Ashcroft GL42 - Low Differential Indicating Pressure Transmitter - Manual

1. GENERAL:
A failure resulting in injury or damage may be caused by ex-
cessive overpressure, excessive vibration or pressure pulsa-
tion, excessive instrument temperature, corrosion of the
pressure containing parts, or other misuse. Consult Ashcroft
Inc., before installing if there are any questions or concerns.
2. OVERPRESSURE:
Pressure spikes in excess of the rated overpressure capabil-
ity of the transducer may cause irreversible electrical and/or
mechanical damage to the pressure measuring and contain-
ing elements.
3. STATIC ELECTRICAL CHARGES:
Any electrical device may be susceptible to damage when
exposed to static electrical charges. To avoid damage to the
transducer the operator/installer should follow proper ESD
(electrostatic discharge) protection procedures before han-
dling the pressure transducer.
4. DESCRIPTION
The Ashcroft® Model GL42 is a low differential pressure
transmitter to be used on clean, dry, non-corrosive gases. It
is available in two accuracy classes and its performance is
traceable to the U. S. National Institute of Standards and
Technology (NIST). The 7 or 5 located in the fifth position
of the product code distinguishes a 1.0% from a 0.5% accu-
racy transmitter. Both unidirectional (e.g. 0 to +1.0 IW) or bi-
directional (e.g. ±2.0 IW) models are available.
5. SPECIFICATIONS
Reference condition: 77°F (25°C)
Accuracy*: ±0.50% or ±1.00% F.S. (URL)
(* includes linearity, hysteresis and repeatability)
Repeatability: ≤ ±0.1 % F.S.
Stability: </= 0.5% F.S. / Year
Zero / Span Adjustment: ±5% F.S.
Standard-Ranges (Unidirectional):
0.10˝ to 25.00˝ in H
2
0
Standard-Ranges (Bidirectional):
±0.05˝ to ±15.0˝ in H
2
0
6. ENVIRONMENTAL SPECIFICATIONS
Enclosure Rating: IP65
Temperature Limits:
Operating: –4/158°F (–20/70°C)
Storage: -40/194°F (–40/90°C)
Compensated: 35/129°F (2/54°C)
(10-90% R.H. non-condensing)
Temperature Coefficients:
Zero & Span ±0.06%/K within 35/129°F (2/54°C)
Ref. 77°F (25°C)
GL42 DIFFERENTIAL PRESSURE
TRANSMITTER INSTALLATION &
MAINTENANCE SHEET
WARNING READ
BEFORE INSTALLATION
FUNCTIONAL SPECIFICATIONS
Static (line) Pressure: All Pressure Ranges
Proof: 14.5 psi (1 bar)
Burst: 24.65 psi (1.7 bar)
Max. Static: 24.65 psi (1.7 bar)
8. ELECTRICAL SPECIFICATIONS
LCD Display: 4 Digit
LCD Screen Dimensions:
Width: 1.77” (45mm) / Height: 0.75” (19mm)
LCD Character Size:
Height: 0.21” (5.4mm) / Width: 0.45” (11.5mm)
Output Signal: 4-20 mA ( 2 wire)
Supply Voltage: 19-36 Vdc (Nominal 24 Vdc)
Rangeability / Adjustment: Zero: ±1/3 F.S.
CE-Compliance: EN 61000-4-2, EN 61000-4-3
9. MECHANICAL SPECIFICATIONS
Process Connection: Brass / Aluminum
1/8” Female NPT or 1/4” Male Barbed Fitting
Electrical Connection:
½” Female DIN Cable Conduit (Standard)
PG9 Cable Gland (Option
Enclosure: Nylon
Cable Connection Socket: Nylon
Front Foil: Polyester
Electrical Connection: Screw Terminal
Weight: 9.9 oz (308 g)
Mounting:
Wall Mount (Standard)
DIN Rail (Option): EN 50022 / EN 50035 / EN 50045
Panel Mount (Option)
10. INTENDED USE
The GL42 is a 2-wire transmitter.
It is suitable for accurate measurement of low gauge, vacu-
um or differential pressure of non-conductive and non-corro-
sive gaseous media.
11. PRODUCT DESCRIPTION AND FUNCTION
a. Function diagram
© 2014 Ashcroft Inc. 250 East Main Street, Stratford, CT 06614 USA. Tel: 203-378-8281, Fax: 203-385-0402 www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M011-10227 5/14
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