Ametek APC Operating Manual

AMETEK JOFRA APC

Advanced Pressure Calibrator

Reference Manual

1. Introduction

The Ametek APC is a high accuracy, full function pressure calibrator. The
calibrator includes the following features and functions:

• Dual display. The upper portion of the display is used to read pressure in
various units. The lower portion of the display is primarily used to read
current (up to 24 mA).

• Pressure can be read from an internal sensor or an external module (APM).

• Switch test functionality uses an higher speed pressure update rate for
superior performance.

• Current can be read with or without loop power.

• An RS232 interface allows complete “hands off” remote control monitoring.

The Ametek APC is well suited for various applications including calibration of
gauges, pressure switches, safety valves, and P/I transmitters.

The APC is available in the following ranges:
10 psi / 0.7 bar 1,000 psi / 70 bar

30 psi / 2 bar 3,000 psi / 200 bar
200 psi / 15 bar 5,000 psi / 350 bar
500 psi / 35 bar 10,000 psi / 700 bar

Vacuum is supported in all units up to 500 psi / 35 bar.
External pressure modules (APMs) can be added to support additional

pressure ranges.

Read this manual carefully before using the instrument and make
sure that all safety instructions and warnings are observed.

1.1 Contacting Ametek

US, Canada, Latin America AMETEK TCI at 1-800-527-9999
Europe, Africa, Middle East AMETEK Denmark A/S at + 45 4816 8000
Asia AMETEK Singapore Pte. Ltd. at

+ 65 (64) 842 388

1.2 Standard Equipment

Inspect the unit carefully upon receipt. Save packing carton in case re­shipment is necessary. If there appears to be any damage, equipment missing
or if there are any questions about the unit, contact AMETEK.

Check to see if your calibrator is complete. It should include:

• APC Calibrator

• Instruction Manual

• Test Leads

• Carrying Case

• (2) Pressure Fittings

• Calibration Certificate

1

1.3 Safety information

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

AC (Alternating Current)

AC-DC

Battery

CE Complies with European Union Directives

DC

Double Insulated

Electric Shock

Fuse

PE Ground

Hot Surface (Burn Hazard)

Read the User’s Manual (Important Information)

Off

On

Canadian Standards Association

Crossed out wheeled bin (comprehended by the directive 2002/95/EC)

2

The following definitions apply to the terms “Warning” and “Caution”.

• “Warning” identifies conditions and actions that may pose hazards to the
user.

• “Caution” identifies conditions and actions that may damage the
instrument being used.

Use the calibrator only as specified in this manual, otherwise injury and
damage to the calibrator may occur.

Warning

To avoid possible electric shock or personal injury:

• Do not apply more than the rated voltage. See specifications for
supported ranges.

• Thermostats must not be connected to any other voltage source during
a test

• Follow all equipment safety procedures.

• Never touch the probe to a voltage source when the test leads are
plugged into the current terminals.

• Do not use the calibrator if it is damaged. Before you use the calibrator,
inspect the case. Look for cracks or missing plastic. Pay particular
attention to the insulation surrounding the connectors.

• Select the proper function and range for your measurement.

• Make sure the battery cover is closed and latched before you operate the
calibrator.

• Remove test leads from the calibrator before you open the battery door.

• Inspect the test leads for damaged insulation or exposed metal. Check
test leads continuity. Replace damaged test leads before you use the
calibrator.

• When using the probes, keep your fingers away from the probe contacts.
Keep your fingers behind the finger guards on the probes.

• Connect the common test lead before you connect the live test lead.
When you disconnect test leads, disconnect the live test lead first.

• Do not use the calibrator if it operates abnormally. Protection may be
impaired. When in doubt, have the calibrator serviced.

• Do not operate the calibrator around explosive gas, vapor, or dust.

• When using a pressure module, make sure the process pressure line is
shut off and depressurized before you connect it or disconnect it from
the APC or pressure module.

