum and maximum
pressure values in memory. Pressing the MAX/MIN button once will
display the minimum pressure from memory. Pressing the MAX/MIN
button again will display the maximum pressure from memory. After
about 2 seconds, the gauge returns to normal (live display) operation.
To clear the MAX/MIN memory registers, press and hold the MAX/MIN
button for 2 or more seconds until “CLr” is displayed.

The analog bar graph at the bottom of the display indicates the applied
pressure level relative to the full range of the gauge. Keep in mind that
if a TARE value has been programmed into the gauge, the displayed
pressure will not reflect the true pressure applied.

6. Changing the Batteries

WARNING

Explosion hazard

Batteries must only be changed in an area known

to be non-hazardous.

BetaGauge PI

Grasp the face ring on the BetaGauge PI, turn it approximately ¼ turn
counterclockwise and remove. Note: For ATEX certified versions
remove the two screws on the rear of the case to release the front
plate. The face of the gauge can now be lifted to expose the battery
holder. Take off the battery hold clip and remove the batteries. Install
three AA alkaline batteries noting proper polarity. Note: Use ONLY AA
alkaline batteries and be sure to reinstall the battery holder retaining

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clip. Reassemble the case making certain that the face is properly
oriented.

If you purchased the optional 24 Volt powered version, the terminals for
power input are located on the rear of the gauge. To apply power
simply connect 24 volts to the rear terminal block taking care to
observe proper polarity.

BetaGauge PI PRO

Loosen the captive screw on the battery door, then remove the battery
door to expose the 3 AA batteries. Replace the batteries as required
and then reinstall the battery door and teighten the captive screw.

WARNING

Gauges ordered with the external power option will not come with
batteries installed. Batteries MUST NOT be installed when
operating on external power. External power option gauges are not
approved for hazardous location use.

Battery life

Battery life is about 1500 hours (60 days) of continuous use with the
backlight off. With intermittent use, batteries could last a year or more.
There is a low battery icon in the upper left of the display. It will appear
when battery level is low. Replace batteries per recommendations
found in the specifications section of this manual.

RS-232 Interface

An RS-232 interface is standard on the BetaGauge PI. Serial
communication can be used for configuration, calibration, and to
transfer measurement data from the gauge. For detailed specifications
on the interface and software communication, see pages 14 and 15 in
this manual.

WARNING

The RS-232 interface must not be used in hazardous areas.

7. Cleaning

To clean the BetaGauge PI use a cloth with a mild cleaning solution.

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8. Specifications

Available Input Ranges

See page 13 for a table of available ranges in PSI plus equivalent
ranges and resolution for all engineering units

Accuracy

Positive Pressure: ±0.05% FS (all ranges except as noted)

10” WC (25mbar) ±0.1% FS

1.0 PSI (70 mbar) ±0.1% FS

Vacuum: ±0.25% FS (500 PSI gauge ranges and below)

0.1% FS for 15/30 PSI compound/vacuum versions

For gauges with full scale ranges equal to, or less than 30 psi (2 BAR),
vacuum operation is limited to -5psi (-350 mBAR). The exceptions are
the 2 compound ranges; -15 to 15 PSI and -15 to 30 PSI.

Over Pressure Protection:

See table of Ranges and Resolutions, page 13.

Temperature Compensation

15°C to 35°C (59°F to 95°F) to rated accuracy

Note: For temperatures from -10°C to 15°C and 35°C to 55°C, add

0.003% F.S./°C

Standard Engineering Units

See Table of Ranges and Resolutions, page 13, plus

One custom unit (user programmable)

Media Compatibility

All ranges except 1 PSI and compound ranges:

Liquids and gases compatible with 316 stainless steel

1 PSI and compound ranges: clean, dry, non-corrosive gas

Environmental

Operating Temperature -10 °C to +55 °C (14°F to 131°F)

Storage -20 °C to +70 °C (-4 °F to +158 °F)

Humidity 10% to 95% RH Non-condensing

Pollution Degree II

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Mechanical

Dimensions 4.5” (diameter) x 2.2” (depth) x 5” (height)

(11.4cm x 5.6cm x 12.7cm) (PI PRO depth is 1.5” or 3.7cm)

Pressure Connection: ¼” NPT Male

Housing: Stainless steel, meets NEMA 4/IP65 (PI PRO: cast Z

NAL)

Display

5-1/2 Digits, 0.65” (16.53 mm) high

20-Segment bar graph, 0 to 100%

Power

Battery three (3), size AA alkaline batteries

Battery Life 1,500 hours without backlight (continuous on)

2,000 hours at slow sample rate

Low Battery Indicator icon is displayed near the end of battery life

Appendix 1: BetaGauge PI Calibration Procedure

Overview

Calibration adjustment of the BetaGauge PI is performed electronically
via internal software with the case closed. There are no mechanical
adjustments; all calibration commands and adjustments are done via
the keypad, using the display to guide the user through the calibration
process. Note that absolute range gauges require a factory calibration
and must be returned to the factory or an authorized service center.

