Model 88 C
Pressure Transmitter
FEATURES
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A miniature, low-priced,
full featured transmitter—just 1.67 lb. |
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All welded 316 stainless
steel construction and wetted parts (no aluminum) |
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Ranges from 0 to 3 to 0 to
5000 psig (0 to 0.2 to 0 to 350 bar) |
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±0.25% accuracy |
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Zero and span adjustability |
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Full 5:1 range turndown |
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Integral junction box |
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FM and CSA explosion-proof
and intrinsically safe |
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4 to 20 mA output at 12 to
40 VDC |
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5-year warranty |
DESCRIPTION
The Model 88 is the most
durable, accurate and cost-effective pressure transmitter presently available. A
full featured, all stainless steel transmitter, it is designed for years of
stable performance in even the toughest environmental and media conditions.
Approvals include FM and CSA
for both intrinsic safety and explosionproof ratings. CENELEC approval for
intrinsic safety available. The Model 88 also meets NACE standards for offshore
applications. A five year warranty is standard for the 88C.
The small size and light
weight of the Model 88 transmitter eliminates the need for complicated mounting
hardware and mechanical supports, thereby reducing installation time
substantially. The integral junction box permits simple field wiring without the
need for additional hardware, adding to the speed and ease of installation.
A 4 to 20 mA output is
standard with a 12 to 40 VDC power supply. With all 316 stainless steel welded
construction, the Model 88 is compatible with corrosive media and hazardous
environments. With the cover retained by a stainless steel chain and no internal
jumpers for span turndown, losses due to misplaced or dropped parts are
eliminated.
OPERATION
The heart of the Model 88
pressure transmitter is a silicon piezoresistive sensing chip. This miniature
microetched semiconductor gives a voltage output proportional to the applied
pressure. The chip is isolated from the process media by a stainless steel
diaphragm. A silicone oil or other specified fill fluid is used to transmit the
process pressure to the sensor.
An amplifier PCB enclosed in a
sealed chamber is used to convert the millivolt signal from the sensor to a
calibrated 4 to 20 mA transmitter output. Feedthroughs for EMI and RF protection
are used between the amplifier board and the terminal housing.
Each transmitter is tested
over both pressure and temperature ranges. A compensator circuit is used to
bringthe output of the sensor into specification. After compensation, every
transmitter is tested a second time for pressure and temperature effects to
ensure that it meets performance and specifications.
SPECIFICATIONS
| Functional Specifications: |
Pressure Specifications: |
|
Service:
Liquid, Gas or Vapor
Range Limits:
0/3 to 0/15 psi (0/.2 to 0/1 bar)
0/6 to 0/30 psi (0/.4 to 0/2 bar)
0/20 to 0/100 psi (0/1.4 to 0/7 bar)
0/60 to 0/300 psi (0/4 to 0/20 bar)
0/200 to 0/1000 psi (0/14 to 0/70 bar)
0/600 to 0/3000 psi (0/40 to 0/200 bar)
0/1000 to 0/5000 psi (0/70 to 0/350 bar)
Output:
4-20 mADC, limited to 30 mADC
Power Supply:
12 to 40 VDC with reverse polarity protection
Loop Resistance:
1400 ohms max @ 40 volts
Turndown:
5:1
Zero Adjust:
±10%
Span Adjust:
±10%
Temperature Limits:
Electronics (Ambient) -40F to 140F
(-40C to 60C)
Process Interface -40F to 212F (-40C to 100C)
Storage -40 to 212F (-40C to 100C)
Overrange:
300% upper range limit
Humidity Limits:
0-100% RH
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Accuracy:
±0.25% of calibrated span including linearity, hysteresis and repeatability.
Response Time:
Time constant of 20 milliseconds.
Stability:
±0.5% of upper range limit for six months
Temperature Effect: (includes
zero and span)
Compensated -20 to 180F (-29 to 82C)
Between 30F and 130F (-1C and 54C): +1% of URL per 50F (28C)
Between -20F and 180F (-29C and 82C): +1.6% of URL per 50F (28C)
Power Supply Effect:
±0.005% F.S. per volt
Surge Protection:
Standard
Vibration Effect:
±0.1% of upper range limit for 3 g to 200 Hz
Position Effect:
.05% /90 Deg Tilt
Overrange Effect:
±0.15% F.S. per 300% of max. range
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| Physical Specifications: |
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Materials of Construction
Process Wetted Parts:
316 SS
Non Wetted Parts:
316 SS
Cast Head:
CF-8M (316 Cast SS)
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"O" Ring:
Buna N
Fill Fluid:
DC 200 Silicone (Standard)
Electrical Connection:
1/2 NPT Female
Weight:
1.67 lbs. (720 grams)
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| Classifications: |
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Factory Mutual:
Intrinsically safe for Class I, II,
III, Division 1, Groups A, B, C, D, E, F, G for hazardous locations per AMETEK
Dwg. BK750407.
Entity Requirement: Imax = 225mA, Vmax = 36B, CI = 0.126uf, LI = 0mH.
Explosion Proof for Class I, II, III, Division 1, Groups B, C, D, E, G for
hazardous locations.
NEMA 4 Enclosure.
Canadian Standards
Association:
Exia-Intrinsically safe for Class
I, Division 1 & 2, Groups A, B, C, D; Class II, Groups E, F, G when
connected per AMETEK Dwg. BK750483.
Explosion Proof for Class I, Division 1, Groups B, C, D; Class II, Groups E, F,
G; Class III for Hazardous locations. Enclosure 4, Temperature Code T3C (160 C)
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ORDERING INFORMATION
|
Model |
88 |
| Approval |
C = Approved by Factory Mutual &
Canadian Standard Assoc. for I.S. and Exp. Proof |
| Pressure
Range |
002 =
0/3 to 0/15 psi (0/.2) to 0/1 bar)
003 = 0/6 to 0/30 psi (0./4 to 0/2 bar)
004 = 0/20 to 0/100 psi (0/1.4 to 0/7 bar)
005 = 0/60 to 0/300 psi (0/4 to 0/20 bar)
006 = 0/200 to 0/1000 psi (0/14 to 0/70 bar)
007 = 0/600 to 0/3000 psi (0/40 to 0/200 bar)
008 = 0/1000 to 0/5000 psi (0/70 to 0/350 bar) |
| Material |
Base Diaphragm
Fill
A = 316SS 316SS
Silicone Oil |
| Output |
2 = 4 -
20 mADC |
| Calibration
Range |
(specify)
Will be calibrated at maximum range in psi if not specified. |
Example:
88-C-004-A-2-(0 to 50 psi)
Model 88C Pressure Transmitter, FM
and CSA certified, 100 psi maximum range, 316 stainless steel base and
diaphragm, silicone oil fill, output at 4 to 20 mADC and calibrated to 0 to 50
psi.
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