• Disconnect test leads before changing to another measure or source
function.

3

• When servicing the calibrator, use only specified replacement parts.

• To avoid false readings, which could lead to possible electric shock or
personal injury, replace the battery as soon as the battery indicator
appears.

• To avoid personal injury or damage to the calibrator, use only the
specified replacement parts and do not allow water into the case

Caution

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

• Disconnect the power and discharge all high-voltage capacitors before
testing resistance or continuity.

• Use the proper jacks, function, and range for your measurement or
sourcing application.

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

• Maximum torque allowed is 15Nm/10 ftlbs. NEVER exceed the torque
allowed.

• To avoid damaging the plastic lens and case, do not use solvents or
abrasive cleansers.

Clean the calibrator with a soft cloth dampened with water or water and
mild soap.

4

5

2. Calibrator Interface

2.1 Display and Inputs

The calibrator display has two numeric character lines. The large line
shows the measured pressure, and the small line shows the measured
current. The measured current may be displayed in mA, in percentage of
mA range (4mA - 20mA), where 0% corresponds to 4mA and 100% to
20mA, or percent error (see section 4.3). Pressure units are located on the
right side of the display. For a listing of all the units supported refer to the
table in the Specifications section.

The calibrator has two sets of input terminals located on top of the unit and
a pressure fitting located on the bottom of the unit. The input terminals on
the right are used for measuring current. The terminals on the left are used
for pressure switch connection.

2.2 Key Functions

Figure 1 shows the layout of the calibrator keypad while Table 1 lists the
individual keys and their functions.

Table 1: Key Functions

Key Function

1 Turns the unit on and off
2 Select different pressure units. Press and hold while unit is powering up to

change the power saver setting. Also used for % error data entry.

3 Switches the lower numeric display between mA, percentage of range and

% error function. This key also enables loop power when held during

power up.
4 Zeroes the pressure sensor. Also acts as enter key in the % error mode.
5 Used in Switch Test mode (see section 5)
6 Displays the minimum and maximum pressure and current measured since

power up. Also used for % Error data entry

6

Figure 1

2.3 Power Saver

The calibrator has an adjustable power saver option that allows it to shut
down after being idle (no keys pressed) for a period of 1 to 30 minutes. To
set the shutoff time:

1. Press and hold the (UNITS) key while powering up the unit.

2. A number from 1 to 30 or OFF will appear on the bottom of the display.

3. Use the (UNITS) key to increase the number, and the (MAX/MIN) key to
decrease the number.

4. To disable power saver mode decrease the number until OFF is

displayed on the screen.

5. Press the (ZERO) key to save the settings and return to normal

operation.

7

3. Measuring Pressure and Current

Warning

Make sure the process pressure line is shut off and depressurized before
you connect it or disconnect it from the APC or pressure module.

Caution

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

• Maximum torque allowed is 15Nm/xx ftlbs. NEVER exceed the torque
allowed.

To measure pressure, connect the calibrator using an appropriate fitting.
Choose a pressure unit for measurement with the (UNITS) key. Pressure will
be displayed on the large numeric display. Use the (ZERO) key to zero the
pressure sensor when vented to atmospheric pressure

Important NOTE: To ensure accuracy of the calibrator it is critical to zero
the APC before a device is calibrated.

To measure current use the mA input terminals on the top of the calibrator.
Current can be measured in mA or percentage of range. The range on the
calibrator is set to 0% at 4 mA and 100% at 20 mA. For for example if the
current measured is displayed as 75% then the mA value is 16 mA.