Eight calibration points are used in the adjustment program, working
from full scale to zero at pressures equaling 100%, 87.5%, 75%, 62.5%,
50%, 37.5%, 25%, 12.5%, and 0% of full scale plus vacuum.

Note: This is an ambient temperature calibration, and should be
performed at an ambient temperature of 23° C ± 3° C (72° F ± 5° F).
Calibration outside this temperature range will invalidate the
temperature compensation program in the BetaGauge PI.

Calibration Interval

You should check performance of the BetaGauge PI at the interval
required by your calibration program. We recommend adjustment
when measurement deviates by more than 75% of the specified
accuracy, or 0.04%

Test Equipment

Verification and calibration of the BetaGauge PI requires pressure
and/or vacuum standards able to produce and indicate pressures from

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vacuum to the full-scale range of the unit under test. In order to
maintain the specified accuracy of the BetaGauge PI, standards should
have a TUR of 4:1 or better.

Connections:

The BetaGauge PI uses a 1/4 NPT male connection in the pressure
input port. Various adapters may or may not be needed to connect to
the pressure standard. Always make sure the hose, tubing, and fittings
etc have a rated working pressure at or above the pressure of the unit.
Also it is important that there be no leaks when performing calibration;
use Teflon tape where appropriate.

Entering Calibration Mode:

After you have made your connections, turn the power on while
holding the CONFIG key. Use the arrow keys to enter the password.
The password is 101. If you have entered calibration mode correctly
the display should look as shown below. The pressure value displayed
will be the full-scale value of the gauge.

Procedure:

Screens shown in this manual represent the displays shown with a 500
psi Gauge. The BetaGauge PI will prompt the technician for the
appropriate pressure at each calibration point.

Use the Pressure Standard to output 500.00 psi (100%). After the
output has stabilized, press the ENTER key to continue. As the unit
takes readings, the screen will show ———-. When the readings are
complete the screen should look as shown in the illustration that
follows.

Use the Pressure Standard to output 437.50 psi (87.5%). After the
output has stabilized, press the ENTER key to continue. As the unit
takes readings, the screen will show ———-. When the readings are
complete the screen should look as shown below.

PSI

437.50

CAL MODE

PSI

500.00

CAL MODE

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Use the Pressure Standard to output 375.00 psi (75%). After the
output has stabilized, press the ENTER key to continue. As the unit
takes readings, the screen will show ———-. When the readings are
complete the screen should look as shown below.

Use the Pressure Standard to output 312.50 psi (62.5%). After the
output has stabilized, press the ENTER key to continue. As the unit
takes readings, the screen will show ———-. When the readings are
complete the screen should look as shown below.

Use the Pressure Standard to output 250.00 psi (50%). After the
output has stabilized, press the ENTER key to continue. As the unit
takes readings, the screen will show ———-. When the readings are
complete the screen should look as shown below.

Use the Pressure Standard to output 187.50 psi (37.5%). After the
output has stabilized, press the ENTER key to continue. As the unit
takes readings, the screen will show ———-. When the readings are
complete the screen should look as shown below.

11

PSI

375.00

CAL MODE

PSI

312.50

CAL MODE

PSI

250.00

CAL MODE

PSI

187.50

CAL MODE

PSI

125.00

CAL MODE

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Use the Pressure Standard to output 125.00 psi (25%). After the
output has stabilized, press the ENTER key to continue. As the unit
takes readings, the screen will show ———-. When the readings are
complete the screen should look as shown below.

Use the Pressure Standard to output 62.50 psi (12.5%). After the
output has stabilized, press the ENTER key to continue. As the unit
takes readings, the screen will show ———-. When the readings are
complete the screen should look as shown below.

Use the Pressure Standard to output 0.00 psi. After the output has
stabilized, press the ENTER key to continue. As the unit takes
readings, the screen will show ———-. When the readings are
complete the screen should look as shown below.

