NEP-9500 MANUAL V1.01
Observator Instruments V1.01
Copyright 2017
©
Page 9
Measurement
NEP-9500-PLUS
Technique
ISO7027-90
°
Range
To customer requirements
Output Span
±2.5Volts or 4 – 20mA, where -2.5V or 4mA = 0NTU
0 to + V and 0 to +2.5V outputs are also available.
Specify output at time of order.
Response Time
Approx 1 second.
Linearity
1%
0 to 10NTU
1%
0 to 400NTU
2%
0 to 1,000NTU
5%
0 to 3,000NTU
Repeatability @
25°C
± 2% across the board
Temperature
Coefficient (0 to
40°C)
< ±0.05%/°C
Calibration
compliance using
APS AEPA
polymer solutions
3 points calibration to range
2 points calibration to output span
Environmental
Static Depth Rating
200m (stainless steel casing), 50m (composite casing)
Operating Temp.
-5°C to +40°C
Storage Temp.
-20°C to +50°C
Wiper
Wiper Arrangement
(NEP-9500 SERIES only)
Disposable and consumable – Foam Pad on PVC or Acetal arm. Field
replaceable. Mounted on central shaft, fixed by hex set screw onto flat of
wiper shaft.
Actuation
(NEP-9500 SERIES only)
1. By external TTL/CMOS active low pulse or momentarily
contacting the wiper actuation conductor (pin 5) to 0V (pin 3).
2. Automatic wipe (periodic and power on). Please specify during
the order.
Actuation Pulse Duration
On NEP-9500 series only.
>50mSec, <500mSec
Actuation Pulse Current Sink
On NEP-9500 series only.
1mA max.
Wiping Time
On NEP-9500 series only 8 second nominal.
During the wipe the output is held to the output value just prior to the
wipe.
Power
Operating Voltage
8-30V DC
Current Consumption
25mA maximum when not wiping plus up to 60mA if current output fitted.
Power Settling Time
2 Sec
Wiping Current
NEP-9500 series only. Additional 25mA approx. at less than 10m
submersion.