3.1 Media Compatibility

The APC calibrator utilizes a media isolated sensor to prevent sensor
contamination. Whenever possible clean, dry air is the media of choice. If
that is not always possible, make sure that the media is compatible with
the following wetted parts:

Low Pressure - Unit range up to 200 PSI High Pressure - Unit range 500

PSI and up

1) Nickel plated brass 1) 316 Stainless Steel

2) Glass

3) RTV (silicone)

4) BUNA-N

3.2 Measuring Pressure with External Modules (APMs)

The APC provides a digital interface to External Pressure Modules (APMs).
These modules are available in various ranges and types including gauge,
vacuum, differential and absolute. The modules work seamlessly with the
calibrator. Simply plug them in to the interface and the reading from the
internal sensor will be replaced by that of the APM. Since the interface

8

between the APC and the APM is digital all the accuracy and display
resolution is derived from the APM.

3.3 Zeroing of External Modules (APMs)

The zeroing of the APM is stored separately from that of the internal sensor.
Use the (ZERO) key to zero the APM. For zeroing of absolute APMs, use
the (▲), (▼) and (ENTER) keys to enter the barometric reference pressure.
The APC stores barometric reference pressure for one absolute module at
a time.

3.4 Minimum and Maximum Measurements

The calibrator automatically records the maximum and minimum values for
pressure that were read by the calibrator since it has been turned on or
reset. The current or mA reading is also stored for the corresponding
pressure value. To recall the recorded values from memory press the
(MAX/MIN) key. To clear the memory press and hold the (MAX/MIN) key
until “CLR” is displayed.

4. Calibrating Transmitters

Warning

• Do not apply more than the rated voltage. See specifications for
supported ranges.

• Thermostats must not be connected to any other voltage source during a
test

Caution

• Disconnect the power and discharge all high-voltage capacitors before
testing resistance or continuity.

4.1 Using the mA Input Function

The mA input function allows the user to read back the 4 to 20 mA output
from the device being calibrated. This can be done in one of two ways:

1. Passively – Where the device under test directly generates a 4 to 20 mA

and can be read by the APC

2. Actively – Where the APC supplies 24 VDC loop power to the device

under test to power the device while reading the resulting 4
to 20 mA signal.

When the APC is first powered up it always defaults to the passive mA
input mode. To activate loop power do the following steps:

1. Before turning on the APC press and hold down the (% mA) key.

9

2. Press the Power key while continuing to hold down the (% mA) key.

3. Allow the unit to go through the initial power-up sequence (about 5
seconds) then release the (% mA) key.

4. Note that the LCD will display LOOP PWR. Loop power will remain on
until the APC is turned off. Remember loop power is only activated
when this sequence is followed. Unless this sequence is performed
during power up the APC will always default to the passive input mode.

4.2 Calibrating a Pressure-to-Current Transmitter

To calibrate a pressure-to-current transmitter (P/I), perform the following
steps:

1. Connect the calibrator and the pump to the transmitter as shown in the
setup in Figure 2.

2. Apply pressure with the pump.

3. Measure the current output of the transmitter.

4. Ensure the output is correct. If not, adjust the transmitter as necessary.

Figure 2

10

4.3 Percent Error Function

The APC features a unique function which can calculate pressure vs.
milliamp error as a percentage of the 4 to 20 mA loop span.

Example:
Suppose a pressure transmitter under test is 30 psi (2 Bar) Full Scale and
outputs a corresponding 4 to 20 mA signal. The user can program in a 0 to
30 psi pressure span into the APC and the APC will calculate and display
the deviation or % Error from the expected 4 to 20 mA output. This
eliminates the need for manual calculations and also helps if it becomes
difficult to set an exact pressure with an external pump.

To use the %Error function proceed as follows:

1) With the APC turned on and operating press and hold the (mA/%) key
for approximately 3 to 5 seconds until the word “HI” appears in the lower
portion of the LCD

2) Using the units (▲) key and the max/min (▼) adjust the display for the
desired full scale value. Then press the (ENTER) key.

3. The word “LO” will appear on the lower half of the LCD. Again using the
arrow keys set the display to read the low point of the desired pressure
range.

4. Press the (ENTER) again and the APC will be in the % ERROR mode
ready for use.

5. The LO and HI points will remain in non-volatile memory until they are
changed again by the user.

11

5. Performing a Pressure Switch Test

Warning

• Do not apply more than the rated voltage. See specifications for
supported ranges.