Note: Only some ranges use vacuum calibration. If your gauge is not
one, than this step will be automatically skipped and calibration will be
complete.

Use the Pressure Standard to output -12.00 psi. After the output has
stabilized, press the ENTER key to continue. As the unit takes
readings, the screen will show ———-. When the readings are
complete the unit will reset and power up in normal mode.

PSI

-12.00

CAL MODE

PSI

0.00

CAL MODE

PSI

62.50

CAL MODE

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Pressure range 0.4 1 15 30 15 30 100 300 500 1000 2000 3000 5000 10000

gauge gauge gauge ** gauge **

Range Type compound compound compound compound absolute absolute absolute absolute gauge ** gauge gauge gauge gauge gauge

Burst Pressure 3 5 90 90 500 500 1000 2000 2000 10000 10000 10000 10000 15000

Proof Pressure 1 3 60 60 60 60 200 600 1000 2000 3000 6000 10000 15000

Engineering Factor

Unit

psi 1 0.4000 1.0000 15.000 30.000 15.000 30.000 100.00 300.00 500.00 1000.0 2000.0 3000.0 5000.0 10000

bar 0.06894757 0.0276 0.0689 1.0342 2.0684 1.0342 2.0684 6.8948 20.684 34.474 68.948 137.90 206.84 344.74 689.48

mbar 68.94757 27.579 68.948 1034.2 2068.4 1034.2 2068.4 6894.8 20684 34474 68948 * * * *

kPa 6.894757 2.7579 6.8948 103.42 206.84 103.42 206.84 689.48 2068.4 3447.4 6894.8 13790 20684 34474 68948

Mpa 0.006894757 0.0028 0.0069 0.1034 0.2068 0.1034 0.2068 0.6895 2.0684 3.4474 6.8948 13.790 20.684 34.474 68.948

kg/cm2 0.07030697 0.0281 0.0703 1.0546 2.1092 1.0546 2.1092 7.0307 21.092 35.153 70.307 140.61 210.92 351.53 703.07

mmHg @ 0°C 51.71507 20.686 51.715 775.73 1551.5 775.73 1551.5 5171.5 15515 25858 51715 * * * *

inHg @ 0°C 2.03603 0.8144 2.0360 30.540 61.081 30.540 61.081 203.60 610.81 1018.0 2036.0 4072.1 6108.1 10180 20360

cmH2O @ 4°C 70.3089 28.124 70.309 1054.6 2109.3 1054.6 2109.3 7030.9 21093 35154 70309 * * * *

cmH2O @ 20°C 70.4336 28.173 70.434 1056.5 2113.0 1056.5 2113.0 7043.4 21130 35217 70434 * * * *

mmH2O @ 4°C 703.089 281.24 703.09 10546 21093 10546 21093 70309 * * * * * * *

mmH2O @ 20°C 704.336 281.73 704.34 10565 21130 10565 21130 70434 * * * * * * *

mH2O @ 4°C 0.703089 0.2812 0.7031 10.546 21.093 10.546 21.093 70.309 210.93 351.54 703.09 1406.2 2109.3 3515.4 7030.9

mH2O @ 20°C 0.704336 0.2817 0.7043 10.565 21.130 10.565 21.130 70.434 211.30 352.17 704.34 1408.7 2113.0 3521.7 7043.4

inH2O @ 4°C 27.68067 11.072 27.681 415.21 830.42 415.21 830.42 2768.1 8304.2 13840 27681 55361 83042 * *

inH2O @ 20°C 27.72977 11.092 27.730 415.95 831.89 415.95 831.89 2773.0 8318.9 13865 27730 55460 83189 * *

inH2O @ 60°F 27.70759 11.083 27.708 415.61 831.23 415.61 831.23 2770.8 8312.3 13854 27708 55415 83123 * *

ftH2O @ 4°C 2.306726 0.9227 2.3067 34.601 69.202 34.601 69.202 230.67 692.02 1153.4 2306.7 4613.5 6920.2 11534 23067

ftH2O @ 20°C 2.310814 0.9243 2.3108 34.662 69.324 34.662 69.324 231.08 693.24 1155.4 2310.8 4621.6 6932.4 11554 23108

ftH2O @ 60°F 2.308966 0.9236 2.3090 34.634 69.269 34.634 69.269 230.90 692.69 1154.5 2309.0 4617.9 6926.9 11545 23090

ft Sea Water 2.24719101 0.8989 2.2472 33.708 67.416 33.708 67.416 224.72 674.16 1123.6 2247.2 4494.4 6741.6 11236 22472

m Sea Water 0.68494382 0.2740 0.6849 10.274 20.548 10.274 20.548 68.494 205.48 342.47 684.94 1369.9 2054.8 3424.7 6849.4

Torr 51.71507 20.686 51.715 775.73 1551.5 775.73 1551.5 5171.5 15515 25858 51715 * * * *

1. Cells noted with * will not be displayed due to limitations on display resolution. In all cases, resolution is limited to 100,000 counts.

