Model A4 Intrinsically Safe and Non-Incendive
Pressure Transmitter
APPLICATIONS:
Oil field equipment, upstream oil and
gas production, natural gas compression
and transfer control, alternative energy
projects
FEATURES:
• FM and CSA listings
• Choice of 0.25, 0.50 or 1.0% accuracy
• Pressure ranges from 5 psi through
10,000 psi
• CE mark
• 316L SS wetted materials, 17-4 PH
optional
• 304 SS case in standard, welded or
explosion proof construction
• Optional absolute pressure ranges
available
• Zero and span access
(Basic Enclosure)
LOOK FOR THESE MARKS
ON OUR PRODUCTS
ENVIRONMENTAL SPECIFICATIONS
Temperature Effects: –20 to +85°C (–4 to 185°F)
• 1.0% of Span for .25% Accuracy Class
• 2.0% of Span for .50% and 1.0% Accuracy Classes
Humidity Effects: No performance effects from
0 to 95% relative humidity, non-condensing,
0-100% RH with “W” enclosure.
*Consult factory
The Ashcroft® A4 pressure transmitter is
ideal for a broad spectrum of pressure
sensing requirements where Intrinsically
Safe or Non-Incendive hazardous location
ratings are required.
The Ashcroft® A4 is designed and manufactured to provide the user with accurate, reliable, and stable output data. This
is accomplished through the use of an on
board microprocessor, that is programmed
during a unique digital compensation
process, to provide extremely linear and
precise performance over the entire specified pressure and temperature range.
PERFORMANCE SPECIFICATIONS
Reference temperature 70°F (21°C)
Accuracy, Three Classes (% Span): ±.25
±0.5 ±1.0
Includes non-linearity (Terminal Point Method), hysteresis,
non-repeatability, zero offset and span setting errors
Best Fit Straight Line* (BFSL):
±.20
±.40 ±.50
Includes non-linearity hysteresis, non-repeatability errors
*Add ±.05% for ranges above 5000 psi
Stability:
ͨ ±0.25% Span/year @ reference conditions
Durability: Greater than 10 million cycles
Temperature Limits:
Storage:
–40 to +125°C
Process:
–40 to +125°C
Operating:
–40 to +125°C
Compensated*:–20 to +85°C
*Consult factory for other options
(–40 to 257°F)
(–40 to 257°F)
(–40 to 257°F)
( –4 to 185°F)
FUNCTIONAL SPECIFICATIONS
Respone Time: <2ms
Pressure Ranges: Vacuum, gauge, compound and absolute
pressure from 0-5 psi through 0-10,000. Equivalent ranges
in bar available. See order guide section (reverse).
Vibration Effect:
Shock:
100g Peak, 11ms
Random:
10g RMS, 20-2000Hz
Sweep:
50-2000Hz, 5g peak
Position Effect: ±0.02% Typical
CE Mark (standard): EN 61326:1997 + A1: 1998 Annex A
Heavy Industrial Immunity (Annex A, Table A.1)
Light Industrial/Residential Emission (Table 4)
Burst
Overpressure (F.S.)*:
Proof
0#/vac. to 300 psi
1.5 x F.S.
min. 2 x F.S.
500-10,000 psi
1.2 x F.S.
1.5 x F.S.
*For higher overpressure ratings use XK8 option.
See page 2 for additional option.
ELECTRICAL SPECIFICATIONS
Output Signal:
Supply Voltage: (unregulated)
Maximum
Minimum
4-20mA*
(2 Wire)
12Vdc
30Vdc
*For Intrinsically Safe see entity parameters for supply voltage
and load limits. Refer to Ashcroft A4 Installation & Maintenance
document “I&M011-10166-A4.”
Power Requirements:
See load chart page 2
Electrical Terminations: See To Order section (reverse.)
for options
Circuit Protection: Reverse polarity and mis-wire protected
Insulation Resisance (Circuit to Case): 100Mohm @ 30Vdc
PHYSICAL SPECIFICATIONS
Case: Material 304SS
Wetted Materials: 316L SS diaphragm and presure port,
optional 17-4PH SS diaphragm and 316L SS pressure port
(see How to Order Section).
Ingress Protection Rating:
Enclosure
Code
Rating
Basic
(S)
IP65, NEMA 4X
All Welded (w/o Z/S)
(W)
IP67, NEMA 6
HAZARDOUS AREA CERTIFICATIONS
Intrinsically Safe – FM/CSA:
Intrinsic Safety:
Class I, II and III Div.1 and 2,
Groups A, B, C, D, F and G per
entity requirements see Ashcroft
drawing # 825A022
Non-Incendive:
Class I, II and III Div.2,
Groups A, B, C, D, F and G, no
barriers needed
NOTE:
Refer to Ashcroft Model A2 for Heavy Industrial,
non-hazardous rated configurations and Ashcroft Model A2X
for Explosion/Flame Proof applications.
BULLETIN A4-1
All specifications are subject to change without notice.
All sales subject to standard terms and conditions.
© Ashcroft Inc. 2012 Rev. 07/12
Ashcroft Inc., 250 East Main Street, Stratford, CT 06614 USA
Tel: 203-378-8281 • Fax: 203-385-0408
email: info@ashcroft.com • www.ashcroft.com