To perform a switch test, follow these steps:

1. Connect the calibrator to the switch using the pressure switch terminals.

Then connect the pump to the calibrator and the pressure switch. The
polarity of the terminals does not matter. This set up is shown in Figure

3.

2. Make sure the vent on the pump is open. Zero the calibrator if

necessary. Close the vent after zeroing the calibrator.

3. Press the (SWITCH TEST) key to enter pressure switch test mode. The

calibrator will display CLOSE instead of a mA measurement.

4. Apply pressure with the pump slowly until the switch opens.

Important Note: In the switch test mode the display update rate is
increased to help capture changing pressure inputs. Even with this
enhanced sample rate pressurizing the device under test should be
done slowly to ensure accurate readings.

5. Once the switch is open, OPEN will be displayed, bleed the pump slowly

until the pressure switch closes. RECALL will appear on the display.

6. Press the (SWITCH TEST) key to read the pressure values for when the

switch opened, for when it closed, and for the dead band.

7. Hold the (SWITCH TEST) key to clear the data and perform another test.

8. Press the (mA/%) key to cancel the test.

Important NOTE: The above example uses a normally closed switch. The
basic procedure is still the same for a normally open switch, the display will
just read OPEN instead of CLOSE.

12

Figure 3

13

6. Remote Operation

The calibrator can be remotely controlled using a PC terminal, or by a
computer program running the calibrator in an automated system. It uses
an RS232 serial port connection for remote operation. With this connection
the user can write programs on the PC, with Windows languages like
Visual Basic to operate the calibrator, or use a Windows program such as
Hyper Terminal, to enter single commands. Typical RS232 remote
configurations are shown in Figure 4.

Figure 4

6.1 Setting up the RS232 Port for Remote Control

Note: The RS232 connection cable should not exceed 15m unless the

load capacitance measured at connection points is less than 2500pF.
Serial parameter values:

9600 baud
8 data bits
1 stop bit
no parity
Xon/Xoff
EOL (End of Line) character or CR (Carriage Return) or both

To set up remote operation of the calibrator on the Windows Hyper
Terminal, connected to a COM port on the PC as in Figure 4, use the
following procedure:

1. Start Hyper Terminal (located in Accessories/Communications of the

Windows Start menu)

14

2. Select New Connection.

3. For Name enter APC. Select the com port to which the unit is connected.

4. Enter the above information for port settings.

5. Select ASCII setup from File/Properties/Settings and mark these choices:
Echo typed characters locally
Wrap lines that exceed terminal width

6. Select OK

7. To see if the port works enter “*IDN?”. This command will return

information on the unit.

6.2 Using Commands

6.2-1 Command types

Refer to the Section on Remote Commands for all available commands.
The calibrator may be controlled using commands and queries. All
commands may be entered using upper or lower case. The commands are
divided into the following categories:

Calibrator Commands

Only the calibrator uses these commands. For example

LOWER_MEAS DCI

tells the calibrator to measure current in mA on the lower display.

Common Commands

Standard commands used by most devices. These commands
always begin with an "*". For example

*IDN?

tells the calibrator to return its identification.

Query Commands

Commands that ask for information. They always end with a "?".
For example:

FUNC?

Returns the selected modes of the upper and lower displays.

Compound Commands

Commands that contain more than one command on one line.

For example:

LOWER_MEAS DCI; PRES_UNIT PSI
Sets the calibrator to measure current in mA on the lower display
and sets pressure unit to psi.

15

6.2-2 Character Processing

The data entered into the calibrator is processed as follows:

• ASCII characters are discarded if their decimal equivalent is less than
32 (space), except 10 (LF) and 13 (CR).

• Data is taken as 7-bit ASCII.

• The most significant data bit is ignored.

• Upper or lowercase is acceptable.