2. Ranges denoted with ** can also be used in limited compound applications to -12psi (-0.8bar)

BetaGauge PI Ranges and Resolution

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9. BetaGauge PI Serial Interface Instructions

Initiating Communication

The terminal communications can be setup using terminal
communication software on a PC. The terminal settings need to be set
as follows:

• Bits per second: 9600

• Data bits: 8

• Parity: None

• Stop bits: 1

• Flow control: None

• Local echo on

List of Commands

Command Description

CAL_START Puts the calibrator in calibration mode

*CLS Clears the error queue.

FAULT? Returns an error code from the error queue

*IDN? Identification query. Returns the manufacturer, model number,

and firmware revision level of the Calibrator.

TARE Tares the offset pressure of the reading on the calibrator

TARE? Returns the current tare value

PRES_UNIT? Returns the pressure unit for the upper display.

PRES_UNIT Sets the pressure unit for the display

ZERO_MEAS Zeros pressure of the calibrator

ZERO_MEAS? Returns the current zero offset value

MINMAX_RST Resets the minimum and maximum recorded values.

MIN? Returns the minimum recorded value

MAX? Returns the maximum recorded value

HC_OFF Turns unit off

HC_DFLT Sets auto off defaults

TEMP? Returns temperature in the chosen units

HC_COMP_OFF Turns temperature compensation off.

HC_COMP_ON Turns temperature compensation on.

HC_COMP? Returns state of temperature compensation.

HC_RD_2410? Return 2410 ADC counts.

HC_SI_OFF Turns SI mode off.

HC_SI_ON Turns SI mode on.

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CAL_STORE Stores calibration data.

HC_AUTO_OFF Turns auto shutdown off

HC_AUTO_ON Turns auto shutdown on

CUST_MULT? Sets the multiplier for the custom unit type

STREAM_OFF Turns streaming data off

STREAM_ON Turns streaming data on

HC_TEMP? Same as TEMP?

VAL? Returns the measured pressure value in selected units

HC_CMD_LIST Prints out a command list

TEMP_UNIT Used to set temperature unit

TEMP_UNIT? Returns temperature unit

Parameter Units

Units Meaning

Psi Pressure in pounds per square-inch

Bar Pressure in bars

mBar Pressure in millibars

Kg/cm2 Pressure in kilograms per centimeter squared

InH2O4C Pressure in inches of water at 4°C

InH2O20C Pressure in inches of water at 20°C

InH2O60F Pressure in inches of water at 60°F

mH2O4C Pressure in meters of water at 4°C

MH2O20C Pressure in meters of water at 20°C

cmH2O4C Pressure in centimeters of water at 4°C

cmH2O4C Pressure in centimeters of water at 20°C

ftH2O4C Pressure in feet of water at 4°C

ftH2O20C Pressure in feet of water at 20°C

ftH2O60F Pressure in feet of water at 60°F

Inhg0C Pressure in inches of mercury at 0°C

mmhg0C Pressure in millimeters of mercury at 0°C

kpal Pressure in kilopascals

Far Temperature in Farenhiet

Cel Temperature in Celcius

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Error Codes

Error Description

101 A non-numeric entry was received where it should be a

numeric entry

102 Too many significant digits entered

103 Invalid units or parameter value received

105 Entry is above the upper limit of the allowable range

106 Entry is below the lower limit of the allowable range

108 A required command parameter was missing

109 An invalid pressure unit was received

117 An unknown command was received

120 The serial input buffer overflowed

121 Too many entries in the command line

122 Pressure module not connected

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10. Warranty

Martel Electronics Corporation warrants all products against material
defects and workmanship for a period of twelve (12) months after the
date of shipment. Problems or defects that arise from misuse or abuse

damage as a result of poor return packaging. Out of warranty repairs
and recalibration will be subject to specific charges. Under no
circumstances will Martel Electronics be liable for any device or
circumstance beyond the value of the product.

WARNING

Substitution of components may impair suitability

for hazardous locations.

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