Setting the Photocell (Photocell only affects the ‘Live Out’ output)
1.
If the lights are not already on, switch them on manually by pressing ‘Utilities/User Remote/Lu/OK’
[HP2000], or ‘Up’ [HP10] or ‘On’ [HP18]. Fluorescent lights do not reach full output until up to 15 minutes after being
switched on, so ensure that the lights are fully warmed up before continuing. This stage may be omitted if the
intention is to operate the detector’s photocell in Passive Mode only [the detector must have already been
programmed to Passive Mode].
2.
Wait until the time of day when the natural light level is at the point below which you
would
want the lights to be on, and
above which you
would not
want the lights to be on.
3. Start the internal self-programming mechanism by pressing ‘Utilities/Set Light Level/OK’ [HP2000], or ‘Store’ [HP10]
or ‘Set’ [HP18]. The detector takes a measurement, adds a small amount and stores the value in the Upper
Threshold. Then it turns the lights off, makes another measurement and stores the value in the Lower Threshold.
The lights now switch on again to acknowledge a successful programming operation.
The two switching thresholds have now been set, and the difference between them is equal to the contribution made by
the electric lighting; this is the perfect amount of hysteresis to ensure that the lights will not oscillate. The thresholds may
be read back and fine-tuned if necessary using the HP2000. Please note that the values are non-specific units i.e. not lux.
Note:
The light level perceived by the detector at the moment immediately prior to a Download operation [HP2000 only] is
shown momentarily on the HP2000 screen following the Download; this is a useful mechanism for troubleshooting.
Washroom Mode
The unit may be used in conjunction with a 230V solenoid valve and a trickle valve or ‘petcock’ to effect a urinal flush
system. Set the water flow rate by adjusting the petcock so that the cistern
just
fills within the chosen Off Delay period of
the detector. Note that in this mode, the photocell should be disabled, unless using the dual output unit.
Note:
The MS1201PF/PSM and MS1221PF/PSM and 230V solenoid valve can be ordered as a complete product, Ex-Or
part nos. UC1201PF/PSM and UC1221PF/PSM.
Lights ON =
Lights OFF =
Upper Threshold
Lower Threshold
Natural
Light
Level
Duration of
Off Delay
Note that when the natural light
level exceeds the ‘upper threshold’
value, the lights do not immediately
turn off. They will turn off only when
the upper threshold has been
exceeded for the duration of the
programmed Off Delay.
Active Mode
Passive Mode
Occupancy
Area Occupied =
Area Unoccupied =
Technical Data
OPERATING VOLTAGE: 230V 50Hz (UK & Europe)
RECOMMENDED CIRCUIT PROTECTION: 10 Amps
2
TERMINAL CAPACITY: 2 x 2.5mm
MAXIMUM LOAD: 6 Amps per output [not exceeding 10A in total]
MAXIMUM RECOMMENDED MOUNTING HEIGHT: 3 metres
RANGE: Cone-shaped detection
pattern, diameter (at floor level)
= 2.4 x mounting height
PHOTOCELL: Adjustable 50-5000 lux via HP2000/HP10/HP18
OFF DELAY 1 & 2: Adjustable via Programmer - factory pre-set to 20 mins
Options: 1 min - 96 hours / Disabled via HP2000; 5-35 mins via HP10 (also 5, 10 or 20 mins via HP18 -
MS1201PF/SM only) plus 10-second Walk-test Mode
On MS1221PF/SM each output is independently adjustable (via HP2000 or HP10)
COLOUR: White
MATERIAL: Flame retardant PC/ABS
WEIGHT: 200g approx
IP RATING: 3X
Dimensions
100mm
10mm deep
(Flange)
62mm
deep
(behind ceiling)
6.0m
2.5m