6.2-3 Response Data Types

The data returned by the calibrator can be divided into four types:

Integer

For most computers and controllers they are decimal numbers
ranging from -32768 to 32768.

Floating

Numbers that have up to 15 significant figures and exponents.

Character Response Data (CRD)

Data returned as keywords. For example:

PRES_UNIT? returns PSI

Indefinite ASCII (IAD)

Any ASCII characters followed by EOM. For example:

*IDN? returns AMETEK, APC, 0, 1.00

6.2-4 Calibrator Status

Error Queue

If an error occurs due to invalid input or buffer overflow, its error
code is sent to the error queue. The error code can be read from
the queue with the command FAULT?. The error queue holds 15
error codes. When it is empty, FAULT? returns 0. The error queue
is cleared when power is reset or when the clear command
*CLS is entered.

Input Buffer

Calibrator stores all received data in the input buffer. The buffer
holds 250 characters. The characters are processed on a first in,
first out basis.

16

6.3 Remote Commands and Error Codes

The following tables list all commands that are accepted by the calibrator.

Table 2: Common Commands

Command Description

*CLS *CLS (Clear status.) Clears the error queue.
*IDN? Identification query. Returns the manufacturer, model number, and

firmware revision level of the Calibrator.

Table 3: Calibrator Commands

Command Description

CAL_START Puts the calibrator in calibration mode
FUNC? Returns the functions that the upper and lower displays are in.
FAULT? Returns an error code from the error queue.
PRES? Returns the model and serial number of the attached pressure

module.
LOWER_MEAS Sets the mode for measuring on the lower display.
PRES_UNIT Sets the pressure unit for the upper display.
PRES_UNIT? Returns the pressure unit for the upper display.
VAL? Returns the measured values.
ZERO_MEAS Zeros pressure for either the calibrator of the attached module.
ZERO_MEAS? Returns the current zero offset value.
MINMAX_RST Resets the min and max value.
MIN? Returns the min pressure since the last time it was reset, also

returns the mA read at that value.
MAX? Returns the max pressure since the last time it was reset, also

returns the mA read at that value.
ST_START Begins a switch test.
ST_OPEN? Returns pressure at which the switch opened (switch test mode).
ST_CLOSE? Returns pressure at which the switch closed (switch test mode).
ST_DEAD? Returns deadband pressure of the switch (switch test mode).
HI_ERR Sets the upper limit pressure for the % error calculation.
HI_ERR? Returns the upper limit pressure used for the % error calculation.
LO_ERR Sets the lower limit pressure for the % error calculation.
LO_ERR? Returns the lower limit pressure used for the % error calculation.

17

Table 4: Parameter units

Units Meaning

A Amps of current
mA milliamps of current
PERCENT Current measured as a percentage of a 4-20 mA loop.
PERCENT_ERROR Current measured as a percentage of deviation from a 4-20 mA

loop, relative to pressure measured, and user selectable pressure

limits.
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

Table 5: Error codes

Error Number 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

18

116 Pressure module not connected
117 An unknown command was received
120 The serial input buffer overflowed
121 Too many entries in the command line
122 The serial output buffer overflowed

6.4 Entering Commands

Commands for the calibrator may be entered in upper or lower case.
There is at least one space required between the command and parameter,
all other spaces are optional. This section will briefly explain each of the
commands and describe their general use. This will include parameters
that may be entered with the command as well as the response(s) of a
query command.

6.4-1 Common Commands

*CLS

Clears error queue. When writing programs, use before each
procedure to avoid an error buffer overflow.

*IDN?

Returns the manufacturer, model number, and firmware revision
of the calibrator. For example:

*IDN? will return AMETEK, APC, 0, 1.00

6.4-2 Calibrator Commands

CAL_START

Puts the calibrator in calibration mode. The main display will
read CAL MODE and a calibration menu will be displayed on the
terminal if the correct password is entered.

FUNC?

