 |
|
Type
K8 Thin Film
Pressure Transducer |
- Superior long-term stability and repeatability
- Miniature size and light weight
- Millivolt output
- Wide range of pressure and electrical
connections available
|
|
The
Ashcroft® K8 transducer introduces the benefits of polysilicon thin
film performance at affordable prices. Modern low-pressure chemical
vapor deposition methods provide simple, stable molecular bonds between
a proven metal diaphragm and a polysilicon strain gage bridge. There are
no epoxies or bonding agent to contribute to signal instability or
drift.
The polysilicon strain resistors combine very low noise levels with very
high signal output. There are no semiconductor (p-n) junctions to change
with temperature, time or use. The integral metal diaphragm and
polysilicon bridge are virtually unaffected by shock, vibration or
mounting position.
These transducers are offered in many standard pressure ranges with
high-quality millivolt output.Signal output is proportional to supply
voltage, and sensitivity varies between 6-18 mV/V at full scale.
Transducer performance is directly traceable to the National Institute
of Standards, and Technology and specifications are conservatively
stated. A calibration test certificate is available with each
transducer. |
 |
| PERFORMANCE
CHARACTERISTICS |
| Standard
Ranges (psi) |
| 0/15* |
0/300 |
0/5000 |
vac./60* |
| 0/30* |
0/500 |
0/7500 |
vac./45* |
| 0/60* |
0/750 |
0/10,000* |
vac./30* |
| 0/100 |
0/1000 |
0/15,000* |
vac./15* |
| 0/150 |
0/2000 |
0/20,000 |
vac./0* |
| 0/200 |
0/3000 |
|
|
*
1% accuracy ranges only.
Consult factory for nonstandard ranges. |
| Accuracy
Class (F.S.): |
0.5% |
1% |
| Nonlinearity |
|
|
| Terminal
Point* |
±0.4 |
±0.7 |
| Best
fit straight line(BFSL) |
±0.25 |
±0.4 |
| Hysteresis |
±0.15 |
±0.2 |
| Nonrepeatability |
±0.05 |
±0.07 |
| Interchangability |
±0.5% |
±1.0% |
| *
Including hysteresis |
| Durability: |
| 108
cycles 20.80%F.S. with negligible performance change. |
| Stability: |
±1.0%F.S./yr |
| ENVIRONMENTAL
CHARACTERISTICS |
| Temperature
Limits: |
| Storage: |
-65
to +250°F |
| Operating: |
-20
to +180°F |
| Compensated
Range: |
-20
to +160°F |
| Thermal
Coefficients: (68°F ref.) %F.S./°F |
| Standard: |
0.5% |
1.0% |
| ZERO |
±0.028% |
±0.04% |
| SPAN |
±0.028% |
±0.04% |
| Optional: |
| ZERO |
±0.014% |
N/A |
| SPAN |
±0.014% |
N/A |
| Multiply
thermal zero coefficients by 1.5 on 0/30 psi, vac/15 range and
by 3 on 0/15 and vac/0 ranges. |
| Humidity: |
| No
performance effect at 95% relative humidity-noncondensing |
|
|
| FUNCTIONAL
CHARACTERISTICS |
| Overpressure
Limits (F.S.): |
| |
0/15-
0/2000 |
0/3000-
0/5000 |
0/7500-
0/20,000 |
| Proof |
200% |
150% |
120% |
| Burst |
800% |
300% |
150% |
| Shock: |
| Less
than ±0.0.05% F.S. effect for 100g's 20ms shock in any axis |
| Vibration
Sweep: |
| Less
than ±0.1% F.S. effect for 0-2000Hz at 20g's in any axis |
| Position
Effect: |
| Less
than 0.1% F.S. |
| ELECTRICAL
SPECIFICATIONS |
| Sensitivity: |
| Output
signal varies from 6-18mV/V at full scale, output proportional
to supply voltage. |
| Excitation: |
| 3-10
Vdc regulated |
| Zero
Offset: |
| ±3mV/Vdc |
| Bridge
Resistance: |
| 3500
ohms (nominal) |
| Supply
Current: |
| 1.4mA
(nominal) |
| Circuit
to Case Insulation Resistance: |
| >100
M ohms @ 50 Vdc |
|
|
| PHYSICAL
CHARACTERISTICS |
| Enclosure: |
| NEMA
4X (NEMA 1 only if <500 psig and electrical termination is
Bendix® or Hirschman®) |
| Weight: |
| 2
oz. (approx. without cable F1 Type) |
| MATERIALS: |
| Case: |
| 316
and 300 Series stainless steel |
| Cable: |
| 4"
polyethylene coated, 30 AWG or UL approved 36", shielded,
vented cable (24AWG) |
| Diaphragm: |
| 17-4
PH stainless steel |
| Standard
Process Connections: |
| (316
stainless steel) |
| 1/8
NPT male or female |
| 1/4
NPT male or female |
| 1/4
SAE-J-514 male |
| 1/8
AMINICO female required for pressures over 10,000 psi |
| Other
connections available |
|
| PART
NUMBER FOR A TRANSDUCER/TRANSMITTER: |
| Select: |
K8 |
3 |
MO1 |
MV |
F2 |
200
psi |
| |
Type
(K1) |
Accuracy
(3) 0.50%, ±0.014%/°F
(5) 0.50%, ±0.025%/°F
(7) 1.0%, ±0.040%/°F |
Pressure
Connection
(M01) ¹/8 NPT-M
(F01) ¹/8 NPT-F
(M02) ¼ NPT-M
(F02) ¼ NPT-F
(MEK) 7/16-20-M
(F09) aminco 9/16-18-F
(T01) ¼ Comp. Fit
(000) None |
Sensititivy
(MV) mV/V |
Electrical
Termination
(F1) 4" leads
(F2) 36" cable, shielded, PVC sheathing |
Pressure
Range
(100) 100psi
(20,000) 20,000psi |
| 1-877-ASHCROFT |
Credit Cards Accepted by PSI
 |
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