Yokogawa EXAxt PH450 4-Wire Analyzer for pH and ORP - Manual (Page 10)

2
IM 12B07C05-01E
2. GENERAL SPECIFICATIONS OF EXAxt PH450G
A) Inputs specs : Dual high impedance input (≥ 10 12 Ω)
(under referance conditions)
B) Input ranges
pH : -2 to 16 pH
ORP : -1500 to 1500 mV
rH : 0 to 100 rH
Temperature
- Pt1000 : -30 to 140ºC
- Pt100 : -30 to 140ºC
- 350Ω (DKK) : -30 to 140ºC
- 5k1 : -30 to 140ºC
- 6k8 : -30 to 140ºC
- PTC10k : -30 to 140ºC
- NTC 8k55 : -10 to 120ºC
- 3kBalco : -30 to 140ºC
C) Accuracy
pH input : ≤ 0.01 pH
ORP input : ≤ 1 mV
Temperature : ≤ 0.3 ºC (≤ 0.4 ºC for Pt100)
Step response : < 4 sec for 90% (pH 7 - pH 4)
Note on performance specifications
The following tolerance is added to above performance.
mA output tolerance: ±0.02 mA of “4-20 mA“
D) Transmission signals
General : Two isolated outputs of 4-20 mA. DC with common negative. Maximum
load 600Ω. Bi-directional HART ® digital communication, superimposed
on mA1 (4-20 mA) signal
Output functions : Linear or Non linear (21-step table) output for pH, temperature, ORP or rH
Control function : PID control
Burnout function : Burn up (21.0 mA) or burn down (3.6 mA) to signal failure acc.
NAMUR NE43
Adjustable damping. Expire time
Hold : The mA-outputs are frozen to the last/fixed value during calibration/
commissioning
E) Contact outputs
General : Four SPDT relay contacts with display indicators
Switch capacity : Maximum values 100 VA, 250 VAC, 5 Amps.(*)
Maximum values 50 Watts, 250 VDC, 5 Amps.(*)
Status : High/Low process alarms, selected from pH, ORP, rH and temperature
Configurable delay time and hysteresis
Failure annunciation
Control function : On/Off, PID duty cycle or pulsed frequency control
Wash : Contact can be used to start manual- or interval time wash cycles
Hold : Contact can be used to signal the Hold situation.
Fail : Contact S4 is programmed as fail-safe contact
(*) Note: When contact output current is more than 4 Amps. ambient temperature should be
less than 40ºC.