Returns the mode of the upper and lower displays.
Upper responses are PRESSURE, and RECALL (switch test
mode).
Lower responses are DCI, DCI_PERCENT, DCI_ERR, and
SWITCH_TEST.
For example, if the calibrator is set to read pressure on the upper
display, and current in mA on the lower display, FUNC? Would
return:

PRESSURE,DCI

19

FAULT?

Returns the error code from the error queue . The command
may be entered when the previous command did not do what it
was expected to do.
For example, if an entered pressure unit is invalid, FAULT? Would
return:

109 which is the code number for an invalid pressure
unit.

Refer to the Error Codes table for more information on error code
numbers.

PRES?

Returns the model and serial number of the attached pressure
module. Returns NONE if no pressure module is attached. For
example:

PRES? Could return AMETEK,001PNS,3,0

LOWER_MEAS

Sets the lower display measure mode. The command is followed
by any of the following parameters. Enter DCI for current in mA,
DCI_PERCENT for current displayed as a percentage of 4-20
mA, DCI_ERR for current displayed as a percentage of error from
4-20 mA based on the current pressure reading and user
definable pressure limits. For example:

LOWER_MEAS DCI_PERCENT sets the lower display
mode to current displayed as a percentage of 4-20 mA

PRES_UNIT

Sets the pressure units of the upper display. Valid pressure units
are as follows:

Psi
Bar
Mbar
Kg/cm2
InH2O4C
InH2O20C
InH2O60F
mH2O4C
mH2O20C
cmH2O4C
cmH2O4C
ftH2O4C
ftH2O20C
ftH2O60F
Inhg0C

20

Mmhg0C
Kpal

For example to set the unit on the upper display to bar:

PRES_UNIT Bar

PRES_UNIT?

Returns the pressure units of the upper display. For example, if
the unit on the upper display is bar the command will return:

BAR

VAL?

Returns the value of any measurement taking place on the upper
and lower display. For example, if the upper display is measuring
5 psi, and the lower display is measuring 5%ERR, then VAL? will
return:

5.000000E-00, PSI, 5.000000E+00, PERCENT_ERROR

ZERO_MEAS

Zeros the pressure reading of the calibrator or zeroes the
attached pressure module. Enter the zeroing value after the
command when zeroing an absolute pressure module.

ZERO_MEAS?

Returns the zero offset or the reference value for absolute
pressure modules.

MINMAX_RST

Resets the min and max values.

MIN?

Returns the minimum pressure value and mA value at that
pressure since the last time it was reset.

MAX?

Returns the maximum pressure value and mA value at that
pressure since the last time it was reset.

ST_START

Puts the unit in switch test mode.

ST_OPEN?

Returns the pressure at which the pressure switch opened. This
is only available in switch test recall mode (after the test has
been completed).

21

ST_CLOSE?

Returns the pressure at which the pressure switch closed.
This is only available in switch test recall mode (after the
test has been completed).

ST_DEAD?

Returns the deadband of the pressure switch. This is only
available in switch test recall mode (after the test has been
completed).

HI_ERR

Sets the upper limit pressure for the percent error
calculation.

HI_ERR?

Returns the upper limit pressure for the percent error
calculation.

LO_ERR

Sets the lower limit pressure for the percent error
calculation.

LO_ERR?

Returns the lower limit pressure for the percent error
calculation.

