Thermo Fisher Scientific Alpha pH 2000D - Manual (Page 35)

8 Technical Specifications
8.1 General Specification
(a) pH
pH Measuring Range
-2.00 to 16.00 pH
Resolution 0.01 pH
Accuracy ± 0.01 pH
(b) mV
mV Measuring Range -1000 to 1000 mV
Resolution 1 mV
Accuracy ± 1 mV
(b) mV percentage
Percentage mV Measuring Range 0 to 100% (for -100 to 100 mV)
Resolution 0.1%
Accuracy ± 0.2 % (or ± 1 mV)
(c) Temperature
Temperature measuring range
-10.0 to +110.0
o
C or +14.0 to +230.0
o
F for NTC300
Resolution 0.1
o
C or
0.1
o
F
Relative accuracy 0.5
o
C or
1.0
o
F
Sensor NTC 300 (2 wire)
Compensation Automatic (± 10 ˚C/ ± 18 ˚F offset adjustment) or Manual
8.2 Set-point and control function – Relay 1 & Relay 2
Function Switchable
- Selection in Control (CNTR) function of Setup Off
Limit Control
P/PI Control (Pulse length / Pulse frequency)
(a) Off
The control function of the controller is off
SP1 & SP2 function will not appear in setup when Off is
selected in CNTR function to off mode
(b) Limit Control & P/PI Control
Relay contact selection for active mode
Energise (EN) or
De-energise (DEEN)
Set Point 1 (SP1) -2.00 to 16.00 pH or 0 to 100% or -1000 to 1000mV
Set Point 2 (SP2) -2.00 to 16.00 pH or 0 to 100% or -1000 to 1000mV
Active mode selection (for SP1 & SP2) LO (Relay is active when measured value < set point)
HI (Relay is active when measured value > set point)
Hysteresis (for SP1 & SP2) 0.1 to 1 pH or 1 to 10.0%/ 10 to 100 mV
On (pickup) Delay (for SP1 & SP2) 0 to 2000 seconds
Off (Dropout) Delay (for SP1 & SP2) 0 to 2000 seconds
(c) P/PI Control only
Proportional Range
10 to 500 %
Integral Action Time (IAT) 0.0 to 999.9 minutes
(c) (1) Pulse Length Control (PLC)
Pulse Length 0.5 to 20.0 seconds
(c) (2) Pulse Frequency Control (PFC)
Pulse Frequency 60 to 120 pulses / minutes
Contact Outputs Two SPST relays
Switching Voltage / Current / Power Max 250VAC / Max 3A / Max 600VA
8.3 Wash Function – Wash Relay
Relay contact selection for active mode Energise (EN) or
De-energise (DEEN)
Wash Cycle Interval 0.1 to 200.0 hours
Wash Duration 1 to 2000 seconds
Contact Outputs One SPST relay
Switching Voltage / Current / Power Max 250VAC / Max 3A / Max 600VA
- 30 -