+10
0
-10
0,3 3 30 300 3k
Frequency Hz
Deviation %
FREQUENCY RESPONSE
A/81/F & A/81/F/HT
3.0mm M.I. cable/pot seal with flying
leads x 15cm long
2.5mm M.I. cable/HT Microdot
3.0mm M.I. cable/2 pole connector
FIG. 1 A/81/F - A/81/F/HT
Industrial piezo-electric
accelerometer
A/81/F, A/81/F/HT
CONVERSION MODE KONIC
A/81/F A/81/F/HT
Charge sensitivity pC/g 210/260 25/45
Capacitance pF (ex cable) 1400/2000 300/900
Resonant frequency kHz 10
Cross axis error % max 5
Temperature range °C -50/+300 -50/+400
Charge sensitivity -5% @ -50°C -5% @ -50°C
deviation re 20°C +15% @ +300°C +40% @ +400°C
Pyro-electric output, g/°C 0.1 0.1
Pyro-electric corner freq. Hz 0.001 0.001
Base strain sens. g/μ strain 0.01 0.01
Max continuous accn. g sine 1000
Case material s/steel inconel
303 S31
Mounting 2 x 6.4mm ? holes @ 38.1mm ctrs
Weight gm 150
Case seal welded, hermetic
230pC/g, 300°C max (/F) ? 35pC/g, 400°C max (/F/HT) ? 150gm wt. ? isolated output
hermetic ; integral hardline cable ? Intrinsic version available on request (EEx ia IIC T3)
33
H igh output, industrial grade accelerometer
with integral hardline cable, and available
in two temperature ratings. Hermetic
construction is proof against degradation under
severe operating conditions including high
pressure fluid immersion. /F version is suitable
for milli g monitoring with appropriate
instrumentation.
High temperature vibration measurement may
be subject to increased noise level caused by
insulation resistance drop and high level of pyroelectric
charge generation, necessitating
bandwidth limitation. Low level measurement
threshold is determinated by wide band noise,
series and common mode electrical interference.
These can be minimised by choice of
instrumentation and transducer cabling.
Construction comprises electrically isolated
KONIC sensing element and all welded case and
case/cable seal for maximum measurement
integrity and reliability. Proof pressure testing
and elevated temperature burn in is
recommended where appropriate.
Cable min. bend rad II
perm.
2.5mm temp. radius radius
15mm 7.5mm
perm.
3.0mm temp. radius radius
18mm 9mm
dims. mm
TEMPERATURE
RESPONSE
+20
+10
0
-10
-50 0 +100 +200 +300
Temperature °C
Deviation %
TEMPERATURE
RESPONSE
+40
+20
0
-20
109
108
107
106
-50 0 +100 +200 +300 +400
Temperature °C — - - - Temp. Ins. resistance
Deviation %
Résistance Ω
A/81/F A/81/F/HT
38.1
12.3 28.6
24.6
50.8
OPTIONS
> close tolerance output
> temperature calibration to 400°C (/HT)
> proof pressure testing to 100bar
> cable/connector options are shown in Fig.1
> intrinsic version EEx ia IIC T3