7. Specifications

Table 6: Pressure

Pressure range in bar 0.7, 2, 15, 35, 70, 200, 350, 700 bar
Pressure range in psi 10, 30, 200, 500, 1000, 3000, 5000, 10,000 psi
Supported pressure units psi, bar, mbar, kg/cm2, inH2O @ 4°C, inH2O

@20°C, inH2O @60°C, mH2O @4°C, mH2O
@20°C, cmH2O @4°C, cmH2O @20°C, ftH2O
@4°C, ftH2O @20°C, ftH2O @60°C, inHg @0°C,

mmHg @0°C, kPa
Overload maximum +50% F.S. (10000/700 Bar is 20%)
Overload alarm Activates at approximately +20% F.S.
Connection 1/8in NPT female for ranges 200 psi and under /

1/8in NPT male for ranges over 200 psi
Positive accuracy ± 0.04% of reading ± 0.01% F.S. (All ranges

except 10 psi)

.05% F.S. (0°C to 50°C) (10 psi)
Vacuum accuracy ± 0.05% F.S. (10, 30, 200, 500 psi units only)

(10°C to 45°C)

0.1% F.S. (10 psi)

Operating temperature -10°C to 50°C / 14°F to 122°F (Temp. comp. 0 to

50°C)
Storage temperature -20°C to 60°C / -4°F to 140°F
Temperature Compensation ± 0.005% F.S./ °C outside 18 to 28°C

for electrical ± 0.003% F.S./ °F outside 64 to 82°F

Table 7: General Specifications

LCD Dual information LCD plus icon indicators
Display resolution 5 digits
Display update Approximately 4 times per second (faster during

switch test)
Switch test capture 50 milliseconds
mA input (0-24mA) Accuracy: ± 0.015% of reading ± 2µA
Switch test Supply max 9V
Batteries 1 x 9 VDC Alkaline
Low battery indicator 7 VDC
Size 188mm x 84mm x 52mm / 7.37in x 3.31in x 2.05in
Weight 400g / 14.1oz

All above specifications are specified at 23°C ± 5°C / 74.3°F ± 9°F unless otherwise noted.

22

8. Maintenance

8.1 Replacing Batteries

Replace batteries as soon as the battery indicator turns on to avoid false
measurements.

Note: Use only 9 Volt alkaline battery.

8.2 Cleaning the Unit

Warning

To avoid personal injury or damage to the calibrator, use only the specified
replacement parts and do not allow water into the case.

Caution

To avoid damaging the plastic lens and case, do not use solvents or
abrasive cleansers.

Clean the calibrator with a soft cloth dampened with water or water and mild
soap.

8.3 Service Center Calibration or Repair

Only qualified service personnel should perform calibration, repairs, or
servicing not covered in this manual. If the calibrator fails, check the
batteries first, and replace them if needed.

Verify that the calibrator is being operated as explained in this manual. If the
calibrator is faulty, send a description of the failure with the calibrator. Be
sure to pack the calibrator securely, using the original shipping container if it
is available.

8.4 Replacement Parts & Accessories

Order Number Description

SPK-APC-001 Operating Manual
SPK-HHC-002 Soft carrying case
104203 Test Lead Set
11-90110 Fitting - 1/8 NPT Female x 1/4 BSP Female
11-90111 Fitting - 1/8 NPT Female x 1/4 NPT Female
601104 Teflon Tape
123958 RS232 - Stereo to Serial connection
124004 Shoulder strap with snap hooks
T-870 Fitting - 1/8 NPT Male x 1/4 BSP Female
11-90067 Fitting - 1/8 NPT Male x 1/4 NPT Female

23

24

SPK-APC-001 0219133 Rev D 1/05

AMETEK

Test & Calibration Instruments Division

8600 Somerset Drive

Largo, FL 33773 USA

TEL [phone]

TOLL-FREE 800-527-9999

FAX [phone]

E-mail: [e-mail]

AMETEK Denmark A/S Gydevang 32-34

Post Office Box 30

DK-3450 Allerod

Denmark

Tel [phone]

Fax [phone]

E-mail [e-mail]

AMETEK Precision Instruments Europe GmbH

Postfach 2165

D-40644, Meerbusch

Germany

Tel [phone]

Fax [phone]

E-mail [e-mail]

AMETEK Singapore Pte. Ltd.

10 Ang Mo Kio Street 65

#05-12 TECHPOINT

Singapore 569059

Tel [phone]

Fax [phone]

E-mail [e-mail]